如何在ios中運用core animation暫停和繼續動畫

核心代碼如下


//暫停layer上面的動畫
- (void)pauseLayer:(CALayer*)layer
{
    CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
    layer.speed = 0.0;
    layer.timeOffset = pausedTime;
}


//繼續layer上面的動畫
- (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;
}



可到技術博客上詳細應用：
blog.csdn.net/gckjdev/article/details/7177840

描述:滾動中
圖片:moving.png 

描述:暫停時
圖片:pause.png 

描述:Demo工程
附件:  AnimationPause.zip