Question

我仍然对Swift相当新鲜。我想知道如何在执行函数之外的swift中终止动画功能。在下面的情况下，我运行动画15秒，但只要用户按下某个按钮，我希望动画停止，元素消失。关于最佳方式的任何想法？这是功能。

func createTimerAnimation () {
    // create timer line shapes

    guard self.timerisActive else {

        print("in guard 1")
        return
    }

    let screenWidth = (self.view.bounds.width)
    let screenHeight = (self.view.bounds.height)

    let timerShapeLeft = drawTimerShape()
    let timerShapeRight = drawTimerShape()
    let timerShapeCenter = drawTimerShape()

    view.addSubview(timerShapeLeft)
    view.addSubview(timerShapeRight)
    view.addSubview(timerShapeCenter)

UIView.animate(withDuration: 14.5, delay: 0.0, options: [.curveEaseOut], animations:{
            timerShapeLeft.frame = CGRect (x: (screenWidth / 2), y: (screenHeight - 60), width: timerShapeLeft.frame.width, height: (timerShapeLeft.frame.height - 30))
            timerShapeRight.frame = CGRect (x: (screenWidth / 2), y: (screenHeight - 60), width: timerShapeRight.frame.width, height: (timerShapeRight.frame.height - 30))
            timerShapeCenter.frame = CGRect (x: (screenWidth / 2), y: (screenHeight - 60), width: timerShapeCenter.frame.width, height: (timerShapeCenter.frame.height))
            timerShapeLeft.alpha = 1.0
            timerShapeRight.alpha = 1.0
            timerShapeCenter.alpha = 0.4
            timerShapeLeft.tintColor = self.hexGray
            timerShapeRight.tintColor = self.hexGray

            guard self.timerisActive else {

                print("in guard 1")
                return
            }

Answer 1

动画实际上是由视图的图层处理的，因此您可以使用CALayer.removeAllAnimations()取消动画：

view.layer.removeAllAnimations()

Swift：如何在函数执行之外终止函数

1 个答案: