Adding back button to navigation bar

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If you’re using a navigation controller:

MyViewController *_myViewController = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];
[[self navigationController] pushViewController:_myViewController animated:YES];
UIBarButtonItem *_backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:nil action:nil];
self.navigationItem.backBarButtonItem = _backButton;
[_backButton release], _backButton = nil;
[_myViewController release], _myViewController = nil;

If you’re not using a navigation controller, look into the Three20 style components to make custom bar buttons.

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