听起来像self。tabBarController返回nil。tabBarController可能没有在接口生成器中连接起来。在Interface Builder中将tabBarController的IBOutlet设置为tabBarController。

没有一个答案能完全解决我的问题。

我正在开发一个升级到ARC的旧iOS4项目，现在正在为iOS 7开发Xcode 5

我通读了所有这些文件，并开始检查我的配置和代码。

为我修复它的是添加

-(BOOL) application:(UIApplication*) application didFinishLaunchingWithOptions: (NSDictionary*) launchOptions
{
    // Maybe do something
    return YES;
}

除了有

- (void)applicationDidFinishLaunching:(UIApplication *)application
{
}

我没有

-(BOOL) application:(UIApplication*) application didFinishLaunchingWithOptions: (NSDictionary*) launchOptions

在得到错误之前。

我遇到了同样的问题，但我使用的是故事板

将我的故事板InitialViewController分配给我窗口的rootViewController。

In

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
...
UIStoryboard *stb = [UIStoryboard storyboardWithName:@"myStoryboard" bundle:nil];
self.window.rootViewController = [stb instantiateInitialViewController];
return YES;
}

这就解决了问题。

尝试将选项卡栏控制器的IBOutlet连接到接口生成器中的根视图，而不是

self.window.rootViewController = self.tabBarController;

但实际上我还没见过这样的错误。

OrdoDei给出了一个正确而有价值的答案。我添加这个答案只是为了给出一个didFinishLaunchingWithOptions方法的例子，该方法使用了他的答案以及其他关于导航控制器的评论。

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

    // Override point for customization after application launch.

    // Instantiate the main menu view controller (UITableView with menu items).
    // Pass that view controller to the nav controller as the root of the nav stack.
    // This nav stack drives our *entire* app.
    UIViewController *viewController = [[XMMainMenuTableViewController alloc] init];
    self.navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];

    // Instantiate the app's window. Then get the nav controller's view into that window, and onto the screen.
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // [self.window addSubview:self.navigationController.view];
    // The disabled line above was replaced by line below. Fixed Apple's complaint in log: Application windows are expected to have a root view controller at the end of application launch
    [self.window setRootViewController:self.navigationController];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

我收到了同样的错误信息，因为我调用了警报

- (void)applicationDidBecomeActive:(UIApplication *)application 

而不是

- (void)applicationWillEnterForeground:(UIApplication *)application