Checks for button array equality to avoid removing and re-adding buttons if possible

Author: Colin Regan

SWTableViewCell/PodFiles/NSMutableArray+SWUtilityButtons.h

@@ -15,3 +15,10 @@
 - (void)sw_addUtilityButtonWithColor:(UIColor *)color normalIcon:(UIImage *)normalIcon selectedIcon:(UIImage *)selectedIcon;
 
 @end
+
+
+@interface NSArray (SWUtilityButtons)
+
+- (BOOL)sw_isEqualToButtons:(NSArray *)buttons;
+
+@end

SWTableViewCell/PodFiles/NSMutableArray+SWUtilityButtons.m

@@ -38,3 +38,45 @@ - (void)sw_addUtilityButtonWithColor:(UIColor *)color normalIcon:(UIImage *)norm
 
 @end
 
+
+@implementation NSArray (SWUtilityButtons)
+
+- (BOOL)sw_isEqualToButtons:(NSArray *)buttons
+{
+    buttons = [buttons copy];
+    if (!buttons || self.count != buttons.count) return NO;
+    
+    for (NSUInteger idx = 0; idx < self.count; idx++) {
+        id buttonA = self[idx];
+        id buttonB = buttons[idx];
+        if (![buttonA isKindOfClass:[UIButton class]] || ![buttonB isKindOfClass:[UIButton class]]) return NO;
+        if (![[self class] sw_button:buttonA isEqualToButton:buttonB]) return NO;
+    }
+    
+    return YES;
+}
+
++ (BOOL)sw_button:(UIButton *)buttonA isEqualToButton:(UIButton *)buttonB
+{
+    if (!buttonA || !buttonB) return NO;
+    
+    UIColor *backgroundColorA = buttonA.backgroundColor;
+    UIColor *backgroundColorB = buttonB.backgroundColor;
+    BOOL haveEqualBackgroundColors = (!backgroundColorA && !backgroundColorB) || [backgroundColorA isEqual:backgroundColorB];
+    
+    NSString *titleA = [buttonA titleForState:UIControlStateNormal];
+    NSString *titleB = [buttonB titleForState:UIControlStateNormal];
+    BOOL haveEqualTitles = (!titleA && !titleB) || [titleA isEqualToString:titleB];
+    
+    UIImage *normalIconA = [buttonA imageForState:UIControlStateNormal];
+    UIImage *normalIconB = [buttonB imageForState:UIControlStateNormal];
+    BOOL haveEqualNormalIcons = (!normalIconA && !normalIconB) || [normalIconA isEqual:normalIconB];
+    
+    UIImage *selectedIconA = [buttonA imageForState:UIControlStateSelected];
+    UIImage *selectedIconB = [buttonB imageForState:UIControlStateSelected];
+    BOOL haveEqualSelectedIcons = (!selectedIconA && !selectedIconB) || [selectedIconA isEqual:selectedIconB];
+    
+    return haveEqualBackgroundColors && haveEqualTitles && haveEqualNormalIcons && haveEqualSelectedIcons;
+}
+
+@end

SWTableViewCell/PodFiles/SWTableViewCell.m

@@ -175,20 +175,24 @@ - (void)setContainingTableView:(UITableView *)containingTableView
 
 - (void)setLeftUtilityButtons:(NSArray *)leftUtilityButtons
 {
-    _leftUtilityButtons = leftUtilityButtons;
-    
-    self.leftUtilityButtonsView.utilityButtons = leftUtilityButtons;
-    
-    [self layoutIfNeeded];
+    if (![_leftUtilityButtons sw_isEqualToButtons:leftUtilityButtons]) {
+        _leftUtilityButtons = leftUtilityButtons;
+        
+        self.leftUtilityButtonsView.utilityButtons = leftUtilityButtons;
+        
+        [self layoutIfNeeded];
+    }
 }
 
 - (void)setRightUtilityButtons:(NSArray *)rightUtilityButtons
 {
-    _rightUtilityButtons = rightUtilityButtons;
-    
-    self.rightUtilityButtonsView.utilityButtons = rightUtilityButtons;
-    
-    [self layoutIfNeeded];
+    if (![_rightUtilityButtons sw_isEqualToButtons:rightUtilityButtons]) {
+        _rightUtilityButtons = rightUtilityButtons;
+        
+        self.rightUtilityButtonsView.utilityButtons = rightUtilityButtons;
+        
+        [self layoutIfNeeded];
+    }
 }
 
 #pragma mark - UITableViewCell overrides