如何重置 Swift 中的循环进度条？

Question

我在Swift中创建了一个圆形进度条。我可以开始、暂停和恢复动画，但我需要能够通过点击按钮重置动画。

这是我用来启动、暂停和恢复动画的代码。重置它还需要哪些额外步骤？

func startAnimation() {
    let basicAnimation = CABasicAnimation(keyPath: "strokeEnd")
    basicAnimation.toValue = 1
    basicAnimation.duration = seconds
    basicAnimation.fillMode = CAMediaTimingFillMode.forwards
    basicAnimation.isRemovedOnCompletion = false
    shapeLayer.add(basicAnimation, forKey: "basicAnime")
}

func pauseLayer(layer: CALayer){
    let pausedTime : CFTimeInterval = layer.convertTime(CACurrentMediaTime(), from: nil)
    layer.speed = 0.0
    layer.timeOffset = pausedTime
}

func resumeAnimation(layer: CALayer){
    let pausedTime = layer.timeOffset
    layer.speed = 1.0
    layer.timeOffset = 0.0
    layer.beginTime = 0.0
    let timeSincePause = layer.convertTime(CACurrentMediaTime(), from: nil) - pausedTime
    layer.beginTime = timeSincePause
}

func resetAnimation() {
    timer.invalidate()
    
    // next steps
}

Answer 1

一种可能的解决方案是简单地删除之前添加的动画

有关详细信息，请参阅 CALayer#removeAllAnimations() and CALayer#removeAnimation(forKey:)

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