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UITabBar and UITabBarController
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Understanding tab bars Using the Tab Bar Application template Creating an application that uses a tab bar Adding tabs to a tab bar Customizing a tab bar
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tab bar consists of two or more tabs along a window s bottom Each tab contains a view controller As a user selects a tab, the tab loads its view controller, which in turn loads and displays its associated view In this chapter, you explore creating tabbed applications In the first task, you create a tabbed application using Xcode s Tab Bar Application template After examining this template s results, you manually add a third tab to the tab bar In the next task, you start with a Window-based Application template and create a two-tab application In this task, you solidify your understanding by manually duplicating the steps taken by the Tab Bar Application template The chapter s final task illustrates allowing users to customize a tab bar s tabs when it contains five or more tabs
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The tab bar is useful for presenting different application subtasks or different views of the same data If you own an iPhone, iPod touch, or iPad, you are certainly familiar with a tab bar controller, as several applications use tab bars The Clock application, for instance, has a tab bar containing tabs with different subtasks (Figure 8-1) Each tab is a different subtask: World Clock, Alarm, Stopwatch, and Timer The iPod application illustrates a tab bar containing different views of the same data (Figure 8-2) The Artists tab organizes your multimedia by artist; the Album tab organizes your media by album Each tab is a different view of the same data, your iTunes multimedia The iPod application illustrates another tab bar feature When a tab bar has more than four tabs, it displays a More tab When you press More, the tab bar presents the remaining tabs in a selectable list (Figure 8-3) You can also modify the iPod application s tab bar using the Edit button Clicking the Edit button displays the tabs in a view that allows you to modify which tabs are displayed in the tab bar (see Figure 8-3) When presented with an application that contains a task with multiple subtasks or an application that requires different views of the same data, use a tab bar
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The Clock application has a tab for each subtask
Figure 8-2
The iPod application has a tab for each data view
iOS SDK Programming: A Beginner s Guide
Figure 8-3
The iPod application uses a More tab to display tabs
NOTE
Do not use a tab bar for sequential navigation or data drill-down The navigation control and tables (described in the next two chapters) are more appropriate choices for navigating sequential lists and data drill-down
You create a tab bar using the UITabBar class A UITabBar displays two or more tabs along a window s bottom edge Individual tabs are UITabBarItem class instances You tie these classes together using the UITabBarController and UITabBarControllerDelegate Each UITabBarItem contains its own view controller Click a tab, and the UITabBarItem loads its view controller The view controller displays its view
NOTE
A tab s view controller might be an advanced view, like a table or a navigation controller 9 illustrates placing a navigation controller in a tab 10 illustrates placing a navigation controller in a tab and then a table in the navigation controller
A UITabBar has an associated UITabBarController and UITabBarDelegate The UITabBarController manages the UIViewController objects in each tab For instance, if a user wishes to add, remove, or rearrange tab bar items, the UITabBarController is responsible for implementing the behavior You will see how to accomplish a rearrangeable tab bar later in this chapter But first, consider the easiest tab bar implementation: the Tab Bar Application template
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