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Open Video Call for MacOS (Swift)

This tutorial describes how to add video chat to your MacOS applications using Swift and the Agora Video SDK.

With this sample app, you can:

Prerequisites

  • Xcode 8.0+

Quick Start

This section shows you how to prepare, build, and run the sample application.

Create an Account and Obtain an App ID

To build and run the sample application, you must obtain an app ID:

  1. Create a developer account at agora.io. Once you finish the sign-up process, you are redirected to the dashboard.
  2. Navigate in the dashboard tree on the left to Projects > Project List.
  3. Copy the app ID that you obtained from the dashboard into a text file. You will use this when you launch the application.

Update and Run the Sample Application

  1. Open OpenVideoCall.xcodeproj and edit the KeyCenter.swift file. In the KeyCenter declaration, update <#Your App Id#> with your app ID.

    static let AppId: String = <#Your App Id#>

  2. Download the Agora Video SDK. Unzip the downloaded SDK package and copy the AgoraRtcEngineKit.framework file from the SDK libs folder into the sample application OpenVideoCall folder.

    agoraSDK.jpg

  3. Build and run the project. Ensure a valid provisioning profile is applied or your project will not run. Your application will look like this when it loads.

mainScreen.jpg

Steps to Create the Sample

Add Frameworks and Libraries

Under the Build Phases tab, add the following frameworks and libraries to your project:

  • SystemConfiguration.framework
  • libresolv.tbdroomview- CoreWLAN.framework`
  • CoreAudio.framework
  • CoreMedia.framework
  • AudioToolbox.framework
  • AgoraRtcEngineKit.framework
  • VideoToolbox.framework
  • AVFoundation.framework

buildPhases.jpg

Design the User Interface

Add Assets

Add the following assets to Assets.xcassets.

Note: Use Xcode to import assets to Assets.xcassets. PDF files are used for these assets, which contain images for each iOS screen resolution.

assets.jpg

Asset Description
btn_endcall An image of a red telephone for the hang up button
btn_filter and btn_filter_blue Images of glasses for filtering
btn_message and btn_message_blue Images of chat bubbles to initiate a call
btn_mute and btn_mute_blue Images of a microphone to mute/unmute audio
btn_screen_sharing and btn_screen_sharing_blue Images of an arrow to start/stop screen sharing
btn_setting An image of a cog to open the settings window
btn_video An image of a camera to start video
btn_voice An image of an arrow with sound lines, indicating that audio chat is enabled
icon_sharing_desktop Image of a monitor to share the desktop

Create the MainViewController UI

Create the layout for the MainViewController.

Note: This layout includes navigation segues to move from screen to screen.

mainViewController.jpg

When the application publishes, the MainViewController UI will look like this:

mainScreen.jpg

Create the RoomViewController UI and the ChatMessageViewController UI

Create the layout for the RoomViewController and ChatMessageViewController. The ChatMessageViewController view is embedded in the RoomViewController view.

Note: This RoomViewController layout includes popover and embed segues to display additional UI for the view.

roomViewController.jpg

chatMessageViewController.jpg

When the application publishes, the RoomViewController UI and ChatViewController UI combine to look like this:

videoCallScreen.jpg

Create the DevicesViewController UI

Create the layout for the DevicesViewController .

devicesViewController.jpg

When the application publishes, the DevicesViewController UI will look like this:

testScreen.jpg

Create the SettingsViewController UI

Create the layout for the SettingsViewController.

settingsViewController.jpg

When the application publishes, the SettingsViewController UI will look like this:

settingsScreen.jpg

Create the MainViewController Class

MainViewController.swift defines and connects application functionality with the MainViewController UI.

Define Global Variables

The MainViewController class has six IBOutlet variables. These map to the MainViewController UI elements.

Variable Description
roomInputTextField Maps to the Channel name NSTextField in the MainViewController layout
encryptionTextField Maps to the Encryption key NSTextField in the MainViewController layout
encryptionPopUpButton Maps to the AES 128 NSPopUpButton in the MainViewController layout
testButton Maps to the Test NSButton in the MainViewController layout
joinButton Maps to the Join NSButton in the MainViewController layout
settingsButton Maps to the Settings NSButton in the MainViewController layout 
import Cocoa

class MainViewController: NSViewController {
    
    @IBOutlet weak var roomInputTextField: NSTextField!
    @IBOutlet weak var encryptionTextField: NSTextField!
    @IBOutlet weak var encryptionPopUpButton: NSPopUpButton!
    @IBOutlet weak var testButton: NSButton!
    @IBOutlet weak var joinButton: NSButton!
    @IBOutlet weak var settingsButton: NSButton!
    
    ...
}

The MainViewController class has one public variable and two private variables.

  • The videoProfile variable is initialized with the default Agora video profile using AgoraVideoProfile.defaultProfile().
  • The agoraKit private variable is declared as an AgoraRtcEngineKit object and represents the Agora RTC engine.
  • The encryptionType private variable is initialized to EncryptionType.xts128.
    var videoProfile = AgoraVideoProfile.defaultProfile()
    fileprivate var agoraKit: AgoraRtcEngineKit!
    fileprivate var encryptionType = EncryptionType.xts128

Override the Base Superclass Methods

The viewDidLoad() method initializes the MainViewController:

  1. Set the view's wantsLayer property to true.
  2. Set the view layer's backgroundColor color to NSColor.white.cgColor.
  3. Load the Agora RTC engine SDK using loadAgoraKit().
  4. Load the encryption settings using loadEncryptionItems().
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.wantsLayer = true
        view.layer?.backgroundColor = NSColor.white.cgColor
        
        loadAgoraKit()
        loadEncryptionItems()
    }

The viewDidAppear() method is triggered when the view appears on the screen.

Set the keyboard focus to the room's text input field using roomInputTextField.becomeFirstResponder().

    override func viewDidAppear() {
        super.viewDidAppear()
        roomInputTextField.becomeFirstResponder()
    }

Override the prepare() Segue Method

Override the prepare() segue method to manage the application navigation.

    override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
        guard let segueId = segue.identifier , !segueId.isEmpty else {
            return
        }
        
        ...
        
    }

If the segueId is roomVCToSettingsVC, prepare the settings view through the segue destination SettingsViewController:

  • Set settingsVC.videoProfile to the current videoProfile.
  • Set settingsVC.delegate to self.
        if segueId == "roomVCToSettingsVC" {
            let settingsVC = segue.destinationController as! SettingsViewController
            settingsVC.videoProfile = videoProfile
            settingsVC.delegate = self
        }

If the segueId is roomNameVCToVideoVC, prepare the room view through the segue destination RoomViewController:

  • Set roomVC.roomName to sender.
  • Set roomVC.encryptionSecret to the text entered in the encryptionTextField.
  • Set roomVC.encryptionType to the current encryptionType.
  • Set roomVC.videoProfile to the current videoProfile.
  • Set roomVC.delegate to self.
        else if segueId == "roomNameVCToVideoVC" {
            let videoVC = segue.destinationController as! RoomViewController
            if let sender = sender as? String {
                videoVC.roomName = sender
            }
            videoVC.encryptionSecret = encryptionTextField.stringValue
            videoVC.encryptionType = encryptionType
            videoVC.videoProfile = videoProfile
            videoVC.delegate = self
        }

If the segueId is roomVCToDevicesVC, prepare the devices view through the segue destination DevicesViewController:

  • Set devicesVC.agoraKit to agoraKit.
  • Set devicesVC.couldTest to true.
        else if segueId == "roomVCToDevicesVC" {
            let devicesVC = segue.destinationController as! DevicesViewController
            devicesVC.agoraKit = agoraKit
            devicesVC.couldTest = true
        }

Create the IBAction Methods

The Encryption dropdown menu in the MainViewController layout invokes the doEncryptionChanged() IBAction method. This method sets the encryptionType value to the selected index of EncryptionType.allValue.

    @IBAction func doEncryptionChanged(_ sender: NSPopUpButton) {
        encryptionType = EncryptionType.allValue[sender.indexOfSelectedItem]
    }

The Test UI Button in the MainViewController layout invokes the doTestClicked() IBAction method. This method opens the Devices View using performSegue().

    @IBAction func doTestClicked(_ sender: NSButton) {
        performSegue(withIdentifier: "roomVCToDevicesVC", sender: nil)
    }

The Join UI Button in the MainViewController layout invokes the doJoinClicked() IBAction method. This method enters the user into the room specified by roomInputTextField using enter().

    @IBAction func doJoinClicked(_ sender: NSButton) {
        enter(roomName: roomInputTextField.stringValue)
    }

The Settings UI Button in the MainViewController layout invokes the doSettingsClicked() IBAction method. This method opens the Settings View using performSegue().

