To further illustrate what i mean, this is how the itemsViewController is set as the rootViewController in the Chapter 10 code examples for the method application:didFindishLaunching WithOptions:
[code] - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
// Override point for customization after application launch.
//create an items view controller itemsViewController = [[ItemsViewController alloc] init];
//Place items view controller’s tabel view in the window hierarchy
[window setRootViewController: itemsViewController];
[self.window makeKeyAndVisible]; return YES;
However, for this to work now, window needs to be replaced with _window.
Just a snippet shown here:
//Place items view controller's tabel view in the window hierarchy
[_window setRootViewController: itemsViewController];
Hope this helps and saves people a bit of time.