Swift旋转动画

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protocol RotationAnimatedProtocol {
    func startRotationAnimation()
    func stopRotationAnimation()
}

extension UIImageView: RotationAnimatedProtocol {
    func startRotationAnimation() {
        let rotationAnim = CAKeyframeAnimation(keyPath: "transform.rotation.z")
        rotationAnim.keyTimes = [0, 0.5, 0.85, 1]
        rotationAnim.values = [0, CGFloat(Double.pi), CGFloat(Double.pi) * 1.7, CGFloat(Double.pi) * 2]
        //        rotationAnim.fromValue = 0
        //        rotationAnim.toValue = Double.pi * 2
        rotationAnim.repeatCount = MAXFLOAT
        rotationAnim.duration = 3
        rotationAnim.isRemovedOnCompletion = false
        self.layer.add(rotationAnim, forKey: nil)
    }
    
    func stopRotationAnimation() {
        self.layer.removeAllAnimations()
    }
}