    @IBAction func doSettingsClicked(_ sender: NSButton) {
        performSegue(withIdentifier: "roomVCToSettingsVC", sender: nil)
    }

Create the MainViewController Class Extension

The MainViewController extension contains methods to load the Agora RTC engine and manage UI navigation.

private extension MainViewController {

	...
	
}

The loadAgoraKit() method intializes the Agora RTC engine.

Enable/Disable Video

Create agoraKit with the KeyCenter.AppId using AgoraRtcEngineKit.sharedEngine() and enable video using agoraKit.enableVideo().

    func loadAgoraKit() {
        agoraKit = AgoraRtcEngineKit.sharedEngine(withAppId: KeyCenter.AppId, delegate: self)
        agoraKit.enableVideo()
    }

The loadEncryptionItems method populates the encryption type UI dropdown menu using encryptionPopUpButton.addItems().

Initialize the selection with encryptionType.description() using encryptionPopUpButton.selectItem().

    func loadEncryptionItems() {
        encryptionPopUpButton.addItems(withTitles: EncryptionType.allValue.map { type -> String in
            return type.description()
        })
        encryptionPopUpButton.selectItem(withTitle: encryptionType.description())
    }

The enter() method enters the user into the channel with the name roomName.

Ensure roomName is valid before navigating from the main view to the room view by applying the identifier roomNameVCToVideoVC to performSegue().

    func enter(roomName: String?) {
        guard let roomName = roomName , !roomName.isEmpty else {
            return
        }
        
        performSegue(withIdentifier: "roomNameVCToVideoVC", sender: roomName)
    }

Create MainViewController Delegates

The MainViewController delegates implement the required and optional methods for the Agora SDK, UI components, and navigation to/from other views.

Create the SettingsVCDelegate

The settingsVC method is a delegate method for the SettingsVCDelegate.

This method is invoked when the video profile for the SettingsViewController changes. It updates the videoProfile with profile, and sets settingsVC.view.window?.contentViewController to self.

extension MainViewController: SettingsVCDelegate {
    func settingsVC(_ settingsVC: SettingsViewController, closeWithProfile profile: AgoraVideoProfile) {
        videoProfile = profile
        settingsVC.view.window?.contentViewController = self
    }
}

Create the RoomVCDelegate

The roomVCNeedClose method is a delegate method for the RoomVCDelegate. This method is invoked when the user leaves the room.

Do one of the following:

  • If window is valid, apply the remaining code.
  • If window is invalid, invoke return.
extension MainViewController: RoomVCDelegate {
    func roomVCNeedClose(_ roomVC: RoomViewController) {
        guard let window = roomVC.view.window else {
            return
        }
        
        ...

    }
}
  1. Invoke window.toggleFullScreen() if the window's masking style has a .fullScreen option.
  2. Add two additional options .fullSizeContentView and .miniaturizable to the window's masking style array using window.styleMask.insert().
  3. Set the window's delegate to nil.
  4. Initialize the window's collection behavior using NSWindowCollectionBehavior().
        if window.styleMask.contains(.fullScreen) {
            window.toggleFullScreen(nil)
        }
        
        window.styleMask.insert([.fullSizeContentView, .miniaturizable])
        window.delegate = nil
        window.collectionBehavior = NSWindowCollectionBehavior()

Set the content view controller to self and set the window to a fixed aspect ratio.

  1. Create a local variable size using CGSize().
  2. Set the minSize and the maxSize to size and set the current size by using window.setContentSize(),
        window.contentViewController = self
        
        let size = CGSize(width: 720, height: 600)
        window.minSize = size
        window.setContentSize(size)
        window.maxSize = size

Create the AgoraRtcEngineDelegate

The AgoraRtcEngineDelegate defines the required callback methods for the Agora SDK.

extension MainViewController: AgoraRtcEngineDelegate {

	...

}

The reportAudioVolumeIndicationOfSpeakers callback is triggered when the speaker volume indicators change.

Set a name for the VolumeChangeNotificationKey notification and the value for the totalVolume using NotificationCenter.default.post().

    func rtcEngine(_ engine: AgoraRtcEngineKit, reportAudioVolumeIndicationOfSpeakers speakers: [AgoraRtcAudioVolumeInfo], totalVolume: Int) {
        NotificationCenter.default.post(name: Notification.Name(rawValue: VolumeChangeNotificationKey), object: NSNumber(value: totalVolume as Int))
    }

The device callback is triggered when the user's device is changed.

Set a name for the DeviceListChangeNotificationKey notification and the value for the deviceType using NotificationCenter.default.post().

    func rtcEngine(_ engine: AgoraRtcEngineKit, device deviceId: String, type deviceType: AgoraMediaDeviceType, stateChanged state: Int) {
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: DeviceListChangeNotificationKey), object: NSNumber(value: deviceType.rawValue))
    }

Create the NSControlTextEditingDelegate

The controlTextDidChange() method is triggered when the text input field is being edited.

Before formatting the string input, ensure that the field is valid .

  1. Format the field's string value using MediaCharacter.updateToLegalMediaString().
  2. Set field.stringValue to legalString, which replaces the field's text with the newly formatted text.
extension MainViewController: NSControlTextEditingDelegate {
    override func controlTextDidChange(_ obj: Notification) {
        guard let field = obj.object as? NSTextField else {
            return
        }
        
        let legalString = MediaCharacter.updateToLegalMediaString(from: field.stringValue)
        field.stringValue = legalString
    }
}

Create the RoomViewController Class

RoomViewController.swift defines and connects application functionality with the RoomViewController UI.

Define the RoomVCDelegate Protocol

The roomVCNeedClose() method is used for communication between the RoomViewController class and its delegate. The method tells the delegate to close the room.

import Cocoa
import Quartz.ImageKit

protocol RoomVCDelegate: class {
    func roomVCNeedClose(_ roomVC: RoomViewController)
}

Define IBOutlet Variables

The RoomViewController class has IBOutlet variables to manage buttons, view containers, and handle other UI elements. The variables map to the RoomViewController UI elements.

Variable Description
roomNameLabel Label for the room name in the header of the layout
buttonContainerView Container for the buttons
containerView Container for the videos in the room
messageTableContainerView List of messages
muteVideoButton Button to mute/unmute the video
muteAudioButton Button to mute/unmute the audio
screenSharingButton Button to share/unshare the screen
windowListView List for the windows
filterButton Button for filtering
messageButton Button for messaging
messageInputerView Container for message creation
messageTextField Text field for the message creation 
class RoomViewController: NSViewController {

    @IBOutlet weak var roomNameLabel: NSTextField!
    @IBOutlet weak var containerView: NSView!
    @IBOutlet weak var buttonContainerView: NSView!
    @IBOutlet weak var messageTableContainerView: NSView!
    
    @IBOutlet weak var muteVideoButton: NSButton!
    @IBOutlet weak var muteAudioButton: NSButton!
    
    @IBOutlet weak var screenSharingButton: NSButton!
    @IBOutlet weak var windowListView: IKImageBrowserView!
    
    @IBOutlet weak var filterButton: NSButton!
    
    @IBOutlet weak var messageButton: NSButton!
    @IBOutlet weak var messageInputerView: NSView!
    @IBOutlet weak var messageTextField: NSTextField!

    ...
    
}

The remaining code in this section is contained within the RoomViewController class declaration.

Define Global Variables

The RoomViewController class has five public variables. These variables manage the RoomViewController settings.

Variable Description
roomName The name of the room
encryptionSecret The encryption key for the room
encryptionType The encryption type for the room
videoProfile The video profile for the room
delegate The delegate for the RoomViewController class
AgoraRtcEngineKit The Agora RTC engine SDK object 
    var roomName: String!
    var encryptionSecret: String?
    var encryptionType: EncryptionType!
    var videoProfile: AgoraVideoProfile!
    var delegate: RoomVCDelegate?
    
    ...
    
    var agoraKit: AgoraRtcEngineKit!
    
    ...

Define Private Class Variables

UI Management Variables

The shouldHideFlowViews variable defaults to false. When this variable changes:

  1. Set the isHidden property of the buttonContainerView, messageTableContainerView, and roomNameLabel to the new value of shouldHideFlowViews.

