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navigation bar is displayed along a window s top, just below the status bar The navigation bar optionally contains a title for each view displayed and one or more buttons Typically, the button on the bar s right, when clicked, takes the user to the next step in another view, although sometimes applications use the right button as a done button The button on the bar s left is a Back button, returning to the previous view Navigation bars are often used with tables, where a table is displayed with a navigation bar above it When a user clicks a table s rows, the navigation bar s associated navigation controller takes the user to more detailed information about the selected item For instance, the App Store application allows a user to refine his or her categories until the application of interest is found (Figure 9-1) For instance, if a user clicked Games, the navigation controller would take the user to a Games subcategory If the user then clicked All Games, the navigation controller would take the user to a table of all games in the App Store If a user wished to go back a step, he or she would press the button on the navigation bar s upper-left area This button is the Back button Note the navigation controller labeled the button s title with the previous view s title The navigation bar and navigation controller are useful for applications requiring hierarchical navigation, such as data drill-down In the App Store application, you drill down to increasingly specific categories until reaching a list of items rather than further subcategories When you select an item, it takes you to a more detailed view of your selection Navigation bars are also useful for applications with multiple steps in a single task In this chapter, you learn how to use a navigation bar and its associated classes In the first task, you start with a Window-based application and manually create an application consisting of three views managed by a navigation controller In the second task, you look at how the Utility Application template uses a navigation bar This template uses a navigation bar on only one view and without using an associated navigation controller Finally, this chapter presents a navigation controller embedded in a tab bar s tab This is perhaps this chapter s most useful task and should not be skipped You will find embedding a navigation controller in a tab a ubiquitous requirement when developing iOS applications.

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nontax entities The federal corporate tax rate is approximately 35%, depending on net income State corporate tax

9:

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Figure 9-1

rates vary When precision is important, this number should be tailored to the relevant tax rate for your state

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Below the status bar but above the application window s content, many applications have a navigation bar Navigation bars display the current view s title and contain one or more buttons for navigating to other screens In this chapter s introduction, you viewed the App Store application, a typical use for a navigation bar The Notes application also uses a navigation bar (Figure 9-2) The navigation bar appears above the yellow notepad Upon clicking the + key, the navigation bar displays a new note page The navigation bar s title is New Note and contains a back button labeled Notes and a right button labeled Done When the user taps either button, the application returns the user to the application s primary page You add navigation bars to an application using the UINavigationBar class, but you almost never use a UINavigationBar class directly Instead you ll use UINavigationBar s controller, UINavigationController You control a UINavigationBar using a UINavigationController A UINavigationController uses a stack data structure to manage one or more view controllers The first view controller, or the root view controller, is the first item on the stack To navigate to other views, you push the view s view controller onto the stack To return to the previous view, you pop the current view from the stack

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Figure 9-2

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[2] The percentages equal 1/15, 2/15, 3/15, 4/15, and 5/15, respectively when working with five years of historical data

Q: A:

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What is a stack A stack is a data structure used to hold a collection of objects You can only add or remove objects from the stack s top Envision a stack of plates: You add plates to the top and remove plates from the top Removing from the bottom would cause the plates to topple and break The stack data structure has the same LIFO (last in first out) requirements Placing a new item on the stack is called pushing, while removing an item from the stack is called popping

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It is easiest to learn the UINavigationController by example In this task, you create a simple application containing three views You navigate between the three views using a navigation bar The first view has a button on the navigation bar s right, which says Next When you click the button, the application takes you to the next view This view has a Back button and a button in the view rather than on the navigation bar When you click the button in the view, the application takes you to a third view The third view has a navigation bar and a title

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