Ipad 如何在popover控制器中设置标题为的导航栏

如何在popover控制器中设置带有标题的导航栏？我想要一个详细的解释，请帮助我。 提前谢谢

SomeViewController *popContentViewController = [[SomeViewController alloc] initWithNibName:@"SomeViewController" bundle:nil];
UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:popContentViewController];
UIPopoverController popOverController = [[UIPopoverController alloc] initWithContentViewController:controller]; 
popOverController.delegate = self;
[popContentViewController release];
[controller release];

并在viewDidLoad方法的SomeViewController类中写入

self.title = @"Text For Title on Navigation Bar";

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