viewController初始类集

Question

我有两个视图控制器，默认ViewController以及我稍后为登录添加的视图：LoginViewController。我将LoginViewController设置为初始视图。但是，当我在LoginViewController中的viewDidLoad之后运行应用时，它也会在-viewDidLoad中触发ViewController。 我有一个模态segue，登录成功后执行segue并显示ViewController，这是有效的。但是在执行app ViewController时也会被解雇。有谁知道为什么会这样？的AppDelegate：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions 
    { 
    // Override point for customization after application launch. 
    UIStoryboard *storyboard = self.window.rootViewController.storyboard;
    UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"LoginView"]; 
    self.window.rootViewController = rootViewController; 
    [self.window makeKeyAndVisible]; 
    return YES; 
}