iOS swift : Send action (control event) from subclass of UIImageView

Question

如何从 UIImageView 的子类向 View Controller 发送操作(类似点击事件)。

Here is reference answer ，我想申请 UIImageView。 (UIImageView 在其父类(super class)层次结构中没有 UIControl)

以下是我的代码，但无法正常工作，因为我不知道如何实现，我需要什么。

class TappableImageView: UIImageView {
  // Initializer methods.....

   //------------------------------------------
    private func addTapGesture(){
        let tapOnImage = UITapGestureRecognizer(target: self, action: #selector(TappableImageView.handleTapGesture(tapGesture:)))
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(tapOnImage)

    }


    //----------------------------------------------
    @objc func handleTapGesture(tapGesture: UITapGestureRecognizer) {
        // how can I send tap/click event to all view controllers, where I've used this image  from this point. 
    }
}

有没有可能适合我的替代/其他解决方案？

Answer 1

我建议您使用闭包来处理水龙头:

class TappableImageView: UIImageView {

   var handleTap: (() -> Void)? = nil


   //------------------------------------------
    private func addTapGesture(){
        let tapOnImage = UITapGestureRecognizer(target: self, action: #selector(TappableImageView.handleTapGesture(tapGesture:)))
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(tapOnImage)

    }


    //----------------------------------------------
    @objc func handleTapGesture(tapGesture: UITapGestureRecognizer) {
        handleTap?()
    }
}

然后我是你的 View Controller ，你可以在 viewDidLoad 方法中使用它:

override func viewDidLoad() {
    super.viewDidLoad()
    yourTappableImageView.handleTap = { 
       print("an image view was tapped")
    }
}

它假定您的 TappableImageView 存储在名为 yourTappableImageView 的变量中。