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The Complete Idiot's Guide® To iPad and iPhone App Development by Troy Brant

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Intro to Tab Bar Controllers

A tab bar controller presents a list of tabs at the bottom of the application view. Each tab corresponds to a single view controller, which is loaded and displayed when the user selects the tab. For example, see the App Store app, which uses a tab bar controller to organize its views:
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Each tab corresponds to a different view controller.
For iPhone apps, the maximum number of tabs a tab bar can display is five. For iPad apps, the maximum is seven tabs. If you have more than the maximum, the tab bar controller will automatically display a “More” tab, which lists the rest of the items. You will see exactly how this ...

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