  2. If the screen sharing status is .list mode, set the screenSharingStatus to .none.

  3. Manage the messageTextField and the messageInputerView based on shouldHideFlowViews.

    • If shouldHideFlowViews is true, remove the focus from the messageTextField using the resignFirstResponder() and hide the messageInputerView by setting its isHidden property to true.
    • If shouldHideFlowViews is false, set the focus to the messageTextField using the becomeFirstResponder() and show the messageInputerView by setting its isHidden property to false.
    fileprivate var shouldHideFlowViews = false {
        didSet {
            buttonContainerView?.isHidden = shouldHideFlowViews
            messageTableContainerView?.isHidden = shouldHideFlowViews
            roomNameLabel?.isHidden = shouldHideFlowViews
            
            if screenSharingStatus == .list {
                screenSharingStatus = .none
            }
            
            if shouldHideFlowViews {
                messageTextField?.resignFirstResponder()
                messageInputerView?.isHidden = true
            } else {
                buttonContainerView?.isHidden = false
                if isInputing {
                    messageTextField?.becomeFirstResponder()
                    messageInputerView?.isHidden = false
                }
            }
        }
    }

The shouldCompressSelfView variable defaults to false. When this variable changes, invoke the updateSelfViewVisiable() method.

    fileprivate var shouldCompressSelfView = false {
        didSet {
            updateSelfViewVisiable()
        }
    }
Video Session Variables

The videoSessions and doubleClickFullSession variables handle the video sessions for the room.

Initialize videoSessions to an empty array. When videoSessions is set, update the interface with the video sessions using updateInterface().

    fileprivate var videoSessions = [VideoSession]() {
        didSet {
            updateInterface(with: videoSessions)
        }
    }

Initialize doubleClickEnabled to false.

When doubleClickFullSession is set, update the interface with the video sessions using updateInterface() if the number of sessions is 3 or more, and the interface has not already been updated (to avoid duplication).

Initialize the videoViewLayout using the VideoViewLayout().

The dataChannelId is set to -1 by default and manages the room channel.

    fileprivate var doubleClickEnabled = false
    fileprivate var doubleClickFullSession: VideoSession? {
        didSet {
            if videoSessions.count >= 3 && doubleClickFullSession != oldValue {
                updateInterface(with: videoSessions)
            }
        }
    }
    fileprivate let videoViewLayout = VideoViewLayout()
    fileprivate var dataChannelId: Int = -1
Audio and Video Control Variables

The audioMuted and videoMuted variables are set to false by default, and manage the audio and video streams, respectively.

When audioMuted is set, the muteAudioButton image is updated, and the audio stream is muted/unmuted using agoraKit.muteLocalAudioStream().

    fileprivate var audioMuted = false {
        didSet {
            muteAudioButton?.image = NSImage(named: audioMuted ? "btn_mute_blue" : "btn_mute")
            agoraKit.muteLocalAudioStream(audioMuted)
        }
    }

When videoMuted is set:

  • The muteVideoButton image is updated.
  • The video stream is stopped/started using agoraKit.muteLocalVideoStream() and setVideoMuted().
  • The video view of the current user is set to hidden/not hidden using updateSelfViewVisiable().
    fileprivate var videoMuted = false {
        didSet {
            muteVideoButton?.image = NSImage(named: videoMuted ? "btn_video" : "btn_voice")
            
            agoraKit.muteLocalVideoStream(videoMuted)
            setVideoMuted(videoMuted, forUid: 0)
            
            updateSelfViewVisiable()
        }
    }
Screen Sharing Control Variables

The ScreenSharingStatus enumerates values for none, list, and sharing.

The nextStatus() method toggles between active and non-active status states.

  • If the current value is .none, return .list.
  • If the current value is .list, return .none.
  • If the current value is .sharing, return .none.
    enum ScreenSharingStatus {
        case none, list, sharing
        
        func nextStatus() -> ScreenSharingStatus {
            switch self {
            case .none: return .list
            case .list: return .none
            case .sharing: return .none
            }
        }
    }

The screenSharingStatus variable is set to ScreenSharingStatus.none by default, and manages the current status of the screen share.

When the screenSharingButton is set:

  • The screenSharingButton image is updated.
  • If the old value is .sharing, the screen share stops stopShareWindow().
  • if screenSharingStatus is equal to .list, the window list is shown/hidden.

The windows variable is initialized using WindowList().

    fileprivate var screenSharingStatus = ScreenSharingStatus.none {
        didSet {
            screenSharingButton?.image = NSImage(named: (screenSharingStatus == .sharing) ? "btn_screen_sharing_blue" : "btn_screen_sharing")
            
            if oldValue == .sharing {
                stopShareWindow()
            }
            
            showWindowList(screenSharingStatus == .list)
        }
    }
    fileprivate var windows = WindowList()
Filtering Control Variable

The isFiltering variable is set to false by default. When this variable is set:

  • The creation of agoraKit is verified.
  • If filtering is enabled, set the video preprocessing using AGVideoPreProcessing.registerVideoPreprocessing() and update the filterButton with the blue image.
  • If filtering is not enabled, unregister the video preprocessing using AGVideoPreProcessing.deregisterVideoPreprocessing() and update the filterButton with the white image.
    fileprivate var isFiltering = false {
        didSet {
            guard let agoraKit = agoraKit else {
                return
            }
            
            if isFiltering {
                AGVideoPreProcessing.registerVideoPreprocessing(agoraKit)
                filterButton?.image = NSImage(named: "btn_filter_blue")
            } else {
                AGVideoPreProcessing.deregisterVideoPreprocessing(agoraKit)
                filterButton?.image = NSImage(named: "btn_filter")
            }
        }
    }
Chat Message Control Variables

The chatMessageVC variable manages the chat message list.

The isInputing variable is set to false as the default. When this is set:

  • Based on the current value of isInputing

    • The messageTextField is activated/deactivated using becomeFirstResponder()/resignFirstResponder().
    • The messageInputerView is hidden/unhidden.

  • ThemessageButton image is updated using messageButton?.setImage().

    fileprivate var chatMessageVC: ChatMessageViewController?
    fileprivate var isInputing = false {
        didSet {
            if isInputing {
                messageTextField?.becomeFirstResponder()
            } else {
                messageTextField?.resignFirstResponder()
            }
            messageInputerView?.isHidden = !isInputing
            messageButton?.image = NSImage(named: isInputing ? "btn_message_blue" : "btn_message")
        }
    }

Create Superclass Methods

Create the View Methods

The viewDidLoad() method initializes the RoomViewController:

  1. Set the roomNameLabel text to roomName.
  2. Set messageInputerView.wantsLayer to true.
  3. Set the messageInputerView layer background color to semi-transparent black and set the cornerRadius property to 2.
  4. Invoke setupWindowListView().
  5. Load the Agora RTC engine SDK using loadAgoraKit().
    override func viewDidLoad() {
        super.viewDidLoad()
        roomNameLabel.stringValue = roomName
        
        messageInputerView.wantsLayer = true
        messageInputerView.layer?.backgroundColor = NSColor(hex: 0x000000, alpha: 0.75).cgColor
        messageInputerView.layer?.cornerRadius = 2
        
        setupWindowListView()
        loadAgoraKit()
    }

The viewDidAppear() method is triggered when the view appears on the screen. Set the view's window configuration style using configStyle().

    override func viewDidAppear() {
        super.viewDidAppear()
        configStyle(of: view.window!)
    }
Create the prepare() Method

The prepare() segue method manages the navigation for the RoomViewController. If the segueId is VideoVCEmbedChatMessageVC, set chatMessageVC to the ChatMessageViewController; otherwise do nothing.

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        guard let segueId = segue.identifier else {
            return
        }
        
        switch segueId {
        case "VideoVCEmbedChatMessageVC":
            chatMessageVC = segue.destination as? ChatMessageViewController
        default:
            break
        }
    }
Create the Image Browser Methods

The methods in this section manage the methods for the IKImageBrowserView class.

extension RoomViewController {
	
	...
	
}

The numberOfItems method returns the number of items for the image browser. Return the value of windows.items.count.

    override func numberOfItems(inImageBrowser aBrowser: IKImageBrowserView!) -> Int {
        return windows.items.count
    }

The itemAt method returns the item at the specified index for the image browser. Return the value of windows.items[index].

    override func imageBrowser(_ aBrowser: IKImageBrowserView!, itemAt index: Int) -> Any! {
        let item = windows.items[index]
        return item
    }

The cellWasDoubleClickedAt method is triggered when a cell in the image browser is double-clicked.

If aBrowser has no selected index or the index is less than windows.items.count, invoke return.

Otherwise, use the index to retrieve the window from windows.items and start sharing the window using startShareWindow() and set screenSharingStatus to .sharing.

    override func imageBrowser(_ aBrowser: IKImageBrowserView!, cellWasDoubleClickedAt index: Int) {
        guard let selected = aBrowser.selectionIndexes() else {
            return
        }
        
        let index = selected.first
        guard index! < windows.items.count else {
            return
        }
        
        let window = windows.items[index!].window
        startShareWindow(window!)
        screenSharingStatus = .sharing
    }

Create IBAction Methods

These IBAction methods map to the UI elements for the RoomViewController:

Message Methods

The doMessageClicked() method is invoked by the messageButton UI button and updates isInputing.

