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The UISplitViewController is an iPad-specific controller that provides a way of controlling two side-by-side views:typically, the controller on the left-hand side shows a list of items in a UITableView, and the right-hand side shows a detail view relating to the selected item in the table.
Probably most familiar landscape split-view controller is to be found in the Mail app (Figure 11-1).
Figure 11–1. The iPad's Mail app, an example of a landscape split-view controller
In landscape orientation, the two views are shown side by side. When the iPad rotates into portrait orientation, the left-hand list view disappears, and the detail view fills the screen (Figure 11-2).
Figure 11–2. The Mail app in portrait orientation; the message fills the full screen.