ios - 图像移过后按钮会改变吗？

Question

我正在制作一个“滑动确认”按钮，设置是自定义 UIButton + 常规 UIImageView，图像被传递到按钮，按钮监听触摸并相应地移动图像。 一切都很好，除了按钮释放后的一个细节外，一切都应该回到初始状态，但按钮保持变化，就好像它的 alpha 减半一样

我评论了 alpha，因为该按钮将要隐藏，但是一旦我遇到这个问题，我就禁用了它，无论是否设置 alpha，问题都会发生。

这是自定义按钮的代码

class SlideButton: UIButton {

    var arrowImage: UIImageView?
    var initialLocation: CGPoint?
    var initialArrowPosition: CGPoint?

    func setArrow(arrow:UIImageView){
        arrowImage = arrow
        initialArrowPosition = arrow.frame.origin
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        let touch = touches.first!
        let location = touch.location(in: self.superview)
        initialLocation = location
        UIView.animate(withDuration: 0.2) {
            //self.alpha = 0.0
          }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        UIView.animate(withDuration: 0.3) {
            self.arrowImage!.frame.origin = self.initialArrowPosition!
            //self.alpha = 1.0
        }
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        let touch = touches.first!
        let currentLocation = touch.location(in: self.superview)
        arrowImage!.frame.origin.x = initialArrowPosition!.x - initialLocation!.x + (currentLocation.x)
    }
 }

Answer 1

您要记得为您的touches 方法之一调用super:

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesBegan(touches, with: event)

但对于其他 touches 方法，您忘记了这样做，因此您破坏了按钮的核心功能。