Update 3/7/2013: Fully updated for iOS 6 (original post by Ray Wenderlich, update by Ellen Shapiro). This is the third part and final part of a three-part series to help get iPhone Developers up-to-speed with iPad development by focusing on three of the most useful classes: UISplitView, UIPopoverController, and Custom Input Views. In the first part of the series, you made an app with a split view