The doMessageInput() method is invoked by the messageTextField UI text field. If the text field is not empty:

  • Send the text using send().
  • Clear the text field by setting the stringValue property to an empty string.
    @IBAction func doMessageClicked(_ sender: NSButton) {
        isInputing = !isInputing
    }
    
    ...
    
    @IBAction func doMessageInput(_ sender: NSTextField) {
        let text = sender.stringValue
        if !text.isEmpty {
            send(text: text)
            sender.stringValue = ""
        }
    }
Mute/Unmute Video and Audio Methods

The doMuteVideoClicked() method is invoked by the muteVideoButton UI button and updates videoMuted.

The doMuteAudioClicked() method is invoked by the muteAudioButton UI button and updates audioMuted.

    @IBAction func doMuteVideoClicked(_ sender: NSButton) {
        videoMuted = !videoMuted
    }
    
    @IBAction func doMuteAudioClicked(_ sender: NSButton) {
        audioMuted = !audioMuted
    }
Screen Share and Filter Methods

The doShareScreenClicked() method is invoked by the screenSharingButton UI button and updates screenSharingStatus to the value of screenSharingStatus.nextStatus().

The doFilterClicked() method is invoked by the filterButton UI button action and updates isFiltering.

    @IBAction func doShareScreenClicked(_ sender: NSButton) {
        screenSharingStatus = screenSharingStatus.nextStatus()
    }
    
    @IBAction func doFilterClicked(_ sender: NSButton) {
        isFiltering = !isFiltering
    }

Create Private and Public Methods

The private methods for the RoomViewController are created as functions in a private extension.

private extension RoomViewController {

	...
	
}
Create the configStyle() Method

They configStyle() method sets the style of the application window.

  1. Set the window delegate to self.
  2. Set the window's collectionBehavior property to an array containing .fullScreenPrimary.
  3. Set the window minimum, maximum, and current size:
    • Set the window's minimum size to 960 x 600 using CGSize().
    • Set the window's maximum size to the largest value possible using CGFloat.greatestFiniteMagnitude and CGSize().
    • Set the current size to minSize using window.setContentSize().
    func configStyle(of window: NSWindow) {
        window.styleMask.insert([.fullSizeContentView, .miniaturizable])
        window.delegate = self
        window.collectionBehavior = [.fullScreenPrimary]
        
        let minSize = CGSize(width: 960, height: 600)
        window.minSize = minSize
        window.maxSize = CGSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude)
        window.setContentSize(minSize)
    }
Create the updateInterface Method

The updateInterface() method handles layout updates for the video session.

Do one of the following:

  • If sessions is not empty, continue with the remaining code.
  • If sessions is empty, invoke return.
    func updateInterface(with sessions: [VideoSession]) {
        guard !sessions.isEmpty else {
            return
        }
        
        ...
        
    }

Update the videoViewLayout properties:

  • Initialize a local variable selfSession to sessions.first.
  • Set the selfView property to selfSession.hostingView.
  • Set the selfSize property to selfSession.size.
  • Initialize a local variable peerVideoViews to an empty array.
  • For each session in sessions, append the sessio.n's hostingView.
  • Set the videoViews property to peerVideoViews
  • Set the fullView property to doubleClickFullSession?.hostingView.
  • Set the containerView property to containerView.

Update the video views using videoViewLayout.layoutVideoViews().

        let selfSession = sessions.first!
        videoViewLayout.selfView = selfSession.hostingView
        videoViewLayout.selfSize = selfSession.size
        var peerVideoViews = [VideoView]()
        for i in 1..<sessions.count {
            peerVideoViews.append(sessions[i].hostingView)
        }
        videoViewLayout.videoViews = peerVideoViews
        videoViewLayout.fullView = doubleClickFullSession?.hostingView
        videoViewLayout.containerView = containerView
        
        videoViewLayout.layoutVideoViews()

Invoke updateSelfViewVisiable().

If the number of sessions is greater than or equal to 3, set doubleClickEnabled to true. Otherwise, set doubleClickEnabled to false and doubleClickFullSession to nil.

        updateSelfViewVisiable()
        
        if sessions.count >= 3 {
            doubleClickEnabled = true
        } else {
            doubleClickEnabled = false
            doubleClickFullSession = nil
        }
Create Session Methods

The fetchSession() method returns the VideoSession for a specified user. Loop through videoSessions until the session.uid matches the uid.

    func fetchSession(of uid: UInt) -> VideoSession? {
        for session in videoSessions {
            if session.uid == uid {
                return session
            }
        }
        
        return nil
    }

The videoSession() method returns the VideoSession for the user.

The difference between this method and the fetchSession() method is that if no fetchSession() exists a new VideoSession object is created and appended to videoSessions.

    func videoSession(of uid: UInt) -> VideoSession {
        if let fetchedSession = fetchSession(of: uid) {
            return fetchedSession
        } else {
            let newSession = VideoSession(uid: uid)
            videoSessions.append(newSession)
            return newSession
        }
    }

The setVideoMuted() method starts/stops the video for a specified user. The VideoSession is retrieved using fetchSession() to apply muted to the isVideoMuted property.

    func setVideoMuted(_ muted: Bool, forUid uid: UInt) {
        fetchSession(of: uid)?.isVideoMuted = muted
    }
Create the UI Control Methods

The updateSelfViewVisiable() method sets the user view to hidden/not hidden. If the number of videoSessions is 2, determine if the view is hidden using videoMuted and shouldCompressSelfView. Otherwise, hide the view.

    func updateSelfViewVisiable() {
        guard let selfView = videoSessions.first?.hostingView else {
            return
        }
        
        if videoSessions.count == 2 {
            selfView.isHidden = (videoMuted || shouldCompressSelfView)
            
        } else {
            selfView.isHidden = false
        }
    }

The setupWindowListView() method updates the windowListView:

  • Allow the width to be resizable using windowListView.setContentResizingMask().
  • Set IKImageBrowserBackgroundColorKey to semi-transparent white using windowListView.setValue().
  • Set the IKImageBrowserCellsTitleAttributesKey:
    1. Retrieve the old attributes value using the windowListView.value().
    2. Create a new local variable attributres using oldAttributres.mutableCopy().
    3. Set the NSForegroundColorAttributeName of attributres to white using attributres.setObject().
    4. Set the title attributes using windowListView.setValue().
    func setupWindowListView() {
        windowListView.setContentResizingMask(Int(NSAutoresizingMaskOptions.viewWidthSizable.rawValue))
        windowListView.setValue(NSColor(white: 0, alpha: 0.75), forKey:IKImageBrowserBackgroundColorKey)
        
        let oldAttributres = windowListView.value(forKey: IKImageBrowserCellsTitleAttributesKey) as! NSDictionary
        let attributres = oldAttributres.mutableCopy() as! NSMutableDictionary
        attributres.setObject(NSColor.white, forKey: NSForegroundColorAttributeName as NSCopying)
        windowListView.setValue(attributres, forKey:IKImageBrowserCellsTitleAttributesKey)
    }

The showWindowList() method shows/hides the windowListView.

If shouldShow is true:

  1. Invoke windows.getList() and windowListView?.reloadData() to update and reload the list data.
  2. Show the windowListView by setting the isHidden property to false.

If shouldShow is false, hide the windowListView by setting the isHidden property to true.

    func showWindowList(_ shouldShow: Bool) {
        if shouldShow {
            windows.getList()
            windowListView?.reloadData()
            windowListView?.isHidden = false
        } else {
            windowListView?.isHidden = true
        }
    }

The alert() method appends an alert message to the chat message box using chatMessageVC?.append().

    func alert(string: String) {
        guard !string.isEmpty else {
            return
        }
        chatMessageVC?.append(alert: string)
    }

The windowShouldClose() is a public method required by NSWindowDelegate and is triggered before the window closes.

Invoke leaveChannel() and return false.

extension RoomViewController: NSWindowDelegate {
    func windowShouldClose(_ sender: Any) -> Bool {
        leaveChannel()
        return false
    }
}

Create RoomViewController Agora Methods and Delegates

The methods applying the Agora SDK are placed within a private extension for the RoomViewController.

private extension RoomViewController {
	...
}

Create the loadAgoraKit() Method

The loadAgoraKit() method initializes the Agora RTC engine using AgoraRtcEngineKit.sharedEngine():

  1. Set the channel profile to .communication, enable video using agoraKit.enableVideo(), and set the videoProfile using agoraKit.setVideoProfile().

