There's not yet much sample code knocking around for iOS 7 custom transitions yet: I guess that NDA is still only freshly lifted.
This is a simple example of how to present a new
UIModalPresentationCustom-type Modal UIViewController with a
UIViewControllerTransitioningDelegate managing the show. Have a play with it, I hope it helps.
Other useful resources:
- WWDC Session 218 Video: "Custom Transitions using View Controllers". Consider this required viewing! (requires Apple Developer account, unfortunately.)
- PMInteractiveNavigationController Interactive navigation controller pop gesture.
- TransitionsCodeLab more complex example of what's possible with custom transitions in using UICollectionView.
- iOS 7: Custom Transitions - genesis of my example code.