Raizlabs/RZSegmentViewController — pull request #6 by arrouse (2013-11-05 20:42:38+00:00)
Title: Adding Custom transitions to RZSegmentViewController

This allows the user to create their own UIViewControllerAnimatedTransitioning object and apply it to the SegmentViewController.

The Demo project is updated but you must update the target to point to iOS7+ only to get it to have the animations.
I'll update the readme to mention this if this gets merged in.