即使添加了一个视图，UIViewContorller的触摸事件仍然会收到

Question

有一个简单的UIViewController有两个按钮，每按一个按钮，全屏视图将被添加到viewcontorller的视图，因为它的大小与viewcontroller相同。

我们知道如果视图与其父视图重叠，则父视图无法响应任何事件。

但是，如果我按下button0然后非常快按button1，视图将添加到viewcontorller并且第二个按钮的触摸事件也会被唤起。

这是我的代码：

@IBAction func button0Pressed(_ sender: Any) {
        print(#function)
        let view0 = UIView(frame: view.bounds)
        view0.backgroundColor = UIColor.gray
        let tap0 = UITapGestureRecognizer(target: self, action: #selector(tap0(_:)))
        view0.addGestureRecognizer(tap0)
        view.addSubview(view0)
    }

    @objc func tap0(_ gestureRecognizer: UITapGestureRecognizer) {
        print(#function)
        let view = gestureRecognizer.view
        view?.removeFromSuperview()
    }

    @IBAction func button1Pressed(_ sender: Any) {
        print(#function)
        let view1 = UIView(frame: view.bounds)
        view1.backgroundColor = UIColor.lightGray
        let tap1 = UITapGestureRecognizer(target: self, action: #selector(tap1(_:)))
        view1.addGestureRecognizer(tap1)
        view.addSubview(view1)
    }


    @objc func tap1(_ gestureRecognizer: UITapGestureRecognizer) {
        print(#function)
        let view = gestureRecognizer.view
        view?.removeFromSuperview()
    }

出局：

button0Pressed
button1Pressed

那么，如何在按下viewcontroller后阻止button0s快速触摸事件？

Answer 1

您可以尝试将两个按钮（button0和button1）设置为IBOutlet并指定touchUpInside事件以触发button0Press / button1Press功能。然后你可能有enable button1 after x seconds（在我的例子中为1秒）按下了button0。反之亦然。

@IBOutlet weak var button0: UIButton!
@IBOutlet weak var button1: UIButton!


override func viewDidLoad() {
    super.viewDidLoad()
    button0.addTarget(self, action: #selector(button0Pressed), for: .touchUpInside)
    button1.addTarget(self, action: #selector(button1Pressed), for: .touchUpInside)
}

@objc func button0Pressed() {
    print(#function)
    let view0 = UIView(frame: view.bounds)
    view0.backgroundColor = UIColor.gray
    let tap0 = UITapGestureRecognizer(target: self, action: #selector(tap0(_:)))
    view0.addGestureRecognizer(tap0)
    view.addSubview(view0)

    // Enable button1 after 1 second
    DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(1000)) {
        self.button1.isEnabled = true
    }
}

@objc func button1Pressed() {
    print(#function)
    let view1 = UIView(frame: view.bounds)
    view1.backgroundColor = UIColor.lightGray
    let tap1 = UITapGestureRecognizer(target: self, action: #selector(tap1(_:)))
    view1.addGestureRecognizer(tap1)
    view.addSubview(view1)

    // Enable button0 after 1 second
    DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(1000)) {
        self.button0.isEnabled = true
    }
}