ios - cabasicanimation need to reset - ios

Question

I have 3 CABasicAnimation of 3 color bars which is following each other. After the third is completed, 3 bars will stay at their final position. Until here, everything is good, here is the code:
- (void)animationDidStop:(CABasicAnimation *)theAnimation finished:(BOOL)flag {
NSString* value = [theAnimation valueForKey:#"id"];
if([value isEqualToString:#"position1"]){
[self playVideoAtIndex:1];
}
else if([value isEqualToString:#"position2"]){
[self playVideoAtIndex:2];
}
else if([value isEqualToString:#"position3"]){
}
}
Before that, I created 3 animations like this:
-(void)createAnimationAtIndex:(NSInteger)index{
UILabel *label = (UILabel *)[barLabelArray objectAtIndex:index];
if(index==0){
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"position"];
animation.delegate = self;
//SOMETHING HERE
[label.layer addAnimation:animation forKey:#"position1"];
}
else if(index==1){
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"position"];
animation.delegate = self;
//SOMETHING HERE
[self.delegate startPlayVideoAtIndex:1];
[label.layer addAnimation:animation forKey:#"position2"];
}
else if(index==2){
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"position"];
animation.delegate = self;
//SOMETHING HERE
[label.layer addAnimation:animation forKey:#"position3"];
}
}
So if I wait until all animations stop, when I come back, they will start animation properly again. But sometimes I need stoping the animation in the middle of it. And then when I come back and start the animation again, all is messed up. Here is code for stoping animations:
-(void)reset{
for(UILabel *label in barLabelArray){
[label.layer removeAllAnimations];
}
}
So do you know what I am doing wrong here and how to fix it? Thank you !!

Answer 1

There is a way pause and resume any animations. Here is several good strings which can help you if I understand correctly
- (void) pauseLayer
{
CFTimeInterval pausedTime = [label.layer convertTime:CACurrentMediaTime() fromLayer:nil];
label.layer.speed = 0.0;
label.layer.timeOffset = pausedTime;
}
- (void) resumeLayer
{
CFTimeInterval pausedTime = [label.layer timeOffset];
label.layer.speed = 1.0;
label.layer.timeOffset = 0.0;
label.layer.beginTime = 0.0;
CFTimeInterval timeSincePause = [label.layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
label.layer.beginTime = timeSincePause;
}