CALayer CABasicAnimation 组动画的设置，设置动画不回到初始位置

  //设置旋转
        let rotationAnimation:CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        //rotationAnimation.toValue = CGFloat(M_PI_2) * rotateCount
        rotationAnimation.fromValue = CGFloat(M_PI_2) * rotateCount
        rotationAnimation.toValue = CGFloat(M_PI_2) * (++rotateCount)
        rotationAnimation.removedOnCompletion = false
        rotationAnimation.fillMode = kCAFillModeForwards
        //设置缩放
        let scaleAnimation:CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
        if self.rotateCount % 2 == 1 {
            scaleAnimation.fromValue = 1.0
            scaleAnimation.toValue = 0.75
            scaleAnimation.duration = 1.0;

            scaleAnimation.removedOnCompletion = false
15             scaleAnimation.fillMode = kCAFillModeForwards
//设置 动画不回到起始位置，这两个要一起设置。

        }
        //设置动画组
        let animationGroup:CAAnimationGroup = CAAnimationGroup()
        animationGroup.duration = 1.0
        animationGroup.repeatCount = 0
        animationGroup.animations = [rotationAnimation,scaleAnimation]
        animationGroup.removedOnCompletion = false
        animationGroup.fillMode = kCAFillModeForwards
        //组编动画
        self.VIDEO.playerLayer.addAnimation(animationGroup, forKey: "animationGroup")

 设置视频player显示的比例按照视频本身比例显示

  func rotateAction(){
        let rotationAnimation:CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        rotationAnimation.fromValue = CGFloat(M_PI_2) * rotateCount
        rotationAnimation.toValue = CGFloat(M_PI_2) * (++rotateCount)
        let scaleAnimation:CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
        if self.rotateCount % 2 == 1 {
            scaleAnimation.fromValue = 1.0
            let boolCompare =  (self.cast.video_height / self.cast.video_width) >= 1 ? true : false
            if self.isLive() {
                if  boolCompare  {
                    scaleAnimation.toValue = (self.VIDEO.width) / (self.VIDEO.height)
                } else {
                    scaleAnimation.toValue = (self.VIDEO.height) / (self.VIDEO.width)
                }
            } else if !self.isIpadCompact(){
                if  boolCompare  {
                    scaleAnimation.toValue = (self.VIDEO.width) / (self.VIDEO.height)
                } else {
                    scaleAnimation.toValue = (self.VIDEO.height) / (self.VIDEO.width)
                }
            } else {
                var ratio = (self.VIDEO.height) / (self.VIDEO.width)
                if ratio > 2 {
                    ratio = 1.8
                } else if ratio > 1 {
                    ratio = 1.65
                }
                scaleAnimation.toValue = ratio
            }
            scaleAnimation.duration = 0.2;
        }
        let animationGroup:CAAnimationGroup = CAAnimationGroup()
        animationGroup.duration = 0.2
        animationGroup.repeatCount = 0
        animationGroup.animations = [rotationAnimation,scaleAnimation]
        animationGroup.removedOnCompletion = false
        animationGroup.fillMode = kCAFillModeForwards
        self.VIDEO.playerLayer.addAnimation(animationGroup, forKey: "animationGroup")
    }