A Completed Game: Belt Commander - Beginning iOS6 Games Development - page 270

Figure 12-8. Overview of iPhone XIB file
In Figure 12-8 , we see the XIB file for the iPhone version of this game fully expanded. On the left, at
item A, we see a reference to the main UIWindow of the game, as well as a reference to the AppDelegate .
The view controller at item B is an instance of the class RootViewController , which is a subclass of
UINavigationController . The view controller RootViewController is wired up to the Window so that it is
the root controller; this causes the RootViewController's top-level UIViewController to be displayed.
In short, everything is wired up so the view at item E is displayed at launch.
In Figure 12-8 , we see that there are two other UIViewControllers: Extras Controller at item C
and Belt Commander Controller at item D. The object Extras Controller corresponds to the view at
item G, while the object BeltCommanderController corresponds to the view at item G. Both of these
controllers have an IBOutlet in our class RootViewController so they can be referenced. In fact, many
of the objects in the XIB file are connected to the RootViewController , as shown in Listing 12-1.
Listing 12-1. RootViewController.m
@interface RootViewController : UINavigationController<BeltCommanderDelegate,
UIAlertViewDelegate, GKLeaderboardViewControllerDelegate>{
IBOutlet UIViewController* welcomeController;
IBOutlet BeltCommanderController* beltCommanderController;