iPhone : Best way to detect the end of UIImageView image sequence animation

Question

We know that UIImageView has a very nice support for image sequence animation. We can easily create an array of UIImage objects, set the animationImages

Answer 1

I made this (method of my UIImageView subclass).

-(void)startAnimatingWithCallback:(UIImageViewAnimationCompletitionBlock) completitionCallback
{
    [self startAnimating];

    dispatch_queue_t animatingQueue = dispatch_get_current_queue();
    dispatch_queue_t pollingQueue = dispatch_queue_create("pollingQueue", NULL);
    dispatch_async(pollingQueue, ^{

        while(self.isAnimating) { usleep(10000); }
        dispatch_async(animatingQueue, ^{ if (completitionCallback) completitionCallback(); });

    });
}

Simple usage:

[self.oneView fadeOut];
[self.otherView startAnimatingWithCallback:^
{
    [self.oneView fadeIn];
}];