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开始图层动画的代码：
//mySuperLayer父图层
CFTimeInterval pausedTime = [self.mySuperLayer timeOffset];
if (pausedTime > 0)//在暂停后才能使用
{
self.mySuperLayer.speed = 1.0;
self.mySuperLayer.timeOffset = 0.0;
self.mySuperLayer.beginTime = 0.0;
CFTimeInterval timeSincePause = [self.mySuperLayer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
self.mySuperLayer.beginTime = timeSincePause;
}
暂停图层动画的代码：
CFTimeInterval pausedTime = [self.mySuperLayer convertTime:CACurrentMediaTime() fromLayer:nil];
self.mySuperLayer.speed = 0.0;
self.mySuperLayer.timeOffset = pausedTime;
例子下载：https://github.com/yoimhere/ZJLoadView/archive/master.zip
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原文地址：http://www.cnblogs.com/imhere/p/4316062.html
