CABasicAnimation暂停企动

Posted 2022-11-27 博BOBO

        self.isAnimation = true
        let rotationAnimation = CABasicAnimation.init(keyPath: "transform.rotation.z")
        rotationAnimation.toValue = NSNumber(value: M_PI * 2.0)
        rotationAnimation.isRemovedOnCompletion = false  //后台不停止
        rotationAnimation.duration = 2   //时长
        rotationAnimation.isCumulative = true    
        rotationAnimation.repeatCount = MAXFLOAT;
        self.playPicImg.layer.add(rotationAnimation, forKey: "rotationAnimation")

    func isStartAnimation()
        if self.isAnimation 
            return
        
        self.isAnimation = true
        
        let pausedTime = self.playPicImg.layer.timeOffset
        self.playPicImg.layer.speed = 1.0;
        self.playPicImg.layer.timeOffset = 0.0;
        self.playPicImg.layer.beginTime = 0.0;
        
        let timeSincePause = self.playPicImg.layer.convertTime(CACurrentMediaTime(), from: nil) - pausedTime
        self.playPicImg.layer.beginTime = timeSincePause

    

    func isStopAnimation()
        if !self.isAnimation 
            return
        
        self.isAnimation = false
//        self.playPicImg.layer.removeAllAnimations()
        let pausedTime = self.playPicImg.layer.convertTime(CACurrentMediaTime(), from: nil)
        self.playPicImg.layer.speed = 0.0
        self.playPicImg.layer.timeOffset = pausedTime