UINavigationController标题和按钮未显示在UITabBarController中

Question

Im having difficulty getting the titles of the navigation bars to display along with the buttons within my tabBarController interface. Im creating the tabBarController programmatically. Here is the screenshot for reference.

I have tried putting self.navigationController.navigationBarHidden = YES; within the alloc/init method of the tabBarController which is allocated in the appDelegate and set as the windows rootViewController. I've also tried to set its title with this code self.navigationController.title = [[self.viewControllers objectAtIndex:self.selectedIndex]title ]; . I have also tried using the same code within the viewDidLoad method of my tabBarController class. Within the UITabBarController's alloc/init method I do have this code to set the nav controllers that I have added to the viewControllers array.

UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:contactsTblView];
        nav2.title = @"Contacts";
        nav2.navigationItem.title = @"Contacts";
        nav2.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemContacts tag:2];
        nav2.delegate = self ;

Answer 1

The title that appears in the navigation bar is the title of the currently showing view controller (the top of the navigation controller's stack). You should set the title of the individual view controllers embedded in the navigation controller, not the navigation controller itself.