添加封閉到的CustomButton斯威夫特

Question

我試圖在對象 - 下面的代碼轉換爲SWIFT：

CustomButton.h

​​

CustomButton.m

- (void)executeTargetActionBlock { 
     if (self.defaultAction) 
      self.defaultAction(); 
} 

- (void) initialize { 
[self addTarget:self action:@selector(executeTargetActionBlock) forControlEvents:UIControlEventTouchUpInside]; 
} 

這個initializeMethod在CustomButton的init方法中被調用。

Answer 1

class CustomButton: UIButton { 
    var defaultAction: (() -> Void)? 

    override init(frame: CGRect) { 
     super.init(frame: frame) 

     self.addTarget(self, action: "executeTargetActionBlock", forControlEvents: UIControlEvents.TouchUpInside) 
    } 

    func executeTargetActionBlock() { 
     if let action = defaultAction { 
      action() 
     } 
    } 
}