Creating a view controller without a nib - ios

Question

In AppDelegate, I want to create a UIViewController subclass and add it's view. The viw itself will be specified in code - there is no nib.
Based on the apple docs, I should use
initWithNibName:nil bundle:nil];
and then in loadView of the controller, I add my subviews etc.
However, the follwing test code below does not work for me. I modelled the AppDelegate code on Apple's PageControl demo, simply because my app will implement a similar structure (specifically a base controller to manage a paged scroll view, and an array of other controller's to build the pages).
But I suspect my AppDelegate code is the problem, since logging proves that initWithNibName:: and loadView both fire. The app as below runs, but the screen is blank. I am expecting a green view with a label.
AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
ScrollerController *controller = [[ScrollerController alloc] initWithNibName:nil bundle:nil];
[self.window addSubview:controller.view];
[self.window makeKeyAndVisible];
return YES;
}
ScrollerController (the UIViewController subclass)
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)loadView{
CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];
UIView *contentView = [[UIView alloc] initWithFrame:applicationFrame];
contentView.backgroundColor = [UIColor greenColor];
self.view = contentView;
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(40, 40, 100, 40)];
[label setText:#"Label created in ScrollerController.loadView"];
[self.view addSubview:label];
}

Answer 1

Try to use:
self.window.rootViewController = controller;
instead of
[self.window addSubview:controller.view];
Note, that you should also #synthesize window; and create it
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

Answer 2

Instead of initWithNibNamed:, just use alloc and init or any of the other designated initalizers for the view controller. Here is an example from a project
hoverViewController=[[BDHoverViewController alloc] initWithHoverStatusStyle:BDHoverViewStatusActivityProgressStyle];
self.window.rootViewController=hoverViewController;
[self.window makeKeyAndVisible];
also, the correct form( for now anyways) for adding the root view controller to the window in the app delegate is like this:
self.window.rootViewcontroller=controller;
[self.window makeKeyAndVisible];
You don't need to add the view to the window. The above code does it automatically.
Good luck,
T