将手势识别器添加到屏幕外的元素

Question

我有一个视图，它的宽度是我的设备屏幕宽度的两倍，并具有向左或向右移动视图的滑动手势识别器。但是我已经认识到，如果在原本不在屏幕上的部分视图上执行轻扫，视图将不会执行手势操作。

// View twice as wide as the device screen 
let masterView = UILabel(frame: CGRect(x: 0, y: 0, width: self.view.frame.width * 2, height: 100)) 

let swipeLeftGesture = UISwipeGestureRecognizer(target: self, action: #selector(ThisViewController.swipeLeft)) 
let swipeRightGesture = UISwipeGestureRecognizer(target: self, action: #selector(ThisViewController.swipeRight)) 
swipeLeftGesture.direction = UISwipeGestureRecognizerDirection.left 
swipeRightGesture.direction = UISwipeGestureRecognizerDirection.right 
masterView.addGestureRecognizer(swipeLeftGesture) 
masterView.addGestureRecognizer(swipeRightGesture) 
self.addSubview(masterView) 


func swipeLeft() {   
    // Moves masterView to the left equal to that of the width of the screen (or half of masterView's total width) 
    let moveLeftFrame = CGRect(x: (masterView.frame.width/2) * -1, y: masterView.frame.minY, width: masterView.frame.width, height: masterView.frame.height) 

    UIView.animateKeyframes(withDuration: 0.5, delay: 0, options: .calculationModeCubic, animations: { 
     UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 0.4, animations: { 
      masterView.frame = moveLeftFrame 
     }) 
    }, completion: { (true) in 

    }) 
} 


func swipeRight() {   
    // Moves masterView back to original location 
    let moveRightFrame = CGRect(x: 0, y: masterView.frame.minY, width: masterView.frame.width, height: masterView.frame.height) 

    UIView.animateKeyframes(withDuration: 0.5, delay: 0, options: .calculationModeCubic, animations: { 
     UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 0.4, animations: { 
      masterView.frame = moveRightFrame 
     }) 
    }, completion: { (true) in 

    }) 
} 

于是往左滑动来查看视图（其上装载关屏）的另一半后，我无法刷卡回到正确的。不能在已加载屏幕的位置执行手势操作？

编辑：所以在修补了一下之后，我发现手势无法识别在加载离屏的视图的任何位置。因此，如果我移动视图以查看从屏幕外开始的50个像素，则无法在该50个像素上识别手势。

Answer 1

我真的不明白你的答案，但希望这可以帮助

因此，我认为你的问题是

1. 你声明你刷卡功能是错误的方式。相反FUNC swipeLeft的（）将其更改为FUNC swipeLeft（发件人：UISwipeGestureRecognizer）

或

1. 问题可能是你在你的声明框架变量的方式。您可以在我的代码中查看更改后的一个。

.code。

func swipeLeft(sender: UISwipeGestureRecognizer) {   
    // Moves masterView to the left equal to that of the width of the screen (or half of masterView's total width) 
    let moveLeftFrame = CGRect(x: -view.frame.width, y: 0, width: masterView.frame.width, height: masterView.frame.height) 

    UIView.animateKeyframes(withDuration: 0.5, delay: 0, options: .calculationModeCubic, animations: { 
     UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 0.4, animations: { 
      masterView.frame = moveLeftFrame 
     }) 
    }, completion: { (true) in 

    }) 
} 

func swipeRight(sender: UISwipeGestureRecognizer) {   
    // Moves masterView back to original location 
    let moveRightFrame = CGRect(x: 0, y: 0, width: masterView.frame.width, height: masterView.frame.height) 

    UIView.animateKeyframes(withDuration: 0.5, delay: 0, options: .calculationModeCubic, animations: { 
     UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 0.4, animations: { 
      masterView.frame = moveRightFrame 
     }) 
    }, completion: { (true) in 

    }) 
} 

开始=>