Iphone 目标-C-导航栏标题

这是我的AppDelegate，我设置了一个标题Pizza，但是当我构建并播放应用程序时，文本不会出现

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.

UITabBarController *tabBarController = [[UITabBarController alloc]init];
ListaPizzeViewController *listPizzeVC = [[ListaPizzeViewController alloc]init];

UINavigationController *navigationControllerPizza = [[UINavigationController alloc]initWithRootViewController:listPizzeVC];
[navigationControllerPizza setTitle:@"Pizza"];
navigationControllerPizza.tabBarItem.image = [UIImage imageNamed:@"Default.png"];


  ListIngredientsViewController *listIngredientVC = [[ListIngredientsViewController alloc]init];
UINavigationController *navigationControllerIngradient = [[UINavigationController alloc]initWithRootViewController:listIngredientVC];
[navigationControllerIngradient setTitle:@"Ingredient"];
navigationControllerIngradient.tabBarItem.image = [UIImage imageNamed:@"Default.png"];

[tabBarController setViewControllers:@[navigationControllerPizza, navigationControllerIngradient]];

[self.window setRootViewController:tabBarController];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}

---

为什么？

根据您的问题，您可以使用ListaPizzeViewController的对象设置ListaPizzeViewController的标题，如下所示：-

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.

    UITabBarController *tabBarController = [[UITabBarController alloc]init];
    ListaPizzeViewController *listPizzeVC = [[ListaPizzeViewController alloc]init];

    UINavigationController *navigationControllerPizza = [[UINavigationController alloc]initWithRootViewController:listPizzeVC];

    [listPizzeVC setTitle:@"Pizza"]; // Here it is you can set Title of Object of Viewcontroller so set like thin not [navigationControllerPizza setTitle:@"Pizza"];

    navigationControllerPizza.tabBarItem.image = [UIImage imageNamed:@"Default.png"];


      ListIngredientsViewController *listIngredientVC = [[ListIngredientsViewController alloc]init];
    UINavigationController *navigationControllerIngradient = [[UINavigationController alloc]initWithRootViewController:listIngredientVC];
    [navigationControllerIngradient setTitle:@"Ingredient"];
    navigationControllerIngradient.tabBarItem.image = [UIImage imageNamed:@"Default.png"];

    [tabBarController setViewControllers:@[navigationControllerPizza, navigationControllerIngradient]];

    [self.window setRootViewController:tabBarController];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
    }

---

只需调用它。

进入您的ListaPizzeViewController，在viewDidLoad写入中

self.title = @"Pizze";

---

尝试在ViewWillAppeard方法中设置标题

listPizzeVC作为

---

它是title是ViewController属性，因此使用ViewController对象和title集编写代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:  (NSDictionary *)launchOptions
 {
     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.

     UITabBarController *tabBarController = [[UITabBarController alloc]init];
     ListaPizzeViewController *listPizzeVC = [[ListaPizzeViewController alloc]init];

     UINavigationController *navigationControllerPizza = [[UINavigationController  alloc]initWithRootViewController:listPizzeVC];
    //[navigationControllerPizza setTitle:@"Pizza"];
    listPizzeVC.title=@"Pizza";
    navigationControllerPizza.tabBarItem.image = [UIImage imageNamed:@"Default.png"];


    ListIngredientsViewController *listIngredientVC = [[ListIngredientsViewController alloc]init];
    UINavigationController *navigationControllerIngradient = [[UINavigationController alloc]initWithRootViewController:listIngredientVC];
   //[navigationControllerIngradient setTitle:@"Ingredient"];
    listIngredientVC.title=@"Ingredient";
   navigationControllerIngradient.tabBarItem.image = [UIImage imageNamed:@"Default.png"];

   [tabBarController setViewControllers:@[navigationControllerPizza, navigationControllerIngradient]];

  [self.window setRootViewController:tabBarController];
  self.window.backgroundColor = [UIColor whiteColor];
  [self.window makeKeyAndVisible];
  return YES;

}

---

我希望它也有用。

您的代码不应该在appDelegate中，而应该在从UIViewController继承的viewcontroller类中，并将该类附加到xib或故事板屏幕。每个屏幕一个viewcontroller。将代码添加到viewDidLoad或创建自己的方法。当这不起作用时，你可能想尝试再次发布你的问题

---

我最近开始了iOS开发，它帮助我采取了一些小步骤，创建了一个小项目，旨在一次学习一件事。这样，你就可以快速高效地学习，而不会有太多的挫折感。祝你好运

您是否尝试过[listPizzeVC setTitle:@Pizza]？但当你们在导航控制器中推另一个VC时，它就会改变。我根据问题给出了答案。他们可以把标题作为我的答案。这完全有效

self.title=@"Pizza";

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:  (NSDictionary *)launchOptions
 {
     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.

     UITabBarController *tabBarController = [[UITabBarController alloc]init];
     ListaPizzeViewController *listPizzeVC = [[ListaPizzeViewController alloc]init];

     UINavigationController *navigationControllerPizza = [[UINavigationController  alloc]initWithRootViewController:listPizzeVC];
    //[navigationControllerPizza setTitle:@"Pizza"];
    listPizzeVC.title=@"Pizza";
    navigationControllerPizza.tabBarItem.image = [UIImage imageNamed:@"Default.png"];


    ListIngredientsViewController *listIngredientVC = [[ListIngredientsViewController alloc]init];
    UINavigationController *navigationControllerIngradient = [[UINavigationController alloc]initWithRootViewController:listIngredientVC];
   //[navigationControllerIngradient setTitle:@"Ingredient"];
    listIngredientVC.title=@"Ingredient";
   navigationControllerIngradient.tabBarItem.image = [UIImage imageNamed:@"Default.png"];

   [tabBarController setViewControllers:@[navigationControllerPizza, navigationControllerIngradient]];

  [self.window setRootViewController:tabBarController];
  self.window.backgroundColor = [UIColor whiteColor];
  [self.window makeKeyAndVisible];
  return YES;