UIButton 不可点击但可接收手势

Question

我有一个 UIButton，我希望它可以随 pan gesture 一起移动，但无法单击它。我想要的是当用户点击按钮时按钮不会改变其外观，就像您只是点击一个视图一样。将 isEnabled 设置为 false 并将 userInteractionIsEnabled 设置为 false 都会导致按钮未收到 pan events。我可以通过自定义视图实现所需的效果，但我可以通过按钮以某种方式实现吗？根据要求发布带有按钮创建的代码片段：

func createAnswerButton() {
    let width : CGFloat = 154
    let height : CGFloat = 60
    let originX = (view.frame.size.width - width) / 2
    let originY = startOverButton.frame.origin.y + collectionView.frame.size.height
    let frame = CGRect(x: originX, y: originY, width: width, height: height)
    let button = UIButton(frame: frame)
    answerButton = button
    button.backgroundColor = .clear
    self.answerButton.setTitleColor(.white, for: .normal)
    let image = UIImage(named: "item_neutral")
    button.setBackgroundImage(image, for: .normal)
    view.addSubview(button)

    let panGesture = UIPanGestureRecognizer(target: self, action: (#selector(MoviesViewController.didPanButton(_:))))
    button.addGestureRecognizer(panGesture)
}

Answer 1

几乎你必须说按钮更喜欢一个手势而不是另一个

例如：

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, 
      shouldRequireFailureOf otherGestureRecognizer:  UIGestureRecognizer) -> Bool {
    // Don't recognize a single tap until a double-tap fails.
     if gestureRecognizer == self.tapGesture && 
      otherGestureRecognizer == self.doubleTapGesture {
  return true

} return 错误 }

有关更多信息，请关注 link：

https://developer.apple.com/documentation/uikit/touches_presses_and_gestures/coordinating_multiple_gesture_recognizers/preferring_one_gesture_over_another

Answer 2

试试这个，

func createAnswerButton() {
        let width : CGFloat = 154
        let height : CGFloat = 60
        let originX = (view.frame.size.width - width) / 2
        let originY = startOverButton.frame.origin.y + collectionView.frame.size.height
        let frame = CGRect(x: originX, y: originY, width: width, height: height)
        let button = UIButton(frame: frame)
        answerButton = button
        button.backgroundColor = .clear
        self.answerButton.setTitleColor(.white, for: .normal)
        let image = UIImage(named: "item_neutral")
        button.setBackgroundImage(image, for: .normal)
        button.addTarget(self, action: #selector(self.buttonClicked(_:)), for: .touchUpInside)
        view.addSubview(button)

        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture))
        button.addGestureRecognizer(panGesture)
    }
    @objc func handlePanGesture(sender: UIPanGestureRecognizer? = nil) {
        print("Pan Gesture detected")
        var buttonCenter : CGPoint = button.center
        if sender?.state == .began {
            buttonCenter = button.center
        } else if sender?.state == .ended || sender?.state == .failed || sender?.state == .cancelled {
            button.center = buttonCenter
        } else {
            let location = sender?.location(in: view)
            button.center = location!
        }
        print("\(buttonCenter)")
    }
    @objc func buttonClicked(_ sender: UIButton){
        print("Button Click detected")
    }

Answer 3

为此，您必须将按钮的 adjustsImageWhenHighlighted 设置为 false（如果您想以编程方式进行）。在界面生成器中，您可以将按钮 type 更改为 custom。

这是以编程方式执行此操作的代码：

 override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

    let width : CGFloat = 154
    let height : CGFloat = 60
    let originX = (view.frame.size.width - width) / 2
    let originY = (view.frame.size.height - width) / 2
    let frame = CGRect(x: originX, y: originY, width: width, height: height)

    let button = UIButton(type: .custom)
    button.adjustsImageWhenHighlighted = false
    button.frame = frame

    button.addTarget(self, action: #selector(buttonInCodeTapped), for: .touchUpInside)
    button.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(panForButtonInCode(recognizer:))))
    button.setBackgroundImage(UIImage(named: "X"), for: .normal)
    view.addSubview(button)
}

这是属性设置为 false 时的结果：

这是属性设置为 true 时的结果（您可以看到，点击时 X 会突出显示）：

UIButton 不可点击但可接收手势

UIButton to not be clickable but to receive gestures

ios

uibutton

uipangesturerecognizer