Present a navigation view from view controller - IOS 7

Question

I got an error when I need to present a navigation controller from view controller like below:

"Warning: Attempt to present on whose view is not in the window hierarchy!"

The code as below:

UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"NavMain" bundle:nil];
UINavigationController * mainViewController = [storyboard instantiateInitialViewController];
mainViewController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentViewController:mainViewController animated:YES completion:NO];

How to fix the bugs or does I had any error when implement storyboard? I use two storyboard from main.storyboard to NavMain.storyboard

Answer 1

The error means that self 's view hasn't loaded yet. You want to call this code after the view has loaded. So put it in:

    -(void)viewDidAppear:(BOOL)animated;