ios - 如何从第二个 View Controller 添加标签栏 Controller

Question

<分区>

Answer 1

最好的方法是当应用程序从标签栏 Controller 第一个屏幕启动时以模态方式显示登录屏幕，在 viewWillAppear 中添加用于显示登录屏幕的代码，并在登录后关闭屏幕。您可以像这样在 appDelegate 中创建 TabBarController

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{


    UITabBarController tabBarController=[[UITabBarController alloc] init]; 


    FirstViewController *firstVC =  [[UIViewController alloc] initWithNibName:@"FirstVC" bundle:nil];
    UINavigationController *firstNavController = [[UINavigationController alloc] initWithRootViewController: firstVC];     

    SecondViewController *secondVC = [[UIViewController alloc] initWithNibName:@"secondVC" bundle:nil];
    UINavigationController *secondNavController = [[UINavigationController alloc] initWithRootViewController:secondVC]; 

   tabBarController.viewControllers = [NSArray arrayWithObjects: firstNavController, secondNavController, nil];

    tabBarController.selectedIndex=0;
    tabBarController.delegate = self;

UITabBarItem *item1 = [[UITabBarItem alloc] initWithTitle:@"Movies" image:[UIImage imageNamed:@"MoviesTAB.png"] tag:1];

    [firstVC  setTabBarItem:item1];

    UITabBarItem *item2 = [[UITabBarItem alloc] initWithTitle:@"Music" image:[UIImage imageNamed:@"musicTAB.png"] tag:2];
    [seconfVC setTabBarItem:item2];

    tabController.tabBar.translucent  = NO;
    tabController.tabBar.barStyle = UIBarStyleBlack;
    tabBarController.tintColor = [UIColor whiteColor];

    self.window.rootViewController = tabController;
return YES;
}