vb.net print barcode labels NAVIGATING BACKWARD in Objective-C

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CHAPTER 7 NAVIGATING BACKWARD
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Creating advanced view controllers
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After you ve loaded a new page onto a navigation controller s stack, it appears with all the peripherals you d expect, including a titled navigation bar with a titled Back button (each based on the title property of the appropriate controller). This is all shown in figure 7.7. You also don t have to worry about coding the backward navigation. Clicking the Back button automatically pops the top controller off the stack without any work on your part.
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OTHER TYPES OF NAVIGATION
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Navigation doesn t have to be just forward and backward. You can also do some slightly more complex things, either during setup or at runtime. At setup, you can create a navigational hierarchy and push a user into it before they take any actions. You can see this in action in various iPhone programs. Mail always returns you to the last mailbox you were at, whereas Contacts always gives you a Back button to return to the Groups page. You can do fancy things during runtime using three navigation controller methods: popToRootViewCon- Figure 7.7 With a few simple trollerAnimated: (which brings you back to the top of commands, a navigation your stack), popToViewController:animated: (which controller s setup is largely automated. Here you see the returns you to a specific view controller), and popView- titled navigation bar with a titled ControllerAnimated: (which pops the top controller Back button. off the stack). They re powerful, although you have to take care when changing the standard navigation paradigm so you don t confuse your users. But, for example, you could place a UIBarButtonItem in your nav bar that returns you to home from deep in your hierarchy. Alternatively, you might pop the top page automatically after a user takes some action on the page that concludes its usefulness.
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NAVIGATORS AND DATABASES
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So far, you ve built all your table view controllers including the one embedded in this navigation controller using arrays. This is a perfectly acceptable technique for a small, static table. But if you want a bigger or a more dynamic table, you ll probably want to use a database as your data back end. We ll present a complete example of how to do so in chapter 9, when we cover the SQLite database package.
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OTHER METHODS AND PROPERTIES
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There s little else to be done with the navigation controller, although you can find a few other properties in the class reference. You can set those properties to modify the look of individual UIBarButtonItems and to set your nav bar to be hidden.
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Using the flipside controller
We ve now covered the two most important advanced view controllers. But before we finish our discussion of the topic, let s take a brief look at the flipside controller, which exists only as a template, not as a class in the UIKit framework. The template instead creates a subclass of ViewController in your program.
Using the flipside controller
MainWindow.xib To create a flipside controller, choose the Utility Application template when you start RootViewController a new project. It creates a small hierarchy of objects, as shown in figure 7.8. MainViewController The flipside controller contains three MainView.xib FlipsideViewController view controllers and two views. Each of the FlipsideView.xib MainView view controllers is a subclass of UIViewFlipsideView Controller, whereas the views are each a Figure 7.8 Several objects are created in a subclass of UIView. The main view controller is called the flipside controller. RootViewController. It s loaded through MainWindow.xib. Much of the template s work is done, as you d expect, through its class files. The RootViewController.m file loads the MainViewController (using the initWithNibName: method to load its unique nib file) and then creates a special toggleView method for when the info button at the bottom of the page is pushed. When this happens, the FlipsideViewController also loads. Listing 7.4 shows this standard method, which you shouldn t have to modify.
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