UINavigationController releasing bonanza

Question

At the end of this code:

UIViewController *viewController = [[UIViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
[viewController release];
[self presentModalViewController:navigationController animated:YES];
[navigationController release];

The navigation controller appear modally, as usual, but when I click a button on the viewController, it crashes. In fact, the viewController has a retain count of 0. If I comment one of the two releases everything went better than expected. I have been seeing this code pretty much everywhere, what could be wrong?

Answer 1

The code you've posted is correct, but somewhere else you're over releasing something.

A few things to note:

First, never trust retainCount.

Second, make sure you're properly managing the memory of your nib objects as outlined here.

Finally, you'll need to use the NSZombie detection in Instruments to find out where your real problem lies. This video provides a nice how to.