  2. Invoke addLocalSession() and start the preview using agoraKit.startPreview().

  3. If encryptionSecret is not empty, set the encryption using agoraKit.setEncryptionMode() and agoraKit.setEncryptionSecret().

  4. Join the channel roomName using agoraKit.joinChannel():

  • If the code is equal to 0, the channel join is successful. Disable the idle timer using setIdleTimerActive.
  • If the channel join is not successful, display an error message alert using self.alert().
  1. Complete the method with agoraKit.createDataStream() to create a data stream for the joined channel.
    func loadAgoraKit() {
        agoraKit = AgoraRtcEngineKit.sharedEngine(withAppId: KeyCenter.AppId, delegate: self)
        agoraKit.setChannelProfile(.communication)
        agoraKit.enableVideo()
        agoraKit.setVideoProfile(videoProfile, swapWidthAndHeight: false)
        
        addLocalSession()
        agoraKit.startPreview()
        
        if let encryptionType = encryptionType, let encryptionSecret = encryptionSecret , !encryptionSecret.isEmpty {
            agoraKit.setEncryptionMode(encryptionType.modeString())
            agoraKit.setEncryptionSecret(encryptionSecret)
        }
        let code = agoraKit.joinChannel(byToken: nil, channelId: roomName, info: nil, uid: 0, joinSuccess: nil)
        if code != 0 {
            DispatchQueue.main.async(execute: {
                self.alert(string: "Join channel failed: \(code)")
            })
        }
        
        agoraKit.createDataStream(&dataChannelId, reliable: true, ordered: true)
    }

Create the addLocalSession() Method

The addLocalSession() method appends the local video session to the videoSessions and sets up the local video view using agoraKit.setupLocalVideo().

If MediaInfo is available for the videoProfile, set the media info property for the local session using localSession.mediaInfo.

    func addLocalSession() {
        let localSession = VideoSession.localSession()
        videoSessions.append(localSession)
        agoraKit.setupLocalVideo(localSession.canvas)
        if let mediaInfo = MediaInfo(videoProfile: videoProfile) {
            localSession.mediaInfo = mediaInfo
        }
    }

Create the leaveChannel() Method

The leaveChannel() method enables the user to leave the video session.

  1. Clear the local video and leave the channel by applying nil as the parameter for agoraKit.setupLocalVideo() and agoraKit.leaveChannel().
  2. Stop the video preview using agoraKit.stopPreview() and set isFiltering to false.
  3. Loop through videoSessions and remove its hostingView from the superview using removeFromSuperview().
  4. Clear the video sessions array using videoSessions.removeAll().
  5. Complete the method by invoking the room to close using delegate?.roomVCNeedClose().
    func leaveChannel() {
        agoraKit.setupLocalVideo(nil)
        agoraKit.leaveChannel(nil)
        agoraKit.stopPreview()
        isFiltering = false
        
        for session in videoSessions {
            session.hostingView.removeFromSuperview()
        }
        videoSessions.removeAll()
        
        delegate?.roomVCNeedClose(self)
    }

Create the Screen Share Methods

The startShareWindow() method starts screen sharing.

Capture the screen specified by the windowId using agoraKit?.startScreenCapture().

Turn on screen share for the first item in the videoSessions using hostingView.switchToScreenShare() if any of the following are true:

  • windowId is equal to 0
  • window.name is equal to Agora Video Call
  • window.name is equal to Full Screen
    func startShareWindow(_ window: Window) {
        let windowId = window.id
        agoraKit?.startScreenCapture(UInt(windowId), withCaptureFreq: 15, bitRate: 0, andRect: CGRect.zero )
        videoSessions.first?.hostingView.switchToScreenShare(windowId == 0 || window.name == "Agora Video Call" || window.name == "Full Screen")
    }

The stopShareWindow() method stops screen sharing.

Stop the screen capture the screen specified by using agoraKit?.stopScreenCapture() and turn of screen share for the first item in the videoSessions using hostingView.switchToScreenShare().

    func stopShareWindow() {
        agoraKit?.stopScreenCapture()
        videoSessions.first?.hostingView.switchToScreenShare(false)
    }

Create the send() Method

The send() method sends a new message to the stream.

Ensure that the dataChannelId is greater than 0 and that the text.data is valid before applying the following:

  • Send the message to the stream using agoraKit.sendStreamMessage().
  • Append the message to the chat message view using chatMessageVC?.append().
    func send(text: String) {
        if dataChannelId > 0, let data = text.data(using: String.Encoding.utf8) {
            agoraKit.sendStreamMessage(dataChannelId, data: data)
            chatMessageVC?.append(chat: text, fromUid: 0)
        }
    }

Create the AgoraRtcEngineDelegate

The AgoraRtcEngineDelegate methods are added through an extension for the RoomViewController.

extension RoomViewController: AgoraRtcEngineDelegate {
    
    ...
    
}
Create the rtcEngine Connection Methods

The rtcEngineConnectionDidInterrupted() method displays an alert with the error message Connection Interrupted.

The rtcEngineConnectionDidLost() method displays an alert with the error message Connection Lost.

    func rtcEngineConnectionDidInterrupted(_ engine: AgoraRtcEngineKit) {
        alert(string: "Connection Interrupted")
    }
    
    func rtcEngineConnectionDidLost(_ engine: AgoraRtcEngineKit) {
        alert(string: "Connection Lost")
    }
Create the errorCode Event Listener

The didOccurError event listener is triggered when the Agora RTC engine generates an error.

Display an alert with the error code value errorCode.rawValue.

    func rtcEngine(_ engine: AgoraRtcEngineKit, didOccurError errorCode: AgoraErrorCode) {
        alert(string: "errorCode \(errorCode.rawValue)")
    }
Create the firstRemoteVideoDecodedOfUid Event Listener

The firstRemoteVideoDecodedOfUid event listener is triggered when the first remote video is decoded.

  1. Retrieve the video session of the user using the videoSession().

  2. Set the session dimensions using the userSession.size and update the media info using the userSession.updateMediaInfo().

  3. Complete the method by setting up the remote video using agoraKit.setupRemoteVideo().

    func rtcEngine(_ engine: AgoraRtcEngineKit, firstRemoteVideoDecodedOfUid uid: UInt, size: CGSize, elapsed: Int) {
        let userSession = videoSession(of: uid)
        let sie = size.fixedSize()
        userSession.size = sie
        userSession.updateMediaInfo(resolution: size)
        agoraKit.setupRemoteVideo(userSession.canvas)
    }
Create the firstLocalVideoFrameWith Event Listener

The firstLocalVideoFrameWith event listener is triggered when the first local video frame has elapsed.

Ensure that selfSession is the first item in the videoSessions before applying the following:

  • Set the dimensions of the video session using selfSession.size.
  • Update the video interface using updateInterface().
    // first local video frame
    func rtcEngine(_ engine: AgoraRtcEngineKit, firstLocalVideoFrameWith size: CGSize, elapsed: Int) {
        if let selfSession = videoSessions.first {
            selfSession.size = size.fixedSize()
            updateInterface(with: videoSessions)
        }
    }
Create the didOfflineOfUid Event Listener

The didOfflineOfUid is triggered when a user goes offline.

Loop through the videoSessions to retrieve the video session of the offline user:

  • If the video session is found, remove the session hostingView from the superview using removeFromSuperview()..
  • If the offline user session is doubleClickFullSession, set doubleClickFullSession to nil.
    // user offline
    func rtcEngine(_ engine: AgoraRtcEngineKit, didOfflineOfUid uid: UInt, reason: AgoraUserOfflineReason) {
        var indexToDelete: Int?
        for (index, session) in videoSessions.enumerated() {
            if session.uid == uid {
                indexToDelete = index
            }
        }
        
        if let indexToDelete = indexToDelete {
            let deletedSession = videoSessions.remove(at: indexToDelete)
            deletedSession.hostingView.removeFromSuperview()
            if let doubleClickFullSession = doubleClickFullSession , doubleClickFullSession == deletedSession {
                self.doubleClickFullSession = nil
            }
        }
    }
Create the didVideoMuted Event Listener

The didVideoMuted is triggered when a user turns off video.

Set the video to off using setVideoMuted().

    // video muted
    func rtcEngine(_ engine: AgoraRtcEngineKit, didVideoMuted muted: Bool, byUid uid: UInt) {
        setVideoMuted(muted, forUid: uid)
    }
Create the remoteVideoStats Event Listener

The remoteVideoStats event is triggered when a metric changes for the Agora RTC engine.

