顶级栏不会出现在presentModalViewController中

Question

我创建了一个名为addItemToListViewController的UIViewController子类.我选择了添加"xib",只是创建了一个带有几个标签和textField的简单页面.在界面构建器中,我选择了"顶栏 - 导航栏",以便在应用程序运行时将其放入堆栈时,它将具有与初始主窗口匹配的顶栏.在"界面"构建器中,它显示顶部边框,但是当我在模拟器中运行应用程序时,一旦显示视图,顶部栏就不存在了.

这是我放在rootViewController中以呈现视图控制器的代码

- (IBAction)addButtonPressed:(id)sender 
{   
    AddItemToListViewController *addItemToListViewController = [[AddItemToListViewController alloc] initWithNibName: @"AddItemToListViewController" bundle:nil];

    [self presentModalViewController: AddItemToListViewController animated: YES];
    [AddItemToListViewController release];
}

如果我手动将导航栏添加到xib,我只能让顶部栏出现.如果我必须向我的xib添加导航栏,"Top Bar"属性的目的是什么？

Answer 1

- (IBAction)addButtonPressed:(id)sender 
{   
    AddItemToListViewController *addItemToListViewController = [[AddItemToListViewController alloc] initWithNibName: @"AddItemToListViewController" bundle:nil];
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:addItemToListViewController];
    [self presentModalViewController: navController animated: YES];
    [AddItemToListViewController release];
    [navController release];
}