点击手势动画UIView无法正常工作 [英] Tap Gesture on animating UIView not working

问题描述

我在UILabel上有一个轻击手势，他的翻译正在动画中。每当您在动画期间点击标签时，点击手势都没有响应。

I have a tap gesture on a UILabel who's translation is being animated. Whenever you tap on the label during the animation there's no response from the tap gesture.

这是我的代码：

    label.addGestureRecognizer(tapGesture)

    label.userInteractionEnabled = true
    label.transform = CGAffineTransformMakeTranslation(0, 0)

    UIView.animateWithDuration(12, delay: 0, options: UIViewAnimationOptions.AllowUserInteraction, animations: { () -> Void in
        label.transform = CGAffineTransformMakeTranslation(0, 900)
        }, completion: nil)

手势代码：

func setUpRecognizers() {
    tapGesture = UITapGestureRecognizer(target: self, action: "onTap:")
}
func onTap(sender : AnyObject) {
    print("Tapped")
}

任何想法？谢谢：）

推荐答案

出于一个重要原因，使用tapgesture后你将无法完成你的目标。 tapgesture与标签的框架相关联。开始动画时，标签最终帧会立即更改，而您只是在观看假电影（动画）。如果您能够在屏幕上触摸（0,900），则会在动画发生时正常触发。有一种方法可以做到这一点有点不同。最好的方法是使用touchesBegan。这是我刚刚编写的用于测试我的理论的扩展，但可以根据您的需要进行调整。例如，您可以使用实际的子类并访问标签属性而无需循环。

You will not be able to accomplish what you are after using a tapgesture for 1 huge reason. The tapgesture is associated with the frame of the label. The labels final frame is changed instantly when kicking off the animation and you are just watching a fake movie(animation). If you were able to touch (0,900) on the screen it would fire as normal while the animation is occuring. There is a way to do this a little bit different though. The best would be to uses touchesBegan. Here is an extension I just wrote to test my theory but could be adapted to fit your needs.For example you could use your actual subclass and access the label properties without the need for loops.

extension UIViewController{

public override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    guard let touch = touches.first else{return}
    let touchLocation = touch.locationInView(self.view)

    for subs in self.view.subviews{
        guard let ourLabel = subs as? UILabel else{return}
        print(ourLabel.layer.presentationLayer())

        if ourLabel.layer.presentationLayer()!.hitTest(touchLocation) != nil{
            print("Touching")
            UIView.animateWithDuration(0.4, animations: {
                self.view.backgroundColor = UIColor.redColor()
                }, completion: {
                    finished in
                    UIView.animateWithDuration(0.4, animations: {
                        self.view.backgroundColor = UIColor.whiteColor()
                        }, completion: {
                            finished in
                    })
                })
            }
        }

    }
}

你可以看到它正在测试CALayer.presentationLayer（）的坐标。这就是我所说的电影。说实话，我仍然没有完全围绕表示层及其工作原理。

You can see that it is testing the coordinates of the CALayer.presentationLayer()..That's what I was calling the movies. To be honest, I have still not wrapped my head completely around the presentation layer and how it works.

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