Ios 如何从appdelegate显示UIViewConcoller

我正在使用UIAbbarOnToller（带有5个UIViewController）和uinavigation bar开发一个应用程序。 我已经在应用程序中创建了所有这些，但当我运行它时，它不起作用

这是AppDelegate.m类：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    UINavigationController *navCon = [[UINavigationController alloc] init];
    UITabBarController *tabBarController = [[UITabBarController alloc] init];
    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];

    HomePageView *viewController = [[HomePageView alloc] init];
    FeedViewController *feedViewController=[[FeedViewController alloc]init];
    ProfileViewController *profileViewController=[[ProfileViewController alloc]init];
    PlayViewController *playViewController = [[PlayViewController alloc]init];
    ListeningSessionViewController *listeningSessionViewController= [[ListeningSessionViewController alloc]init];
    RecievedViewController *recievedViewController =[[RecievedViewController alloc]init];

    tabBarController.viewControllers=[NSArray arrayWithObjects:feedViewController,profileViewController,playViewController,listeningSessionViewController,recievedViewController, nil];

    //navigating to the UITabBarController that you created
    [navCon pushViewController:tabBarController animated:YES];
    [navCon pushViewController:viewController animated:NO];

    return YES;
}

在.h

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UINavigationController *navC;
@property (strong, nonatomic) UITabBarController *tabC;

在.m中的

appdidfish

// Initialize window
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];

// Initialize your five tab controllers.  with each tab has its own navigation controller
FeedViewController *feedViewController=[[FeedViewController alloc]init];
UINavigationController *nav1 = [[UINavigationController alloc]initWithRootViewController:feedViewController];

ProfileViewController *profileViewController=[[ProfileViewController alloc]init];
UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:profileViewController];

PlayViewController *playViewController = [[PlayViewController alloc]init];
UINavigationController *nav3 = [[UINavigationController alloc]initWithRootViewController:playViewController];

ListeningSessionViewController *listeningSessionViewController= [[ListeningSessionViewController alloc]init];
UINavigationController *nav4 = [[UINavigationController alloc]initWithRootViewController:listeningSessionViewController];

RecievedViewController *recievedViewController =[[RecievedViewController alloc]init];
UINavigationController *nav5 = [[UINavigationController alloc]initWithRootViewController:recievedViewController];

// initialize tabbarcontroller and set your viewcontrollers.
self.tabC = [[UITabBarController alloc]init];
self.tabC.viewControllers=[NSArray arrayWithObjects:nav1,nav2,nav3,nav4,nav5, nil];

// Inititalize Navigationcontroller and set root as tabbar.
self.navC = [[UINavigationController alloc]initWithRootViewController:self.tabC];

// Set Window rootview as navigation.
self.window.rootViewController = self.navC;

// Show window
[self.window makeKeyAndVisible];

---

这可能会对您有所帮助。

在

Main.storyBoard

中实例化一个

UITabBarController

，并将其连接到identity inspector中的类

tabBarCon

接口：

@interface tabBarCon: UITabBarController

@end

实施：

@implementation tabBarCon

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization

    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

   // Do any additional setup after loading the view.

   HomePageView *viewController = [[HomePageView alloc] init];
   FeedViewController *feedViewController=[[FeedViewController alloc]init];
   ProfileViewController *profileViewController=[[ProfileViewController alloc]init];
   PlayViewController *playViewController = [[PlayViewController alloc]init];
   ListeningSessionViewController *listeningSessionViewController= [[ListeningSessionViewController alloc]init];
   RecievedViewController *recievedViewController =[[RecievedViewController alloc]init];


        NSArray *viewControllerArray = [[NSArray alloc]initWithObjects:viewController,
                                                                       feedViewController,
                                                                       profileViewController,
                                                                       playViewController,
                                                                       listeningSessionViewController,
                                                                        recievedViewController,nil];

//Then add buttons
 UITabBarItem *moreItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemMore tag:0];
 viewController.tabBarItem = moreItem;
//...


 self.viewControllers = viewControllerArray;


}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

---

为什么要将选项卡栏控制器推到导航控制器上？根据需要，每个选项卡都应该有自己的导航控制器。@rmaddy我删除了该行，但它仍然不工作。“不工作”是开发人员可以使用的最无用的词。这是毫无意义的。请更新您的问题，详细说明您希望发生的事情，并解释实际发生的事情。具体点。我看不到你在任何地方将tabBarController添加到窗口。尝试用

self.window.rootViewController=tabBarController

替换

return YES

之前的最后两行，我是否可以让tabbar项目同时显示？因为在我设置了所有项目之后，当我运行时，只会显示第一个项目标题。因此，如果要显示其他Tabbaritem，我必须单击每个选项卡才能看到下面的标题。那么，列出所有Tabbaritem的应用程序呢？你不必单击每个选项卡，然后它会在下面显示标题，它在应用程序首次加载时已经存在。你明白我的意思吗？