Root view controller in a Storyboard

Question

I'm playing around with a single-window template. I have a classic MainStoryboard.storyboard file and I have only 1 view controller (which is an Initial View Controller all by default)

What I do is I try to implement the behaviour from this example and the Xcode tells me this:

Application windows are expected to have a root view controller at the end of application launch

I don't understand what I'm doing wrong. Here's the piece of code where I create a new UIWindow:

UIWindow *overlayWindow = [[UIWindow alloc] init];
    overlayWindow = [[ACStatusBarOverlayWindow alloc] initWithFrame:CGRectZero];
    overlayWindow.hidden = NO;

And of course my appDelegate starts with this:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    return YES;
}

What am I doing wrong?

Gabriele Petronella · Accepted Answer · 2012-12-26T12:08:49.477

2

You should make your window key and visible by

[overlayWindow makeKeyAndVisible];

as suggested in the very same example you linked.

EDIT

This the code you are using

UIWindow *overlayWindow = [[UIWindow alloc] init];
overlayWindow = [[ACStatusBarOverlayWindow alloc] initWithFrame:CGRectZero];
overlayWindow.hidden = NO;

The first line its useless and potentially it is the one which is causing the warning. You are creating a UIWindow instance and than throwing it away in the next line.

Remove it and just do:

UIWindow *overlayWindow = [[ACStatusBarOverlayWindow alloc] initWithFrame:CGRectZero];
overlayWindow.hidden = NO;

Also you should assign a root view controller to the newly created window, by

overlayWindow.rootViewController = self.window.rootViewController;

edited Dec 26 '12 at 12:08

answered Dec 25 '12 at 19:07

Gabriele Petronella

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Oh God, now it gives me an error "Property 'rootViewController' not found on object of type 'ViewController *'" and if I use `overlayWindow.rootViewController = self` it just doesn't work! – Sergey Grischyov Dec 26 '12 at 11:54
1

sorry I made a typo. I wanted to write `self.window.rootViewController` – Gabriele Petronella Dec 26 '12 at 12:10
question: where is the code for presenting the overlay window? So far you're just creating it. EDIT: stupid question, we are taking of UIWindow – Gabriele Petronella Dec 26 '12 at 12:12
What do you mean by *presenting*? Isn't makeKeyAndVisible is what does that for us? – Sergey Grischyov Dec 26 '12 at 12:13
Sorry I just realized the question was nonsense. Anyway have you tried my last update? – Gabriele Petronella Dec 26 '12 at 12:17
Yeah and it doesn't work either. Showing the warning and I never actually managed to get that view displayed. **Ever**. – Sergey Grischyov Dec 26 '12 at 12:18
Ok then, concerning the warning you simply have to create the window instance after the loading, for instance in the `viewDidAppear` method of your controller. Where are you doing that now? – Gabriele Petronella Dec 26 '12 at 12:42
You are, where is the code you posted for creating the `UIWindow` located? – Gabriele Petronella Dec 26 '12 at 12:47
Ah, it's in the viewDidLoad. Even if I put it to viewWillAppear **and** viewDidAppear it changes nothing. – Sergey Grischyov Dec 26 '12 at 12:49
If you put it in viewWillAppear it does show the warning, still I'm not able to make it visible. – Gabriele Petronella Dec 26 '12 at 13:05
Me too. When put in the viewDidAppear it shows no warning but the view is invisible. Something's wrong with that rootViewController value – Sergey Grischyov Dec 26 '12 at 13:07
Well, I did it partially. I had to create a new class and a new UIWindow which had to be (strong, nonatomic). You can take a look at where I am now - http://stackoverflow.com/questions/14051129/application-windows-are-expected-to-have-a-root-view-controller-conditional-ap – Sergey Grischyov Dec 27 '12 at 07:55

Root view controller in a Storyboard

1 Answers1