I'm creating custom transitions in my app and running into two problems. If I set the view controller to handle both UIViewControllerAnimatedTransitioning and UIViewControllerTransitioningDelegate I run into the problem of my view controller never being deallocated. Specifically, this creates the retain: self.transitioningDelegate = self; If I don't do that, and put UIViewControllerAnimatedTransit
![custom iOS 7 UIViewController transition retain cycle](https://cdn-ak-scissors.b.st-hatena.com/image/square/98d6f053a97a87156775f60757c60865d0f2c47d/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fstackoverflow%2FImg%2Fapple-touch-icon%402.png%3Fv%3D73d79a89bded)