IPhone SDK: runtime crash pushing viewController onto navigationController

Question

Hi,
I have looked at this for hours but am completely stuck, any help would be much appreciated.
I have the following code which pushes a viewController onto a navigationController:
Scr1ViewController *scr1ViewController = [[[[Scr1ViewController alloc]]
initWithNibName:@"Scr1ViewController" bundle:nil] autorelease];
[self.navigationController pushViewController:scr1ViewController
animated:YES];
When nibNameOrNil is set to 'nil' the program runs fine and loads a blank view, so I'm guessing that the code is ok. But then when I set nibNameOrNil to the nib name the program crashes at runtime. This leads me to think that it must be a problem with my nib file.
The debugger log shows '-[UIViewController loadView] loaded the "Scr1ViewController" nib but no view was set.'
However, when creating the nib I have followed these steps in the Interface Builder Guide exactly, paying attention to every detail and checking repeatedly.
1. Create a new nib file using the Cocoa Touch View template.
2. Add a view controller object to the top level of the nib file.
3. Set the class of the view controller to your custom class.
4. Drag a navigation item from the library and drop it onto the view controller object.
5. In the Interface Builder document window, drag the view that came with the template and drop it on the view controller to associate it with the controller.
6. Double-click the view controller object to open its editor window.
7. Set the title of the navigation item to the default title for this navigation level.
8. Open the view and add any additional subviews to it to define your user interface (no additional subviews).
9. Save the nib file.
Are there any steps that the guide has missed out, I just can't seem to get it to work, I have created the nib from scratch again and again.
Thanks in advance.

Answer 1

Hi,
when creating a nib-file for the viewcontroller you do not need to add a viewcontroller to the top level. You create the viewController-object in your code so why creating another one in the nib-file?
Set the class of the file's owner to your viewcontroller-subclass.
Add a view to the toplevel and connect the file's ower view outlet to the view.
Add a navigationItem to the topLevel and connect that too.