自定义标签栏控制器不工作？

Question

我想建立一个自定义标签栏控制器，但由于某些原因，视图不会切换...初始视图加载正常。这里是我的init方法：

- (id)initWithNibName:(NSString *)nibNameOrNil 
      bundle:(NSBundle *)nibBundleOrNil 
{ 
AccountViewController *accountViewController = [[AccountViewController alloc] 
        initWithNibName:@"AccountViewController" bundle:nil]; 
MoreViewController *moreViewController = [[MoreViewController alloc] 
        initWithNibName:@"MoreViewController" bundle:nil]; 
BarTabViewController *barTabViewController = [[BarTabViewController alloc] 
        initWithNibName:@"BarTabViewController" bundle:nil]; 
LocationsViewController *locationsViewController = [[LocationsViewController alloc] 
        initWithNibName:@"LocationsViewController" bundle:nil]; 

self.viewControllers = [NSArray arrayWithObjects:locationsViewController, accountViewController, 
         barTabViewController, moreViewController, nil]; 

[self.view addSubview:locationsViewController.view]; 
self.selectedController = locationsViewController; 

    return self; 
} 

就像我说的，这会正确显示所选择的控制器，但是当应用程序启动，我尝试切换视图与标签栏，子视图只是变成灰色......我一直在浏览几个教程来试图解决这个问题，但看起来我正在做的完全一样。我也检查了IB文件以确保我的标签连接正确，他们是。下面是切换项目代码：

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item 
{ 
    if (item == locationsTabBarItem) { 
     UIViewController *locationsController = [viewControllers objectAtIndex:0]; 
     [self.selectedController.view removeFromSuperview]; 
     [self.view addSubview:locationsController.view]; 
     self.selectedController = locationsController; 
    } 
    else if (item == accountsTabBarItem) { 
     UIViewController *accountsController = [viewControllers objectAtIndex:1]; 
     [self.selectedController.view removeFromSuperview]; 
     [self.view addSubview:accountsController.view]; 
     self.selectedController = accountsController; 
    } 
    else if (item == barTabTabBarItem) { 
     UIViewController *barTabController = [viewControllers objectAtIndex:2]; 
     [self.selectedController.view removeFromSuperview]; 
     [self.view addSubview:barTabController.view]; 
     self.selectedController = barTabController; 
    } 
    else { 
     UIViewController *moreController = [viewControllers objectAtIndex:3]; 
     [self.selectedController.view removeFromSuperview]; 
     [self.view addSubview:moreController.view]; 
     self.selectedController = moreController; 
    } 
} 

Answer 1

尝试用这一个

self.tabBarController = [[UITabBarController alloc] init]; 
    self.tabBarController.selectedIndex = 0; 

    self.tabBarController.viewControllers = [NSArray arrayWithObjects:locationsViewController, accountViewController, 
         barTabViewController, moreViewController, nil]; 
    self.tabBarController.modalTransitionStyle = UIModalTransitionStyleCoverVertical; 
    [self.navigationController pushViewController:delegate.tabBarController animated:YES];