Question

I have a group animation but I can not detect when hits animationDidStop. example of my code:

[group setDelegate:self];
[view.layer addAnimation:group forKey:@"groupAnimation"];

any of you knows how I know when the group animation is done?

Answer 1

You need to also set the animationName property to match, and ensure that your delegate function is properly defined:

CAAnimationGroup *group = [CAAnimationGroup animation];
group.duration = 2.0f;
group.delegate = self;
[group setValue:@"groupAnimation" forKey:@"animationName"];
[group setAnimations:[NSArray arrayWithObjects:myAnimation, myOtherAnimation, nil]];
[view.layer addAnimation:group forKey:@"groupAnimation"];

.
.
.

- (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)finished
{
 if (finished)
 {
  NSString *animationName = [animation valueForKey:@"animationName"];
  if ([animationName isEqualToString:@"groupAnimation"])
  {
   // your groupAnimation has ended
  }
 }
}

Please note that with group animations, the delegates set on your component animations will be ignored.