Question

I’ve created a very simple app with a UINavigationController as the root controller but when I run it only half (the left hand side) of the navigation bar is displayed. Why is this? It seems strange – if I’ve done something wrong you’d think it wouldn’t display at all, but instead its exactly half!

The controller looks like this:

@interface RootController : UINavigationController { 
    UIWebView*  webView;
    NSMutableString       *htmlString;
}

With corresponding @property declarations and @synthesize.

I’m not using any .nibs for the view controller/view. The app delegate is:

- (BOOL)application:(UIApplication *)application  didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    RootController* theRVC = [[RootController alloc] init];
    self.window.rootViewController = theRVC;
    [theRVC release];
    [self.window makeKeyAndVisible];
    return YES;
}

And the controller has the following relevant code:

- (void)loadView
{
    webView = [[UIWebView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
    self.view = webView;
    [webView release];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
}

Answer 1

You shouldn’t derive from UINavigationController.

Instead, derive your RootController class from UIViewController.
Then, in the application delegate you init a UINavigationController passing in the RootController, and set it as the windows rootViewController.

- (BOOL)application:(UIApplication *)application  didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    RootController* theRVC = [[RootController alloc] init];
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:theRVC];
    self.window.rootViewController = navController;
    [theRVC release];
    [navController release];
    [self.window makeKeyAndVisible];
    return YES;
}