ios - 如何在动画过程中检测 UIImageView 上的点击？

Question

我尝试检测 UIImageView 在动画过程中的点击，但它不起作用。

我做什么(swift 4):

通过 StoryBoard 添加 UIImageView:

@IBOutlet weak var myImageView: UIImageView!

做动画:

override func viewWillAppear (_ animated: Bool) {
        super.viewWillAppear (animated)

        myImageView.center.y + = view.bounds.height

    }


    override func viewDidAppear (_ animated: Bool) {
        super.viewDidAppear (animated)

        UIView.animate (withDuration: 10, delay: 0, options: [.repeat, .autoreverse, .allowUserInteraction], animations: {
            self.myImageView.center.y - = self.view.bounds.height
        })
    }

尝试检测点击:

override func viewDidLoad () {
        super.viewDidLoad ()

        let gestureSwift2AndHigher = UITapGestureRecognizer (target: self, action: #selector (self.actionUITapGestureRecognizer))
        myImageView.isUserInteractionEnabled = true
        myImageView.addGestureRecognizer (gestureSwift2AndHigher)

    }


    @objc func actionUITapGestureRecognizer () {

        print ("actionUITapGestureRecognizer - works!")

    }

请在对问题进行投票之前，确保没有针对此类问题的正常公式化答案，初学者可以理解并且在版本 2 以上的 swift 中编写，因此我不能将它们应用于我的案例。

研究这个问题，我意识到有必要调整框架!？但这对我来说仍然很难。请告诉我我需要在下面的代码中添加或更改什么。

感谢您的帮助。

class ExampleViewController: UIViewController {

    @IBOutlet weak var myImageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // action by tap
        let gestureSwift2AndHigher = UITapGestureRecognizer(target: self, action:  #selector (self.actionUITapGestureRecognizer))
        myImageView.isUserInteractionEnabled = true
        myImageView.addGestureRecognizer(gestureSwift2AndHigher)

    }

    // action by tap
    @objc func actionUITapGestureRecognizer (){

        print("actionUITapGestureRecognizer - works!") // !!! IT IS DOES NOT WORK !!!

    }

    // hide UIImageView before appear
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        myImageView.center.y += view.bounds.height

    }

    // show UIImageView after appear with animation
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        UIView.animate(withDuration: 10, delay: 0, options: [.repeat, .autoreverse, .allowUserInteraction], animations: {
            self.myImageView.center.y -= self.view.bounds.height
        })
    }
}

Answer 1

要检测移动(动画) View 上的触摸，只需使用表示层覆盖 hitTest:

override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    
    return (layer.presentation()!.frame)
                      .contains(self.convert(point, to: superview!)) ? self : nil
}

举个例子

1. 它适用于所有手势识别器

2. 请勿在 View Controller 级别修改任何框架或任何其他内容

3. 简单地继承 View 本身，添加上面的覆盖

当然不要忘记这一点，如果您想在项目被抓取后停止动画，请(在您的 View Controller 中)使用 yourPropertyAnimator?.stopAnimation(true) ， yourPropertyAnimator = nil