Creating a view controller without a nib
Solution 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];
Solution 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
Ben Packard
iOS developer and program manager located in Washington, DC.
Updated on June 04, 2022Comments
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Ben Packard almost 2 years
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]; }