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POhow to decide rootView in AppDelegate
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copied!<p>I am learning iOS and developing my first iPone app. I want to add a feature to my app: if a user has login before, I want to redirect the user to the main view. otherwise, I want to redirect the user to the login view.</p> <p>I have read <a href="https://stackoverflow.com/questions/10610012/ios-change-storyboard-default-view-controller-at-run-time">ios change storyboard default view controller at run time</a>, but I am wondering whether I can write the code that decides the root view in AppDelegate. Therefore, I won't have a view that is never launched. </p> <p>this is my code in AppDelegate:</p> <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; [[UIApplication sharedApplication] registerForRemoteNotificationTypes: (UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)]; MainViewController *rootVC = [[MainViewController alloc] init]; if (userNeverLogin) { LoginViewController *rootVC = [[LoginViewController alloc] init]; } self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:rootVC]; return YES; } </code></pre> <p>this code doesn't work (it will not trigger any error, but it will show nothing in the simulator). how should I revise it? Or it's impossible to do this feature in AppDelegate?</p> <p>I am sorry that I am a newbie to iOS. I hope this question is not stupid.</p>

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