Retrieve the video session for the user using fetchSession() and update the resolution, height, and fps using session.updateMediaInfo().

    //remote stat
    func rtcEngine(_ engine: AgoraRtcEngineKit, remoteVideoStats stats: AgoraRtcRemoteVideoStats) {
        if let session = fetchSession(of: stats.uid) {
            session.updateMediaInfo(resolution: CGSize(width: CGFloat(stats.width), height: CGFloat(stats.height)), bitRate: Int(stats.receivedBitrate), fps: Int(stats.receivedFrameRate))
        }
    }
Create the Device Changed Event Listener

The device changed event listener is triggered when the device changes.

Set a device notification with the DeviceListChangeNotificationKey and the device type using the NotificationCenter.default.post().

    func rtcEngine(_ engine: AgoraRtcEngineKit, device deviceId: String, type deviceType: AgoraMediaDeviceType, stateChanged state: Int) {
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: DeviceListChangeNotificationKey), object: NSNumber(value: deviceType.rawValue))
    }
Create the receiveStreamMessageFromUid Event Listener

The receiveStreamMessageFromUid is triggered when a message is received from a user.

The method checks that the message string is not empty before appending it to the chat message view using chatMessageVC?.append().

    //data channel
    func rtcEngine(_ engine: AgoraRtcEngineKit, receiveStreamMessageFromUid uid: UInt, streamId: Int, data: Data) {
        guard let string = String(data: data, encoding: String.Encoding.utf8) , !string.isEmpty else {
            return
        }
        chatMessageVC?.append(chat: string, fromUid: Int64(uid))
    }
Create the didOccurStreamMessageErrorFromUid Event Listener

The didOccurStreamMessageErrorFromUid is triggered when a user message error occurs and then displays the error using chatMessageVC?.append().

    func rtcEngine(_ engine: AgoraRtcEngineKit, didOccurStreamMessageErrorFromUid uid: UInt, streamId: Int, error: Int, missed: Int, cached: Int) {
        chatMessageVC?.append(alert: "Data channel error: \(error)")
    }

Create the ChatMessageViewController Class

ChatMessageViewController.swift defines and connects application functionality with the ChatMessageViewController UI.

Add Global Variables and Superclass Overrides

The ChatMessageViewController defines the IBOutlet variable messageTableView, which maps to the table created in the ChatMessageViewController UI.

Initialize the private variable messageList to manage the array of messages for the chat.

import Cocoa

class ChatMessageViewController: NSViewController {
    
    @IBOutlet weak var messageTableView: NSTableView!
    
    fileprivate var messageList = [Message]()
    
    ...
    
}

Create append() Methods

The append() methods are used to add messages and alerts to the message window.

  • The append() method for a chat creates a new Message object of type .chat and invokes the append() method for the message.

  • The append() method for an alert creates a new Message object of type .alert and invokes the append() method for message.

    func append(chat text: String, fromUid uid: Int64) {
        let message = Message(text: text, type: .chat)
        append(message: message)
    }
    
    func append(alert text: String) {
        let message = Message(text: text, type: .alert)
        append(message: message)
    }

The append() method for a message is created in an extension for the ChatMessageViewController.

The message is added to the messageList.

When the messageList contains more than 20 messages, delete the first message in the array using updateMessageTable().

private extension ChatMessageViewController {
    func append(message: Message) {
        messageList.append(message)
        
        var deleted: Message?
        if messageList.count > 20 {
            deleted = messageList.removeFirst()
        }
        
        updateMessageTable(withDeleted: deleted)
    }
    
    ...
    
}

The updateMessageTable() method is a helper method to handle messages for the chat view.

  1. Check that the messageTableView exists. If it does not exist, stop the method using return.

  2. If deleted is equal to nil, remove the first message using tableView.removeRows().

  3. Retrieve the IndexSet for the last message by using messageList.count - 1.

  4. Add the new message to the table using tableView.insertRows().

  5. Display the last message on the screen using tableView.scrollRowToVisible().

    func updateMessageTable(withDeleted deleted: Message?) {
        guard let tableView = messageTableView else {
            return
        }
        
        if deleted != nil {
            tableView.removeRows(at: IndexSet(integer: 0), withAnimation: NSTableViewAnimationOptions())
        }
        
        let lastRow = messageList.count - 1
        tableView.insertRows(at: IndexSet(integer: lastRow), withAnimation: NSTableViewAnimationOptions())
        tableView.scrollRowToVisible(lastRow)
    }

Create the UITableViewDataSource Object

The tableView data source method is defined in an extension to the ChatMessageViewController.

Return a messageList.count as the number of rows in the table section.

extension ChatMessageViewController: NSTableViewDataSource {
    func numberOfRows(in tableView: NSTableView) -> Int {
        return messageList.count
    }
}

The tableView delegate methods are defined in an extension to the ChatMessageViewController.

Retrieve each cell for the table:

  1. Create the table cell using tableView.make().

  2. Set the cell message using cell.set and return the resulting cell.

extension ChatMessageViewController: NSTableViewDelegate {
    func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
        let cell = tableView.make(withIdentifier: "messageCell", owner: self) as! ChatMessageCellView
        let message = messageList[row]
        cell.set(with: message)
        return cell
    }
    
    ...
    
}

Set the height for each cell in the table:

  1. Initialize a local defaultHeight variable to 24.
  2. Retrieve the text for the current row using messageList[row].text.
  3. Retrieve the first column of the table using tableView.tableColumns.first.
  4. Initialize a local width variable to column.width - 24.
  5. Create a bounding rectangle for the text using string.boundingRect().
  6. Set the text height using textRect.height + 6 and ensure that the result is at least defaultHeight.
  7. Return the resulting textHeight.
    func tableView(_ tableView: NSTableView, heightOfRow row: Int) -> CGFloat {
        let defaultHeight: CGFloat = 24
        let string: NSString = messageList[row].text as NSString
        
        let column = tableView.tableColumns.first!
        let width = column.width - 24
        let textRect = string.boundingRect(with: NSMakeSize(width, 0), options: [.usesLineFragmentOrigin], attributes: [NSFontAttributeName: NSFont.systemFont(ofSize: 12)])
        
        var textHeight = textRect.height + 6
        
        if textHeight < defaultHeight {
            textHeight = defaultHeight;
        }
        return textHeight;
    }

Create the DevicesViewController Class

DevicesViewController.swift defines and connects application functionality with the DevicesViewController UI.

The DevicesViewController class has two global variables that serve as notification key constants.

The remaining code in this section is contained within the NSViewController declaration.

import Cocoa

let DeviceListChangeNotificationKey = "io.agora.deviceListChangeNotification"
let VolumeChangeNotificationKey = "io.agora.volumeChangeNotification"

class DevicesViewController: NSViewController {

	...
	
}

Define IBOutlet Variables

The DevicesViewController class defines a set of UI elements for input device, output device, and camera controls using IBOutlet variables.

Input Device Variable Description
inputDevicePopUpButton Dropdown menu for the list of available input devices
inputDeviceVolSlider Volume control for the selected input device
intputDeviceTestButton Button to test the selected input device
inputDeviceVolLevelIndicator Volume level indicator for the selected input device 
    @IBOutlet weak var inputDevicePopUpButton: NSPopUpButton!
    @IBOutlet weak var inputDeviceVolSlider: NSSlider!
    @IBOutlet weak var intputDeviceTestButton: NSButton!
    @IBOutlet weak var inputDeviceVolLevelIndicator: NSLevelIndicator!
Output Device Variable Description
outputDevicePopUpButton Dropdown menu for the list of available output devices
outputDeviceVolSlider Volume control for the selected output device
outputDeviceTestButton Button to test the selected output device 
    @IBOutlet weak var outputDevicePopUpButton: NSPopUpButton!
    @IBOutlet weak var outputDeviceVolSlider: NSSlider!
    @IBOutlet weak var outputDeviceTestButton: NSButton!
Output Device Variable Description
cameraPopUpButton Dropdown menu for the list of available camera devices
cameraTestButton Button to test the selected camera device
cameraPreviewView View to display the video from the selected camera device 
    @IBOutlet weak var cameraPopUpButton: NSPopUpButton!
    @IBOutlet weak var cameraTestButton: NSButton!
    @IBOutlet weak var cameraPreviewView: NSView!

Define Public and Private Variables

The DevicesViewController class has two public variables and many private variables.

  • The agoraKit variable is the Agora RTC engine, which connects the sample application to the Agora SDK.

  • The couldTest variable is set to true as a default and acts as the indicator if the device can be tested.

    var agoraKit: AgoraRtcEngineKit!
    var couldTest = true

Declare a set of private variables for the recording, playout, and capture devices.

