Objective C: Bending images

I want to take 开发者_如何学Goan image and have the user bend it and take it apart. I've been searching for a while and can't find anything similar to the idea. Any suggestions appreciated!

---

For bending(like Curl effect),use

[UIImageView transitionFromView:image1 toView:image2 duration:1 options:UIViewAnimationOptionTransitionCurlUp completion:NULL];

in any gesture.