ios - 如何在使用标签视图控制器的页面中将标题设置为第一个导航控制器。？

Question

我们在应用委托中使用了以下代码。但是我们在导航控制器的 setTitle 函数中遇到了错误。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
    UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
    UIViewController* viewController3=[[ThirdViewController alloc]initWithNibName:@"ThirdViewController" bundle:nil];
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2,viewController3, nil];
    NavigationViewController* navigationViewController=[[NavigationViewController alloc]initWithRootViewController:self.tabBarController];
  self.navigationItem.title=@"news";
    self.window.rootViewController = navigationViewController;
    [self.window makeKeyAndVisible];

    return YES;
}

Answer 1

self.navigationItem.title=@"your navigation title";

在您要显示标题的视图控制器中使用它

Answer 2

[viewController1 setTitle:@"Title1"];
[viewController2 setTitle:@"Title2"];
[viewController3 setTitle:@"Title3"];

带有标题的既不是导航控制器也不是标签栏控制器。