Variable Description
recordingDeviceId ID of the current recording device
recordingDevices Array of recording devices
playoutDeviceId ID of the current playout device
playoutDevices Array of playout devices
captureDeviceId ID of the current capture device
captureDevices Array of capture devices 
    fileprivate var recordingDeviceId: String?
    fileprivate var recordingDevices = [AgoraRtcDeviceInfo]()
    fileprivate var playoutDeviceId: String?
    fileprivate var playoutDevices = [AgoraRtcDeviceInfo]()
    fileprivate var captureDeviceId: String?
    fileprivate var captureDevices = [AgoraRtcDeviceInfo]()

Declare a set of private variables that apply changes to the sample application using didSet.

The isInputTesting variable is set to false as a default. When the value changes:

  1. Change the configuration of intputDeviceTestButton using config().
  2. If isInputTesting is true, start the recording device test using agoraKit?.startRecordingDeviceTest(), Otherwise, stop the test using agoraKit?.stopRecordingDeviceTest().
  3. Display/hide inputDeviceVolLevelIndicator by applying isInputTesting to the isHidden property.
    fileprivate var isInputTesting = false {
        didSet {
            config(button: intputDeviceTestButton, isTesting: isInputTesting)
            if isInputTesting {
                agoraKit?.startRecordingDeviceTest(200)
            } else {
                agoraKit?.stopRecordingDeviceTest()
            }
            inputDeviceVolLevelIndicator?.isHidden = !isInputTesting
        }
    }

The isOutputTesting variable is set to false as a default. When the value changes:

  1. Change the configuration of the outputDeviceTestButton using config().

  2. If isOutputTesting is true, start the playback device test using agoraKit?.startPlaybackDeviceTest(). Otherwise, stop the test using agoraKit?.stopPlaybackDeviceTest().

    Note: Ensure that the path for the test audio asset is valid before invoking the agoraKit?.startPlaybackDeviceTest().

  3. Display/hide the inputDeviceVolLevelIndicator by applying isInputTesting to the isHidden property.

    fileprivate var isOutputTesting = false {
        didSet {
            config(button: outputDeviceTestButton, isTesting: isOutputTesting)
            if isOutputTesting {
                if let path = Bundle.main.path(forResource: "test", ofType: "wav") {
                    agoraKit?.startPlaybackDeviceTest(path)
                }
            } else {
                agoraKit?.stopPlaybackDeviceTest()
            }
        }
    }

The isCameraputTesting variable is set to false as a default. When the value changes:

  1. Change the configuration of the cameraTestButton using config().

  2. If isCameraputTesting is true, ensure that the view for the video preview is valid and start the playback device test using agoraKit?.startCaptureDeviceTest(). Otherwise, stop the test using agoraKit?.stopCaptureDeviceTest().

    fileprivate var isCameraputTesting = false {
        didSet {
            config(button: cameraTestButton, isTesting: isCameraputTesting)
            if isCameraputTesting {
                if let view = cameraPreviewView {
                    agoraKit?.startCaptureDeviceTest(view)
                }
            } else {
                agoraKit?.stopCaptureDeviceTest()
            }
        }
    }

The deviceVolume variable is set to 0 as a default. When the value changes, set the inputDeviceVolLevelIndicator?.integerValue to deviceVolume.

    fileprivate var deviceVolume = 0 {
        didSet {
            inputDeviceVolLevelIndicator?.integerValue = deviceVolume
        }
    }

Create Superclass Override Methods

The methods in this section override the NSViewController superclass methods that are invoked when changes to the view occur.

The viewDidLoad() method is triggered when the view loads into the sample application.

  1. Update the wantsLayer property of the view to true and the layer's backgroundColor property to white.
  2. Update the wantsLayer property of the cameraPreviewView to true and the layer's backgroundColor property to black.
  3. Update the button style configurations using configButtonStyle().
  4. Load the devices using loadDevices().
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.wantsLayer = true
        view.layer?.backgroundColor = NSColor.white.cgColor
        cameraPreviewView.wantsLayer = true
        cameraPreviewView.layer?.backgroundColor = NSColor.black.cgColor
        
        configButtonStyle()
        
        loadDevices()
    }

The viewWillAppear() method is triggered when the view appears on the screen.

Set the configuration style of view.window using configStyle().

    override func viewWillAppear() {
        super.viewWillAppear()
        configStyle(of: view.window!)
    }

The viewWillDisappear() method is triggered the view is hidden from the screen.

If couldTest is true:

  • Set isInputTesting to false if isInputTesting is valid.
  • Set isOutputTesting to false if isOutputTesting is valid.
  • Set isCameraputTesting to false if isCameraputTesting is valid.
    override func viewWillDisappear() {
        super.viewWillDisappear()
        
        if couldTest {
            if isInputTesting {
                isInputTesting = false
            }
            if isOutputTesting {
                isOutputTesting = false
            }
            if isCameraputTesting {
                isCameraputTesting = false
            }
        }
    }

Create IBAction Methods

Create Input/Output Device Change Methods

The doInputDeviceChanged() method is applied to the input device dropdown menu created in the DevicesViewController UI.

  • If isInputTesting is true, set the value to false.
  • Retrieve the deviceId using the indexOfSelectedItem property of the recordingDevices dropdown menu and set the selected device using agoraKit.setDevice().
    @IBAction func doInputDeviceChanged(_ sender: NSPopUpButton) {
        if isInputTesting {
            isInputTesting = false
        }
        if let deviceId = recordingDevices[sender.indexOfSelectedItem].deviceId {
            agoraKit.setDevice(.audioRecording, deviceId: deviceId)
        }
    }

The doOutputDeviceChanged() method is applied to the output device dropdown menu created in the DevicesViewController UI.

  • If isOutputTesting is true, set the value to false.
  • Retrieve the deviceId using the indexOfSelectedItem property of the playoutDevices dropdown menu and set the selected device using agoraKit.setDevice().
    @IBAction func doOutputDeviceChanged(_ sender: NSPopUpButton) {
        if isOutputTesting {
            isOutputTesting = false
        }
        if let deviceId = playoutDevices[sender.indexOfSelectedItem].deviceId {
            agoraKit.setDevice(.audioPlayout, deviceId: deviceId)
        }
    }
Create Input/Output Test Methods

The doInputDeviceChanged() method is applied to the input device Test button created in the DevicesViewController UI.

Update the value of isInputTesting.

    @IBAction func doInputDeviceTestClicked(_ sender: NSButton) {
        isInputTesting = !isInputTesting
    }

The doInputDeviceChanged() method is applied to the output device Test button created in the DevicesViewController UI.

Update the value of isOutputTesting.

    @IBAction func doOutputDeviceTestClicked(_ sender: NSButton) {
        isOutputTesting = !isOutputTesting
    }
Create Input/Output Volume Change Methods

The doInputDeviceChanged() method is applied to the input device Volume slider created in the DevicesViewController UI.

Retrieve the input volume using the sender.intValue and set the device volume using agoraKit.setDeviceVolume().

    @IBAction func doInputVolSliderChanged(_ sender: NSSlider) {
        let vol = sender.intValue
        agoraKit.setDeviceVolume(.audioRecording, volume: vol)
    }

The doOutputVolSliderChanged() method is applied to the output device Volume slider created in the DevicesViewController UI.

Retrieve the output volume using the sender.intValue and set the device volume using agoraKit.setDeviceVolume().

    @IBAction func doOutputVolSliderChanged(_ sender: NSSlider) {
        let vol = sender.intValue
        agoraKit.setDeviceVolume(.audioPlayout, volume: vol)
    }
Create Camera Methods

The doCameraChanged() method is applied to the camera device dropdown menu created in the DevicesViewController UI.

  • If isCameraputTesting is true, set the value to false.
  • Retrieve the deviceId using the indexOfSelectedItem property of the captureDevices dropdown menu and set the selected device using agoraKit.setDevice().
    @IBAction func doCameraChanged(_ sender: NSPopUpButton) {
        if isCameraputTesting {
            isCameraputTesting = false
        }
        if let deviceId = captureDevices[sender.indexOfSelectedItem].deviceId {
            agoraKit.setDevice(.videoCapture, deviceId: deviceId)
        }
    }

The doCameraTestClicked() method is applied to the camera device Test button created in the DevicesViewController UI.

Update the value of isCameraputTesting.

    @IBAction func doCameraTestClicked(_ sender: NSButton) {
        isCameraputTesting = !isCameraputTesting
    }

Create the DevicesViewController Class Extensions

The configuration private methods for DevicesViewController are contained within two sets of extensions.

private extension DevicesViewController {
	...
}

private extension DevicesViewController {
	...
}

Define Configuration Private Methods

The first extension contains methods that set the configuration and styles of the UI elements.

