Pause and resume CALayer's animation

gistfile1.txt

- (void)pauseLayer:(CALayer *)layer {
    CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
    layer.speed = 0.0f;
    layer.timeOffset = pausedTime;
}

- (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;
}