Update 3/7/2013: Fully updated for iOS 6 (original post by Ray Wenderlich, update by Ellen Shapiro). This is the first part of a three-part series to help get iPhone Developers up-to-speed with iPad development by first focusing on three of the most useful classes: UISplitView, UIPopoverController, and Custom Input Views. (Jump to Part 2 or Part 3 in the series.) In this series, you’ll make an iPa