UINavigationController popViewController is popping everything!

Question

So I'm trying to pop a view controller off the stack when an error occurs, but it seems like it's popping too much off in one go. The navigation bar up the top loses its title and buttons, but the old table view data remains visible. I have no idea what's going on...

The basic set up is:

• Tab View template
  • Navigation controller
    • View controller (Loaded from the xib)
    • View controller (Pushed, what I want to pop)

Here's the code:

NSLog(@"%@", [[self navigationController] viewControllers]);
[[self navigationController] popViewControllerAnimated:NO];
NSLog(@"%@", [[self navigationController] viewControllers]);

The resulting NSLog's show:

2009-09-22 19:57:14.115 App[34707:550b] (
    <MyViewController: 0xd38a70>,
    <MyViewController: 0xd36b50>
)
2009-09-22 19:57:14.115 App[34707:550b] (null)

Anyone have experience with this?

Answer 1

I am seeing some odd UINavigationController stack behavior with just using

[self.navigationController popViewControllerAnimated:YES];

inside of a delegate called out of a tableView:didSelectRowAtIndexPath: call.

The views don't work right, and a UINavigationController provided "back" operation doesn't correctly pop the view of this delegate, going back another level.

I found that if I used

[self.navigationController popToViewController:self animated:YES];

instead, that suddenly everything worked fine. This is in an application with ARC turned on.
So, I can only guess that there is some reference housekeeping that doesn't happen correctly unless you tell it to pop back to a specific view controller when you will pop a view controller that will immediately become "unreferenced" by that pop.