Question

I am working on my first iPhone app and making good progress. But there is one thing I just don’t understand.

When my app starts it displays a UIView with some functionality on it. This works fine. One of the buttons on that screen is supposed to load a new view (HistoryViewController) which contains a navigation controller.

The problem is… whenever HistoryViewController is loaded the app crashes because there is no view. It’s true because in the xib-File I can’t connect the File’s Owner’s view to anything:
http://www.freeimagehosting.net/image.php?1a3caa8b8d.png

I definitely have a lack of knowledge somewhere but after hours of research I have not been able to solve this problem.

Any hints?
Thank you!

Answer 1

It’s hard to tell what your problem is exactly, but I’ll offer some advice.

When creating a navigation controller (or tab controller for that matter) in interface builder, its easy to not understand what is really happening, so my suggestion drop interface builder for a second and lets build it in code.

In general I really dislike building either UI Navigation Controller or tab view controller in interface builder, I really just rather build the views themselves and create the UINavigationController in code.

You have a view which shows the HistoryTableViewController which you want to be contained in a UINavigationController so the code to do this is:

- (void) showHistory 
{
      HistoryViewController *historyVC = [[HistoryViewController alloc] init];
      // If you create historyviewcontroller in nib
      // HistoryViewController *histroyVC [[HistoryViewController alloc] initWithNibName:@"myNib" bundle:nil];

      UINavigationController *navController = [[UINavigationController alloc] initWithRootController:histroyViewController];
      [self presentModalViewContoller:navController animated:YES];
}

This will create a nav controller showing your history view controller as the root view controller. Can’t be easier.