ios - AppDelegate 抛出 NSInternalInconsistencyException

Question

我正在尝试从我的 AppDelegate 打开 Storyboard，但它抛出了异常:

2016-10-25 10:26:16.776 momnt[22865:1300106] *** Terminating app due to  
 uncaught exception 'NSInternalInconsistencyException', 
 reason: 'Application windows are expected to have a root view 
 controller at the end of application launch'

这是我正在尝试做的:

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

    UIStoryboard *loginStoryboard = [UIStoryboard storyboardWithName:@"Login" bundle:nil];
    UIViewController *mainViewController = [loginStoryboard instantiateInitialViewController];

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.rootViewController = mainViewController;
    [self.window makeKeyAndVisible];

    return YES;
}

我读到较新版本的 XCode 要求所有 Windows 都必须有一个 rootViewController，但我已经做到了。

Answer 1

调试应用程序并检查 mainViewController 是否不是 nil。

问题似乎是您没有在 Storyboard中将任何 viewController 设置为初始 viewcontroller。

将您想要的任何 View Controller 设置为初始 View Controller ，您的代码可以正常工作。

或者

使用instantiateViewControllerWithIdentifier并将您想要作为初始viewController的viewController标识符传递给它。

UIStoryboard *storybord = [UIStoryboard storyboardWithName:@"Login" bundle:nil];

UIViewController *mainViewController = [storybord instantiateViewControllerWithIdentifier:@"InitialViewControllerID"];

self.window.rootViewController = mainViewController;
[self.window makeKeyAndVisible];