How to implement method: - (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag

Question

I have two blocks of code (described also in another topic)

- (void)AnimateImage:(NSString*)direction{
    self.CurrentAnimal.image = [images objectAtIndex:image_nr];
    CATransition *animation = [CATransition animation];
    [animation setDuration:1.0];
    [animation setType:kCATransitionPush];
    if([direction isEqualToString:@"left"]){
        [animation setSubtype:kCATransitionFromLeft];
    }
    else {
        [animation setSubtype:kCATransitionFromRight];
    }
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]];
    [[self.CurrentAnimal layer] addAnimation:animation forKey:nil];
}

And

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
    //do what you need to do when animation ends...
}

I know that I need to "set the delegate property and implement the method" to catch animationDidStop event but I'm not able to get it working.

Question - How do I set up my .h and .m files so that I'm able to use this method to execute code when CATransition animation stops?

Answer 1

Set up the delegate:

CATransition *animation = [CATransition animation];
....
[animation setDelegate:self];
[animation setDuration:1.0];
[animation setType:kCATransitionPush];

Answer 2

You first have to add the Delegate to the CATransition object you created like that

CATransition *animation = [CATransition animation];
[animation setDelegate = self]; 
[animation setValue:animation.values.lastObject forKey:@"myAnimationKey"];

If you set a key for your animation, you can exactly check which animation ended. If you have just one animation, you don't need a specific key. If you set a key you can check which animation ended like that:

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{

    if(anim == [animation.layer animationForKey:@"myAnimationKey"]){

    }
}