The control, FRLayeredNavigationController was inspired by the layered navigation found in the Twitter and Soundcloud apps. The API is extremely similar to the UINvaigationController in that you just push and pop your views from a stack.
Here’s a demo from a real app showing the iOS control in action:
Here’s a video from the control’s creator showing the
You can find the control from factis Research on Github here.
You can read more about the control on the factis Research blog here.
A really nice iPad navigation control that is easy to use.