UINavigationBar refuses to show in Modal View Controller

I am loading a Modal view controller using the following code in my RootViewController:

[self.navigationController presentModalViewController:accountViewController animated:YES];

In the accountViewController xib file, I have set a navigation bar. My MainWindow.xib and RootViewController.xib also have the navigation bar setup correctly. Additionally, my app delegate has setup the navigation controller (I assume) correctly:

UINavigationController *aNavigationController = [[UINavigationController alloc] initWithRoo开发者_Python百科tViewController:rootViewController];
self.navigationController = aNavigationController;

[window addSubview:navigationController.view];

However, when I load my accountViewController the UINavigationBar is nowhere to be seen. Is it not possible to show a UINavigationBar in a modal view? I was planning to use it to hide the back button, and add a right button...

sha's answer is correct, but I'm giving my own answer to expand on it with a code example to make it clear.

You probably want something like:

- (void)showAccountViewController
{
    AccountViewController* accountViewController = [[AccountViewController alloc] initWithNibName:@"AccountView" bundle:nil];
    ...
    // Initialize properties of accountViewController
    ...
    UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:accountViewController];
    [self.navigationController presentModalViewController:navController animated:YES];
    [navController release];
    [accountViewController release];
}

You need to push not viewController but navigationController that has viewController inside.

You can also set the presentation style in the Attribute Inspector to "Current Context". Modal View will not cover the Navigational Bar.