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我想在我的应用程序中设置一个标签栏，在我的 appDelegate 中我这样做：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    UIViewController *viewController1 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease];
    UIViewController *viewController2 = [[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil] autorelease];
    [viewController2 viewDidLoad];
    UIViewController *viewController3 = [[[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil] autorelease];
    [viewController3 viewDidLoad];
    UIViewController *viewController4 = [[[FourthViewController alloc] initWithNibName:@"FourthViewController" bundle:nil] autorelease];
    [viewController4 viewDidLoad];
    self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = @[viewController1, viewController2, viewController3, viewController4];

    self.viewController = [[[HomeViewController alloc] initWithNibName:@"HomeViewController" bundle:nil] autorelease];

    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

您可以看到我不想立即使用标签栏启动我的应用程序，实际上我使用 HomeViewController 启动我的应用程序

在我的 HomeViewController 中，我打开 viewController1：

FirstViewController *first = [[FirstViewController alloc]initWithNibName:@"FirstViewController" bundle:nil];
    [self presentViewController:first animated:YES completion:nil];
    [first release];

但在我的 firstviewcontroller 中，我没有看到我的标签栏，为什么？（我声明如果我在没有 homeviewcontroller 的情况下开始，该应用程序可以在 tabbar 上正常工作）

4

1 回答 1

1

您看不到标签栏，因为在 HomeViewController 中您创建了 FirstViewController 的新实例并以模态方式呈现它。您应该在 HomeViewController 中创建并呈现整个 UITabBarController：

应用委托：

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

    self.viewController = [[[HomeViewController alloc] initWithNibName:@"HomeViewController" bundle:nil] autorelease];

    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

在 HomeViewController 内部：

FirstViewController *viewController1 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease];
SecondViewController *viewController2 = [[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil] autorelease];
ThirdViewController *viewController3 = [[[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil] autorelease];
FourthViewController *viewController4 = [[[FourthViewController alloc] initWithNibName:@"FourthViewController" bundle:nil] autorelease];

self.tabBarController = [[[UITabBarController alloc] init] autorelease];
self.tabBarController.viewControllers = @[viewController1, viewController2, viewController3, viewController4];

[self presentViewController:self.tabBarController animated:YES completion:nil];
于 2013-07-02T10:32:25.683 回答