ios - UINavigationController Presenting Modal View Controller Displays Grey Screen While Loading -

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The following code sets my UIWindow and UINavigationController, from which I want to present the model view controllers: 

  self.window = [[UIWindow alloc] initWithFrame: [[UIScreen main screen] border]]; ViewController * Controller = [[ViewController alloc] initWithNibName: @ "ViewController" bundle: zero]; Self.navController = [[UINavigationController alloc] initWithRootViewController: Controller]; Self.window.rootViewController = self.navController; [Self. Windows Sethead: Fails];

Once I set it, I display a controller that is provided by a third party library: 

  [Self.navigationController presentViewController: self.presentedViewController animated: not complete: zero];

Modal View Controller is loading, while a gray screen is showing, wondering how I can hide it during model controller load.


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