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public func promise(_ vc: UIImagePickerController, animated: Bool = false, completion: (() -> Void)? = nil) -> Promise<NSData> {
let proxy = UIImagePickerControllerProxy()
vc.delegate = proxy
present(vc, animated: animated, completion: completion)
return proxy.promise.then(on: nil) { info -> Promise<NSData> in
#if swift(>=4.2)
let url = info[.referenceURL] as! URL
#else
let url = info[UIImagePickerControllerReferenceURL] as! URL
#endif
return Promise { seal in
ALAssetsLibrary().asset(for: url, resultBlock: { asset in
let N = Int(asset!.defaultRepresentation().size())
let bytes = UnsafeMutablePointer<UInt8>.allocate(capacity: N)
var error: NSError?
asset!.defaultRepresentation().getBytes(bytes, fromOffset: 0, length: N, error: &error)
if let error = error {
seal.reject(error)
} else {
seal.fulfill(NSData(bytesNoCopy: bytes, length: N))
}
}, failureBlock: { seal.reject($0!) } )
}
}.ensure {
self.dismiss(animated: animated, completion: nil)
}
}
}
RomanPodymov
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