Question

我正在尝试通过在ViewDidLoad中添加UINavigationController来将其添加到现有的视图控制器中：

- (void)viewDidLoad
{
    [super viewDidLoad];

    navController = [[UINavigationController alloc]init];

    [self.view addSubview:navController.view];
}

但通过这样做，它完全阻止了我的观点。它将UINavigationBar放在顶部，但视图的其余部分不响应输入。

这就是我呈现视图的方式。 SecondViewController 是我想拥有NavController的那个：

UITabBarController *tabController = [[UITabBarController alloc] init];

FirstViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"CardsViewController" bundle:nil];

UITabBarItem *tab1 = [[UITabBarItem alloc] initWithTitle:@"First" 
                                                   image:[UIImage imageNamed:@"img1.png"] tag:1];
[viewController1 setTabBarItem:tab1];    

SecondViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"ShoppingViewController" bundle:nil];

UINavigationController *SecondViewNavCont = [[UINavigationController alloc]initWithRootViewController:viewController2];

UITabBarItem *tab2 = [[UITabBarItem alloc] initWithTitle:@"Second" 
                                                   image:[UIImage imageNamed:@"img2.png"] tag:2];
[SecondViewNavCont setTabBarItem:tab2];

UIViewController *viewController3 = [[UIViewController alloc] init];
UITabBarItem *tab3 = [[UITabBarItem alloc] initWithTitle:@"Third" 
                                                   image:[UIImage imageNamed:@"img3.png"] tag:3];
[viewController3 setTabBarItem:tab3];


tabController.viewControllers = [NSArray arrayWithObjects:viewController1, 
                                 viewController2, 
                                 viewController3, 
                                 nil];

[self.view addSubview:tabController.view];

Answer 1

您无法将其添加到当前视图控制器你需要做的不是呈现ViewController而是将这个viewcontroller添加到导航视图控制器并呈现

UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:YourPresentedViewController];
//then present the navController
[self presentModalViewController:navController animated:YES];

现在，当您出示时，请执行以下操作

NSArray arrayWithObjects:viewController1, 
                                 SecondViewNavCont, 
                                 viewController3, 
                                 nil];

Answer 2

您可以尝试使用此代码将uiviewcontroller加载到uinavigationcontroller：

    yourviewController *viewcontroller=[[yourviewController alloc] initWithNibName:@"yourviewController" bundle:nil];
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewcontroller];
    [self presentModalViewController:navController animated:YES];

（或）你想在应用程序启动时加载uinavigationcontroller尝试下面的应用程序委托类代码：

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
   UINavigationController *navController = [[UINavigationController alloc]  initWithRootViewController:viewcontroller.view];
   [self.window addSubview:navController.view];
   [self.window makeKeyAndVisible];
   return YES;
}

欢迎！

Answer 3

您需要为navController对象设置RootViewController。然后你可以使用pushViewController方法推送UIViewcontroller对象。

Answer 4

您需要为该导航控制器添加视图。添加的导航控制器没有视图，因此它覆盖在UIViewController上你需要添加

 [[UINavigationController alloc] initWithNibName:@"ViewControllerName" bundle:nil];

将UINavigationController添加到现有UIViewController的正确方法

4 个答案: