Question

我有一个名为RippleButton的自定义UIButton声明如此

public class RippleButton: UIButton

基本上它会在触摸时产生连锁效果。我正在使用此自定义按钮以及以下IBAction

@IBAction func toggleMic() {
    if isMicrophoneOn {
        print("Stopped recording")
        micIcon.image = UIImage(named: "mic_off")
        micLabel.text = "Start Recording"
    } else {
        print("Started recording")
        micIcon.image = UIImage(named: "mic_on")
        micLabel.text = "End Recording"
    }

    isMicrophoneOn = !isMicrophoneOn
}

通过Touch Up Inside事件的设计编辑器将操作分配给按钮。

我的RippleButton覆盖了touchesBegan，就像这样

override public func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesBegan(touches, with: event)
    ripple.animate(sender: self, location: touches.first!.location(in: self))
}

当我第一次点击按钮触发IBAction并从我的班级Ripple中播放动画时

func animate(sender: UIView, location: CGPoint){        
    ripple?.transform = CGAffineTransform(scaleX: 1, y: 1)
    let size = Double(sender.bounds.width) > Double(sender.bounds.height) ? sender.bounds.width : sender.bounds.height
    ripple?.frame = CGRect(x: location.x - size / 2, y: location.y - size / 2, width: size, height: size)
    ripple?.layer.cornerRadius = size / 2.0
    ripple?.alpha = CGFloat(opacity)
    ripple?.backgroundColor = color
    ripple?.transform = CGAffineTransform(scaleX: 0, y: 0)
    container?.frame = CGRect(x: 0, y: 0, width: sender.frame.size.width, height: sender.frame.size.height)
    container?.layer.cornerRadius = sender.layer.cornerRadius
    container?.clipsToBounds = true

    UIView.animate(withDuration: TimeInterval(speed),
                   delay: 0.0,
                   options: .curveEaseOut,
                   animations: {
                    self.ripple?.transform = CGAffineTransform(scaleX: 2.5, y: 2.5)
                    self.ripple?.alpha = 0.0
    })
}

ripple是添加到container的子视图，container是添加到RippleButton的视图

当我在第一次触摸后触摸动画播放时，但IBAction不会触发。它为什么会发射一次，然后再发射一次？

Answer 1

你说＆＃34; ripple是添加到容器的子视图，容器是添加到RippleButton的视图＆＃34; ...你是否在＆＃34; ripple＆＃34;之后删除了该容器？影响？也许那是在接触触摸事件。

Answer 2

默认情况下，通过调用self.sendActionsForControlEvents触发touchesEnded中的操作。尝试覆盖touchesEnded和touchesCancelled（使用超级调用）并在两者中设置断点。也许这个活动第二次会被取消。在这种情况下，您的动画会以某种方式干扰内部按钮状态实现。这很难解决，因为UIButton是一个黑盒子，更糟糕的是它的内部实现可能会改变。那么你应该从UIControl派生出来。

请查看：4 different ways to handle tap

自定义UIButton会激活IBAction一次，然后再次激活

2 个答案: