ios - 如何暂停 UIView 动画

Question

在 iOS5.0 中使用 block ，假设我们有一个 UIViewAnimationOptionAutoreverse 动画，并且需要在反向动画开始之前放置一个延迟。我们该怎么做？

感谢您对此的帮助

Answer 1

The best way to pause and resume animation :

add QuartzCore framework 


then use the following apple's code 

-(void) pause
{

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

    obj.layer.speed = 0.0;

    obj.layer.timeOffset = pausedTime;
}


-(void) resume
{

CFTimeInterval pausedTime = [obj.layer timeOffset];

    obj.layer.speed = 1.0;

    obj.layer.timeOffset = 0.0;

    obj.layer.beginTime = 0.0;

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

    obj.layer.beginTime = timeSincePause;


}