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Creating advanced view controllers
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Figure 7.4 A navigation controller contains at least four objects and may be built into a complex web of interconnections.
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much like the tab bar controller, and you ll see familiar elements, such as the title of the view controller creating the title within the navigator. The biggest difference is that whereas the tab bar controller presents a modal paradigm, entirely organized by the controller, the navigation controller creates a hierarchical paradigm. The navigation controller doesn t have any particular sense of the organization of the entire structure. Instead, a linked list is created, with each navigation item knowing only about the pages on either side of it.
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A note on table views
The standard device paradigm is to do hierarchical navigation through table views, each of which contains lists of many different subpages that you can go to. As a result, despite the fact that any UIViewController can sit beneath a UINavigationController, it s usually a UITableViewController. This is exactly the setup you see in the navigation-based template.
Creating a navigation controller
To create a navigation controller, create a new project (in this example, called navex) using the Navigation-Based Application template. You can page through the .xib file and the Xcode listing to see what you re given. Let s start with the .xib files, whose content you can see in figure 7.5. Mainwindow.xib contains a UINavigationController in the nib window with a UINavigationBar hidden under it. The main display window contains a UINavigationItem and a RootViewController. The latter is a subclass of UIViewController created through Xcode, just as when you designed your own table controller in chapter 5. Note that this sets up the standard iPhone paradigm of navigation controllers being built atop table controllers. The table view controller s contents are instantiated through a second .xib file, RootViewController.xib, as shown in the table view controller s attributes window.
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The navigation controller
Figure 7.5 The Navigation-Based Application template contains two .xib files: one for the main view (left) and one for what appears inside the controller (right).
RootViewController.xib is a boring .xib file because it contains only a table view. Consider it a good example of how pairing .xib files with view controllers can keep your program well organized. Finally, if you look at the Xcode files created by the template, you see that the navigation controller is linked to your window in the app delegate file. Among the other default files are the RootViewController class files you d expect to see. Because you re working with a table view controller, you know the RootViewController class files will be important when you input the table view s data.
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Creating advanced view controllers
Completing the navigation controller
At this point, you need to do three things to complete the navigation controller: add a title, add navigation links, and (optionally) add action buttons.
ADDING A TITLE
Like the tab bar controller, the navigation controller takes its title from the title of the individual page s view controller. All you have to do is define title in your table view controller file:
self.title = @"Color List";
This turns out to be a critical bit of data, because it s also what the navigation controller uses as a Back button when you re deeper in the hierarchy.
ADDING THE LINKS
You could theoretically use whatever method you wanted to link to additional pages via a navigational controller. The default mechanism is to use a table list, and that s the method you ll use in this example. Design your table view controller as discussed in chapter 5, but this time give each table cell an accessory view of type UITableViewCellAccessoryDisclosureIndicator. That s the standard chevron used to indicate hierarchical navigation. Listing 7.2 includes all the major elements required to define this navigation table in RootViewController.m.
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