The configStyle() method configures the style of the window.

Insert the full-sized content view to the style mask using styleMask.insert().

Configure the window properties.

window Property Value Description
titlebarAppearsTransparent true Makes the window's title bar transparent
isMovableByWindowBackground true Enables the window to move by dragging on its background
minSize CGSize(width: 600, height: 600) Minimum size of the window
maxSize CGSize(width: 600, height: 600) Maximum size of the window 
    func configStyle(of window: NSWindow) {
        window.styleMask.insert(.fullSizeContentView)
        window.titlebarAppearsTransparent = true
        window.isMovableByWindowBackground = true
        
        window.minSize = CGSize(width: 600, height: 600)
        window.maxSize = CGSize(width: 600, height: 600)
    }

The configButtonStyle() method configures the style of the buttons.

  • Set the intputDeviceTestButton, outputDeviceTestButton, and cameraTestButton buttons to non-testing mode using config().
  • Set the intputDeviceTestButton, outputDeviceTestButton, and cameraTestButton buttons to hidden/not hidden using the isHidden property.
    func configButtonStyle() {
        config(button: intputDeviceTestButton, isTesting: false)
        config(button: outputDeviceTestButton, isTesting: false)
        config(button: cameraTestButton, isTesting: false)
        
        intputDeviceTestButton.isHidden = !couldTest
        outputDeviceTestButton.isHidden = !couldTest
        cameraTestButton.isHidden = !couldTest
    }

The config() method configures the title of a button using the title property.

If isTesting is true, set the title to Stop Test. Otherwise, set it to Test.

    func config(button: NSButton, isTesting: Bool) {
        button.title = isTesting ? "Stop Test" : "Test"
    }

Define Load and Update Methods

The second extension contains methods that load and update the UI elements.

The loadDevices() method loads the selected devices for testing.

Load the playout, recording, and video capture devices using loadDevice().

Create a notification observer for the DeviceListChangeNotificationKey using NotificationCenter.default.addObserver(). When the event listener is triggered, verify that the notify.object is a number and that its type is valid before loading the device using self?.loadDevice().

If couldTest is true, create a notification observer for the VolumeChangeNotificationKey using NotificationCenter.default.addObserver(). When the event listener is triggered, verify that the notify.object is a number and set the device volume using self?.deviceVolume.

    func loadDevices() {
        loadDevice(of: .audioPlayout)
        loadDevice(of: .audioRecording)
        loadDevice(of: .videoCapture)
        
        NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: DeviceListChangeNotificationKey), object: nil, queue: nil) { [weak self] (notify) in
            if let obj = notify.object as? NSNumber, let type = AgoraMediaDeviceType(rawValue: obj.intValue) {
                self?.loadDevice(of: type)
            }
        }
        
        if couldTest {
            NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: VolumeChangeNotificationKey), object: nil, queue: nil, using: { [weak self] (notify) in
                if let obj = notify.object as? NSNumber {
                    self?.deviceVolume = obj.intValue
                }
            })
        }
    }

The loadDevice() method loads a selected device.

Ensure that the device type is a valid device type before continuing with the remaining actions in the method.

Retrieve the device ID from the type using the agoraKit.getDeviceId() and apply changes to one of the following device types based on the value of type:

Value Description
.audioRecording Recording device
.audioPlayout Playout device
.videoCapture video capture device
  • Set the devices array with the value of devices.
  • Set the device ID with the value of deviceId.
  • Update the dropdown menu for the device using updatePopUpButton().

Complete the method by updating the volume using updateVolume().

    func loadDevice(of type: AgoraMediaDeviceType) {
        guard let devices = agoraKit.enumerateDevices(type)! as NSArray as? [AgoraRtcDeviceInfo] else {
            return
        }
        
        let deviceId = agoraKit.getDeviceId(type)
        switch type {
        case .audioRecording:
            recordingDevices = devices
            recordingDeviceId = deviceId
            updatePopUpButton(inputDevicePopUpButton, withValue: deviceId, inValueList: devices)
        case .audioPlayout:
            playoutDevices = devices
            playoutDeviceId = deviceId
            updatePopUpButton(outputDevicePopUpButton, withValue: deviceId, inValueList: devices)
        case .videoCapture:
            captureDevices = devices
            captureDeviceId = deviceId
            updatePopUpButton(cameraPopUpButton, withValue: deviceId, inValueList: devices)
        default:
            break
        }
        
        updateVolume(of: type)
    }

The updatePopUpButton() method updates the contents of the popup button.

  1. Clear the contents of the button using button.removeAllItems().
  2. Iterate through the supplied AgoraRtcDeviceInfo array using list.map() and add each info.deviceName using button.addItems().
  3. Iterate through the list and add each info.deviceId to deviceIds.
  4. Verify that the value is not null and that the deviceIds.index() is valid, then set the selected item with the index using the button.selectItem ().
    func updatePopUpButton(_ button: NSPopUpButton, withValue value: String?, inValueList list: [AgoraRtcDeviceInfo]) {
        button.removeAllItems()
        button.addItems(withTitles: list.map({ (info) -> String in
            return info.deviceName!
        }))
        
        let deviceIds = list.map { (info) -> String in
            return info.deviceId!
        }
        if let value = value, let index = deviceIds.index(of: value) {
            button.selectItem(at: index)
        }
    }

The updateVolume() method updates the volume of one of the following devices, based on the value of the type:

Type UI Element name
.audioRecording inputDeviceVolSlider
.audioPlayout outputDeviceVolSlider

Retrieve the volume using agoraKit.getDeviceVolume() and set the volume level to vol using the intValue property.

    func updateVolume(of type: AgoraMediaDeviceType) {
        switch type {
        case .audioRecording:
            let vol = agoraKit.getDeviceVolume(type)
            inputDeviceVolSlider.intValue = vol
        case .audioPlayout:
            let vol = agoraKit.getDeviceVolume(type)
            outputDeviceVolSlider.intValue = vol
        default:
            return
        }
    }

Create the SettingsViewController Class

SettingsViewController.swift defines and connects application functionality with the SettingsViewController UI.

Create Variables, Protocols, and IBAction Methods

The settingsVC() protocol method is used by external classes to update the video profile.

import Cocoa

protocol SettingsVCDelegate: class {
    func settingsVC(_ settingsVC: SettingsViewController, closeWithProfile videoProfile: AgoraVideoProfile)
}
Variable Description
profilePopUpButton IBOutlet variable. Maps to the profile popup button created in the SettingsViewController UI.
videoProfile Agora video profile
delegate Optional SettingsVCDelegate object 
class SettingsViewController: NSViewController {
    
    @IBOutlet weak var profilePopUpButton: NSPopUpButton!

    var videoProfile: AgoraVideoProfile!
    var delegate: SettingsVCDelegate?
    
    ...
    
}

Create Methods and Extensions

The viewDidLoad() method is invoked when the application loads the view.

Set view.wantsLayer to true and the view layer background color to NSColor.white.cgColor.

    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.wantsLayer = true
        view.layer?.backgroundColor = NSColor.white.cgColor
        
        loadProfileItems()
    }

The private doProfileChanged() method sets the videoProfile with AgoraVideoProfile objects and is initialized with AgoraVideoProfile.validProfileList().

    @IBAction func doProfileChanged(_ sender: NSPopUpButton) {
        let profile = AgoraVideoProfile.validProfileList()[sender.indexOfSelectedItem]
        videoProfile = profile
    }

The doConfirmClicked() IBAction method is invoked by the Confirm button in the UI layout. This method updates the video profile by invoking delegate?.settingsVC().

    @IBAction func doConfirmClicked(_ sender: NSButton) {
        delegate?.settingsVC(self, closeWithProfile: videoProfile)
    }

The loadProfileItems() method is set within a private extension and populates the profilePopUpButton UI object with an array of AgoraVideoProfile objects.

Loop through the items in the AgoraVideoProfile.validProfileList() and add items to the UI using profilePopUpButton.addItems().

Select a default item using profilePopUpButton.selectItem().

private extension SettingsViewController {
    func loadProfileItems() {
        profilePopUpButton.addItems(withTitles: AgoraVideoProfile.validProfileList().map { (res) -> String in
            return res.description()
        })
        profilePopUpButton.selectItem(withTitle: videoProfile.description())
    }
}

Resources

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License

This software is licensed under the MIT License (MIT). View the license.

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Actively maintained at: https://github.com/AgoraIO/Basic-Video-Call/tree/master/Group-Video/OpenVideoCall-macOS

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