报错Application windows are expected to have a root view controller at the end of application launc

控制台执行出现如下报错

Application windows are expected to have a root view controller at the end of application launch

解决办法

在AppDelegate.m中的

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

中输入

 XXXController *controller = [[XXXViewController alloc]init];

 [self.window setRootViewController:controller];

即可