开始/停止图像视图旋转动画 [英] Start/stop image view rotation animations

问题描述

我有一个开始/停止按钮和一个要旋转的图像视图.

I have a start/stop button and an image view which I want to rotate.

当我按下按钮时，我要开始旋转，而当我再次按下按钮时，图像应停止旋转.我目前正在使用UIView动画，但是我还没有想出一种方法来停止查看动画.

When I press the button I want the to start rotating and when I press the button again the image should stop rotating. I am currently using an UIView animation, but I haven't figured out a way to stop the view animations.

我希望图像旋转，但是当动画停止时，图像不应回到起始位置，而应继续动画.

I want the image to rotate, but when the animation stops the image shouldn't go back to the starting position, but instead continue the animation.

var isTapped = true

    @IBAction func startStopButtonTapped(_ sender: Any) {
       ruotate()
       isTapped = !isTapped
    }

    func ruotate() {
        if isTapped {
            UIView.animate(withDuration: 5, delay: 0, options: .repeat, animations: { () -> Void in
            self.imageWood.transform =     self.imageWood.transform.rotated(by: CGFloat(M_PI_2))
            }, completion: { finished in
            ruotate()
            })
    }  }

这是我的代码，但无法按我的方式工作.

It is my code, but it doesn't work like I aspect.

推荐答案

Swift 3.x

开始动画

let rotationAnimation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
    rotationAnimation.toValue = NSNumber(value: .pi * 2.0)
    rotationAnimation.duration = 0.5;
    rotationAnimation.isCumulative = true;
    rotationAnimation.repeatCount = .infinity;
    self.imageWood?.layer.add(rotationAnimation, forKey: "rotationAnimation")

停止动画

self.imageWood?.layer.removeAnimation(forKey: "rotationAnimation")

Swift 2.x

开始动画

let rotationAnimation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
    rotationAnimation.toValue = NSNumber(double: M_PI * 2.0)
    rotationAnimation.duration = 1;
    rotationAnimation.cumulative = true;
    rotationAnimation.repeatCount = .infinity;
    self.imageWood?.layer.addAnimation(rotationAnimation, forKey: "rotationAnimation")

停止动画

self.imageWood?.layer.removeAnimation(forKey: "rotationAnimation")

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