Set a custom subclass of UINavigationBar in UINavigationController programmatically

Question

Does anyone know how can I use my custom subclass of UINavigationBar if I instantiate UINavigationController programmatically (without IB)?

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Answer 1

Update: Using object_SetClass() no longer works as if iOS5 GM. An alternate solution has been added below.

Use NSKeyedUnarchiver to manually set the unarchive class for the nav bar.

   MyViewController *controller = [[[MyViewController alloc] init] autorelease];
   NSKeyedUnarchiver *unarchiver = [[[NSKeyedUnarchiver alloc] initForReadingWithData:[NSKeyedArchiver archivedDataWithRootObject:controller]] autorelease];
   [unarchiver setClass:[MyNavigationBar class] forClassName:@"UINavigationBar"];
   controller = [unarchiver decodeObjectForKey:@"root"];

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Note: This original solution only works pre-iOS5:

There is a great solution, which I posted here -- inject navBar subclass directly into your view the UINavigationController:

#import 

- (void)viewDidLoad {
    [super viewDidLoad];

    object_setClass(self.navigationController.navigationBar, [MyNavBar class]);
    // the rest of your viewDidLoad code
}