iOS 7 - Getting warning message while presenting modal view controller

Question

Compiling and running using iOS 7 - I am getting warning message: "Presenting view controllers on detached view controllers is discouraged" while presenting modal view controller. I never had problem with iOS 6 or earlier version. Can anyone show if anything changed while presenting the modal view controller?

SearchViewController *controller1;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    controller1 = [[SearchViewController alloc] initWithNibName:@"SearchViewController-iPad" bundle:nil];
}
else
{
   controller1 = [[SearchViewController alloc] initWithNibName:@"SearchViewController" bundle:nil];
}
controller1.delegate = self;
[[self navigationController] presentModalViewController:controller1 animated:YES];

*EDIT * Here is the code Can someone point out where it is nested. Looks like they are nested, Please suggest how to link using child viewcontroller pattern.

(void)applicationDidFinishLaunching:(UIApplication *)application
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
        self.loginRootviewController =   [[MainViewController alloc] initWithNibName:@"MainViewController-iPad" bundle:nil];
    }
    else
    {
       self.loginRootviewController =   [[MainViewController alloc] initWithNibName:@"MainViewController" bundle:nil];
    }

    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:self.loginRootviewController];


    DDMenuController *rootController = [[DDMenuController alloc] initWithRootViewController:navController];
    _menuController = rootController;



    AppMainMenuViewController *leftController = [[AppMainMenuViewController alloc] init];
    rootController.leftViewController = leftController;
    self.loginRootviewController.delegateLogin = leftController;

    self.window.rootViewController = rootController;

    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];

}

Answer 1

A view controller is detached if the story board is not aware of any segues that connect that view controller in any way back to the root view controller.

It's suggested that you create a segue via Interface Builder and call it in code, even for a modal view, if you are using a storyboard.

Even with XCode 4.6.x and iOS 6.x, you got warnings at build time about unattached view controllers.

If you have two storyboards (one for iPhone and one for iPad), you can name the segue the same for each. Segue identifiers only have to be unique per storyboard. So, performing a segue (performSegueWithIdentifier) with the same identifier can take you to one place on the iPhone and another on the iPad.

Answer 2

I had the same problem, and me too I was NOT using storyboard (I am working on a three years old project).

In my case the cause was that I did not assign the rootViewController of my application to the window, like this:

- (BOOL)application:didFinishLaunchingWithOptions:
{
    ...
    self.window.rootViewController = myRootViewController; // I was missing this
    ...
}

No more warnings now.

Answer 3

This warning normally comes when we try to present a view controller modally in other view controller which is not part of rootViewController, and we just addSubview the view controller's view.

At this stage we should call presentViewController in that view controller which is part of rootViewController.

So we can directly present any view controller in rootViewController

UIViewController *vc = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
[vc presentViewController:obj animated:YES completion:nil];
[vc dismissViewControllerAnimated:YES completion:nil];

Answer 4

For those using DDMenuViewController, this is an easy fix. Just add [self addChildViewController:controller]; to initWithRootViewController, and to setRightViewController and setLeftViewController.