Layer动画的停止和恢复

自己写了2个方法，分别调用它们来实现layer层动画的暂停和恢复动画，




//动画的暂停实现方法

-(void)pauseLayer:(CALayer*)layer

{

    CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];

    layer.speed = 0.0;

    layer.timeOffset = pausedTime;

}




//动画的恢复方法

 

-(void)resumeLayer:(CALayer*)layer

{

    CFTimeInterval pausedTime = [layer timeOffset];

    layer.speed = 1.0;

    layer.timeOffset = 0.0;

    layer.beginTime = 0.0;

    CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;

    layer.beginTime = timeSincePause;

}







如果在一个view中添加了多个动画，（不是组合动画），同样容易实现动画的暂停、恢复，方法就是为每个动画层layer调用上面的方法，比如我的方法如下，我用的是三个单独动画的组合效果，就是如下调用的





-(void)stopAnimation;

{

    NSLog(@"停止动画");

    //[_customView.layer removeAllAnimations];

    [self pauseLayer:_customView1.layer];

    [self pauseLayer:_customView2.layer];

    [self pauseLayer:_customView3.layer];

}

 

-(void)resumeAnimation

{

    [self resumeLayer:_customView1.layer];

    [self resumeLayer:_customView2.layer];

    [self resumeLayer:_customView3.layer];

 

}