平稳加速运行中的旋转动画 [英] Smoothly speed up an running rotation animation

问题描述

我使用以下代码旋转任何视图：

I use this code to rotate any view:

func rotateAnimation(theView: UIView, duration: CFTimeInterval = 20.0, repeatCount: Float = 200, toValue: CGFloat = CGFloat(.pi * 2.0)) {
    let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
    rotateAnimation.fromValue = 0.0
    rotateAnimation.toValue = toValue
    rotateAnimation.duration = duration
    rotateAnimation.repeatCount = repeatCount
    theView.layer.add(rotateAnimation, forKey: nil)
}

我想知道如何加快当前正在运行的动画的速度。例如，如果某个UIView随上面的代码一起旋转，那么如何通过一个不错的转换使该速度快两倍？

I would like to know how to speed up that currently running animation. If for example an UIView is rotating with the code above, how can I make that speed go twice as fast with a nice transation?

所以：调用rotationAnimation ：以正常速度旋转-> 调用功能？ -> UIView将平滑地旋转到所需速度更快-> UIView将继续以所需速度旋转。

So: calls rotateAnimation: rotating at normal speed -> calls ?function? -> UIView will smoothly go spinning faster to desired speed -> UIView will keep spinning at desired speed.

谢谢您的帮助。

推荐答案

请尝试下面的代码

       let timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { (timer) in
            self.viewToMove.layer.timeOffset = self.viewToMove.layer.convertTime(CACurrentMediaTime(), from: nil)
            self.viewToMove.layer.beginTime = CACurrentMediaTime()
            self.viewToMove.layer.speed += 0.5

        }
        timer.fire()

它将非常平滑地提高动画速度

It will Increase Animation speed very smoothly

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