如何将按钮添加到 UINavigationController

Question

我有以下代码，将导航控制器添加到模态视图。导航栏和视图都显示正常，但右键没有。我做错了什么？

    UpgradesViewController* upgradesViewController = [[UpgradesViewController alloc] initWithNibName:@"UpgradesView" bundle:nil];
    upgradesViewController.title = @"Upgrades";

    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:upgradesViewController];
    navController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    navController.navigationBar.barStyle = UIBarStyleBlack;
    UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Show" style:UIBarButtonItemStylePlain target: self  action:nil];
    navController.navigationItem.rightBarButtonItem = doneButton;
    [self presentModalViewController:navController animated:YES];

    [navController release];
    [upgradesViewController release];

Answer 1

将 doneButton 添加到 upgradesViewController 的 navigationItem，而不是 navController。导航控制器显示顶部控制器的导航项，而不是其自身。