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Drawing QR-Code in Objective-C Creating basic view controllers

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The table view controller
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Like the plain view controller, the table view controller manages a single page. Unlike the plain view controller, it does so in a structured manner. It automatically organizes the data in a nicely formatted table. Our discussion of the table view controller will be similar to the discussion we just completed of the bare view controller. We ll examine its place in the view hierarchy, and then you ll learn how to create it, modify it, and use it at runtime. Let s get started by examining the new view controller s anatomy.
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The anatomy of a table view controller
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The table view controller s setup is slightly more comUITableViewController plex than that of the bare view controller. A UITableViewController controls a UITableView, which is an object that contains some number of UITableView UITableViewCell objects arranged in a single column. This is shown in figure 5.4. UITableViewCell By default, the controller is both the delegate and UITableViewCell the data source of the UITableView. As we ve previUITableViewCell ously discussed, these properties help a view hand off events and actions to its controller. The responsibili- Figure 5.4 A table view ties for each of these control types is defined by a spe- controller controls a table view cific protocol: UITableViewDelegate declares which and its collection of cells. messages the table view controller must respond to, and UITableViewDataSource details how it must provide the table view with content. You can look up these protocols in the same library that you ve been using for class references. Of all the view controllers, the table view controller is the trickiest to create on its own, for reasons that you ll see momentarily.
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The easiest way to create an application that uses a table view controller is to use the Navigation-Based template in Xcode. This provides you with a delegate and a view that contains a table view controller. It also creates some of the delegate methods required for interfacing with the table view. Although you can quickly start an application using the Navigation-Based template, we ll discuss in detail how you can manually build a table view controller project. This will give you a better understanding of what s going on when you use the template. Table 5.6 shows the process. The project-creation, object-creation, and object-linking steps pretty much follow the lessons you ve already learned. You have to create the subclass for the table view controller because the class file is where you define what the table view contains; we ll cover this in more depth shortly.
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Table 5.6 Creating a table view controller is simple, but it involves several steps. Step 1. Create a new project. Description Open a Window-Based Application, and select iPhone from the Product drop-down menu. In Xcode, create a new file containing a subclass of UIViewController. Then, select UITableViewController from the options. In Xcode, create an IBOutlet for your interface in the app delegate header file. In Interface Builder, link an outlet from your table view controller to the IBOutlet in the app delegate object, using the Connections tab of the inspector window. Link the controller s view to your main window.
2. Create a table view controller.
3. Link your Interface Builder object.
4. Connect your controller.
Note that you use two of the more advanced Interface Builder techniques that you learned in chapter 4: first linking in a new class (by changing the Identity tab) and then creating a new connection from it to your app delegate (via the Connections tab). As a result, you end up with two connections from Interface Builder to Xcode. On the one hand, the Interface Builder-created table view controller depends on your RootViewController files for its own methods; on the other hand, your app delegate file links to the controller (and eventually to the methods) via its outlet. This two-part connection to Interface Builder is common, and you should make sure you understand it before moving on. As usual, you could elect to create this object solely in Xcode, by using an allocinit command:
UITableViewController *myTable = [[RootViewController alloc] initWithStyle:UITableViewStylePlain];
The following simple code finishes the table-creation process by linking in the table s view in step 4 of the process:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ [window addSubview:myTable.view]; [window makeKeyAndVisible]; }
Note that you link up your table view controller s view not the controller itself to your window. You ve seen in the past that view controllers come with automatically created views. Here, the view is a table view. If you want to see how that table view works, you can now go back into Interface Builder and click the table view to get its details. As shown in
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