UITableViewController 中的导航项没有出现？

Question

我正在以模态方式呈现的 UITabBarController 内部显示一个 UITableViewController：

-(IBAction)arButtonClicked:(id)sender{

   //this is a uitableviewcontroller
    ARViewController* arViewController = [[[ARViewController alloc] initWithNibName:@"ARViewController" bundle:nil]autorelease];

    LeaderBoardTableViewController* lbViewController = [[[LeaderBoardTableViewController alloc] initWithNibName:@"LeaderBoardTableViewController" bundle:nil]autorelease];
    lbViewController.title = @"Leaderboard";

    arTabBarController = [[UITabBarController alloc] initWithNibName:nil bundle:nil];
    arTabBarController.viewControllers = [NSArray arrayWithObjects:arViewController, lbViewController, nil];
    arTabBarController.selectedViewController = arViewController;

    [self presentModalViewController:arTabBarController animated:YES];
}

在我的 arViewController 方法的 viewDidLoad 中，我正在设置导航项：

- (void)viewDidLoad {
    [super viewDidLoad];

    // Uncomment the following line to preserve selection between presentations.
    self.clearsSelectionOnViewWillAppear = NO;
    self.title = @"AR";

    leaderBoardButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemOrganize 
                                                                  target:self 
                                                                  action:@selector(leaderBoardButtonClicked:)];

    self.navigationItem.rightBarButtonItem = leaderBoardButton;

}

当我的导航栏位于 UITabBarController 内部时，它不会出现，但当我推送视图本身时，它不会出现我能看到它。

我缺少什么？

Answer 1

呵呵，我也被这个问题难住了。您需要做的就是发送 rootViewController。

除了在主屏幕上之外，我从未使用过 tabBar，但你的代码可能如下所示：

after arTabBarController.selectedViewController = arViewController;

UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController: arTabBarController] autorelease];
[self presentModalViewController: navController animated:YES];

就像我说的，我还没有用 tabBar 做过，但我很确定它会是这样的

Answer 2

我需要添加一个 UINavigationBar：

ARViewController* arViewController = [[[ARViewController alloc] initWithNibName:@"ARViewController" bundle:nil]autorelease];
    UINavigationController *arNavController = [[UINavigationController alloc] initWithRootViewController:arViewController];

    LeaderBoardTableViewController* lbViewController = [[[LeaderBoardTableViewController alloc] initWithNibName:@"LeaderBoardTableViewController" bundle:nil]autorelease];
    lbViewController.title = @"Leaderboard";    
    UINavigationController *lbNavController = [[UINavigationController alloc] initWithRootViewController:lbViewController];

    arTabBarController = [[UITabBarController alloc] init];//initWithNibName:nil bundle:nil];
    arTabBarController.viewControllers = [NSArray arrayWithObjects:arNavController, lbNavController, nil];
    arTabBarController.selectedViewController = arNavController;

    [self presentModalViewController:arTabBarController animated:YES];

Answer 3

有一个简单的解决方案，将设置放在视图中就会出现，

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [self.navigationController setNavigationBarHidden:NO animated:animated];
}

希望对新手有帮助；