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Creating basic view controllers
Table 5.1 There are a variety of view controllers, giving you considerable control over how navigation occurs in your program. (continued) Object UINavigationBar Type View Summary A view that works with UINavigationController to create the navigation UI. A special template that supports a two-sided UIViewController. Modal view controllers that allow interaction with sophisticated user interfaces for the Address Book and the photos roll.
Flipside controller
View controller View controller
ABPeoplePickerNavigationController ABNewPersonViewController ABPersonViewController ABUnknownPersonViewController UIImagePickerController
As we ve already noted, we ll be discussing these view controllers in two different chapters. Here, we ll look at the single-page view controllers: UIViewController and UITableViewController. In chapter 7, we ll examine the multipage view controllers: UITabBarController, UINavigationController, and the flipside controller. This is a clear functional split: the single-page controllers exist primarily to support the controller role of the MVC model, whereas the multipage controllers exist primarily to support navigation and may even delegate MVC work to a simpler view controller lying below them. (As for the modal controllers, we ll get to them when we cover the appropriate topics in chapters 8 and 11.) So far, you ve been programming without using view controllers, which are an important part of SDK programming. You could write an SDK program without them, but every SDK program should include them, even if you use a bare-bones view controller to manage the rotation of the screen.
The standard view controller
The plain view controller is simple to embed inside your program. By why would you want to use a view controller That s going to be one of the topics we ll cover here. Now, we ll look at how view controllers fit into the view hierarchy, how you create them, how you expand them, and how you make active use of them. Let s get started with the most basic anatomical look at the view controller.
The anatomy of a view controller
A view controller is a UIViewController object that sits immediately above a view (of any sort). It, in turn, sits below some other object as part of the tree that ultimately goes back to an application s main window. This is shown in figure 5.1. When we move on to advanced view controllers in chapter 7, you ll see that the use of a bare
Window or superview
UIViewController
View
Figure 5.1 A bare view controller shows view controlling at its simplest: it sits below one object and above another.
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The standard view controller
view controller can grow more complex. Bare view controllers often sit beneath advanced view controllers, to take care of the individual pages that advanced view controllers let you navigate among. Looking at the iPhone OS s class hierarchy, you can see that the UIViewController is a direct descendent of NSObject. That means it doesn t get any of the functionality of UIResponder or UIView, which you find in most other UIKit objects. It s also the parent object of all the other view controllers we ll discuss. Practically, this means that the lessons learned here also apply to all the other controllers. But learning about how a view controller works leaves out one vital component: how do you create it
Creating a view controller
The easiest way to incorporate a plain view controller into your project is to select a different template when you create it. The View-Based Application template should probably be your default template for programming from here on out, because it comes with a view controller built in. As usual, the template s work is primarily done through Interface Builder. When you create a new project (which we ve called viewex for the purpose of this example), you can verify this by looking up the view controller s IBOutlet command in the program s app delegate header file:
ViewexViewController *viewController;
The app delegate s source code file further shows that the view controller s view has already been hooked up to the main window:
[window addSubview:viewController.view];
This view is a standard UIView that s created as part of the template. Although a view controller has only one view, that view may have a variety of subviews, spreading out into a hierarchy. We ll show you how to add a single object beneath the view in a moment, and you ll make more complete use of it in the next chapter. But before we get there, we want to step back and look at how you can create a view controller by hand if you need to.
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