Question

我需要一个项目中所有按钮的缩放弹簧动画。所以我将UIButton子类化并覆盖触摸事件函数。

import UIKit

class UIAnimatedButton: UIButton {

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {

    UIView.animateWithDuration(0.1, animations: { () -> Void in
        self.transform = CGAffineTransformMakeScale(0.8, 0.8)

    })
    super.touchesBegan(touches, withEvent: event)

}

override func touchesCancelled(touches: Set<NSObject>!, withEvent event: UIEvent!) {


    UIView.animateWithDuration(0.5,
        delay: 0,
        usingSpringWithDamping: 0.2,
        initialSpringVelocity: 6.0,
        options: UIViewAnimationOptions.AllowUserInteraction,
        animations: { () -> Void in
            self.transform = CGAffineTransformIdentity
    }) { (Bool) -> Void in
        super.touchesCancelled(touches, withEvent: event)
    }

}


override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {

    UIView.animateWithDuration(0.5,
        delay: 0,
        usingSpringWithDamping: 0.2,
        initialSpringVelocity: 6.0,
        options: UIViewAnimationOptions.AllowUserInteraction,
        animations: { () -> Void in
            self.transform = CGAffineTransformIdentity
        }) { (Bool) -> Void in
            super.touchesEnded(touches, withEvent: event)
    }
  }
}

这在快速拍摄中效果很好但是当我长按（1-2秒）触摸按钮时，我不会在内部动作事件中进行修饰。当我把它切换回普通的UIButton时，一切正常。

为什么会发生这种情况？

Answer 1

而不是在touchesCancelled和touchesEnded方法的完成块中调用super，而是在那里调用self.sendActionsForControlEvents(UIControlEvents.TouchUpInside)。

Answer 2

不确定到底是为什么，但是您需要在动画外调用super.touchesEnded(touches, with: event)

所以（迅速5）

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    UIView.animate(withDuration: 0.5,
        delay: 0,
        usingSpringWithDamping: 0.2,
        initialSpringVelocity: 6.0,
        options: UIView.AnimationOptions.allowUserInteraction,
        animations: { () -> Void in
            self.transform = CGAffineTransform.identity
        }) { (Bool) -> Void in
    }
    super.touchesEnded(touches, with: event)
}

对UIButton进行子类化并覆盖触摸事件 - 无法正常工作

2 个答案: