Chapter 6. Popovers
Up until recently, the iOS user interface paradigm supported showing only a limited amount of material on the screen at any point in time. In a Cocoa Touch application, there's typically one view controller in focus at a time, and that view controller is in charge of the whole screen (or most of it). The notable exceptions are classes like UINavigationController and UITabBarController, which don't display any interesting content on their own, but instead help developers organize other view controllers.
On the small screen of the iPhone and the iPod touch, this makes a lot of sense. Instead of a profusion of tiny widgets fighting for space on the screen, iOS users have gotten used to being able to focus on one thing at a time, ...
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