- (void)idl_stopLayerAnimation {
    CFTimeInterval pauseTime =[self convertTime:CACurrentMediaTime() fromLayer:nil];
    self.speed = 0.0f;
    self.timeOffset = pauseTime;
}

- (void)idl_resumeLayerAnimation {
    CFTimeInterval pauseTime = self.timeOffset;
    self.speed = 1.0f;
    self.timeOffset = 0.0f;
    self.beginTime = 0;
    CFTimeInterval timeSince = [self convertTime:CACurrentMediaTime() fromLayer:nil] - pauseTime;
    self.beginTime = timeSince;
}