在Xcode 7中，你可以有多个故事板。如果您能将Login流保存在一个单独的故事板中会更好。

这可以使用SELECT VIEWCONTROLLER > Editor > Refactor to Storyboard完成

这里是设置一个视图为rootviewcontroller -的Swift版本

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    appDelegate.window!.rootViewController = newRootViewController

    let rootViewController: UIViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("LoginViewController")

我不喜欢bhavya的答案，因为在视图控制器内使用AppDelegate和设置rootViewController没有动画。Trevor的回答是关于iOS8上闪烁视图控制器的问题。

UPD 07/18/2015

视图控制器内部的AppDelegate:

在视图控制器内更改AppDelegate状态(属性)会破坏封装。

每个iOS项目中非常简单的对象层次结构:

AppDelegate(拥有窗口和rootViewController)

ViewController(拥有视图)

顶部的对象可以改变底部的对象，因为它们正在创建这些对象。但是如果底部的对象改变它们上面的对象是不行的(我描述了一些基本的编程/OOP原则:DIP(依赖倒置原则:高级模块不能依赖于低级模块，但它们应该依赖于抽象))。

如果任何对象将改变这个层次结构中的任何对象，那么代码中迟早会出现混乱。在小项目上可能没问题，但在小项目上挖掘这个混乱是没有乐趣的=]

UPD 07/18/2015

我复制模态控制器动画使用UINavigationController (tl;dr:检查项目)。

我使用UINavigationController在我的应用程序中呈现所有控制器。最初，我在导航堆栈中显示登录视图控制器与普通的推送/弹出动画。然后我决定用最小的变化把它改成模态。

工作原理:

Initial view controller (or self.window.rootViewController) is UINavigationController with ProgressViewController as a rootViewController. I'm showing ProgressViewController because DataModel can take some time to initialize because it inits core data stack like in this article (I really like this approach). AppDelegate is responsible for getting login status updates. DataModel handles user login/logout and AppDelegate is observing it's userLoggedIn property via KVO. Arguably not the best method to do this but it works for me. (Why KVO is bad, you can check in this or this article (Why Not Use Notifications? part). ModalDismissAnimator and ModalPresentAnimator are used to customize default push animation.

动画师的逻辑工作原理:

AppDelegate sets itself as a delegate of self.window.rootViewController (which is UINavigationController). AppDelegate returns one of animators in -[AppDelegate navigationController:animationControllerForOperation:fromViewController:toViewController:] if necessary. Animators implement -transitionDuration: and -animateTransition: methods. -[ModalPresentAnimator animateTransition:]: - (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext { UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; [[transitionContext containerView] addSubview:toViewController.view]; CGRect frame = toViewController.view.frame; CGRect toFrame = frame; frame.origin.y = CGRectGetHeight(frame); toViewController.view.frame = frame; [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^ { toViewController.view.frame = toFrame; } completion:^(BOOL finished) { [transitionContext completeTransition:![transitionContext transitionWasCancelled]]; }]; }

测试项目在这里。

在你的appDelegate中。我在你的didFinishLaunchingWithOptions里面

//authenticatedUser: check from NSUserDefaults User credential if its present then set your navigation flow accordingly

if (authenticatedUser) 
{
    self.window.rootViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateInitialViewController];        
}
else
{
    UIViewController* rootController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"LoginViewController"];
    UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:rootController];

    self.window.rootViewController = navigation;
}

在SignUpViewController。m文件

- (IBAction)actionSignup:(id)sender
{
    AppDelegate *appDelegateTemp = [[UIApplication sharedApplication]delegate];

    appDelegateTemp.window.rootViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateInitialViewController];
}

在MyTabThreeViewController.m文件中

- (IBAction)actionLogout:(id)sender {

    // Delete User credential from NSUserDefaults and other data related to user

    AppDelegate *appDelegateTemp = [[UIApplication sharedApplication]delegate];

    UIViewController* rootController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"LoginViewController"];

    UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:rootController];
    appDelegateTemp.window.rootViewController = navigation;

}

Swift 4版本

didFinishLaunchingWithOptions在app delegate中假设你的初始视图控制器是TabbarController中的signed。

if Auth.auth().currentUser == nil {
        let rootController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "WelcomeNavigation")
        self.window?.rootViewController = rootController
    }

    return true

在注册视图控制器中:

@IBAction func actionSignup(_ sender: Any) {
let appDelegateTemp = UIApplication.shared.delegate as? AppDelegate
appDelegateTemp?.window?.rootViewController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateInitialViewController()
}

MyTabThreeViewController

 //Remove user credentials
guard let appDel = UIApplication.shared.delegate as? AppDelegate else { return }
        let rootController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "WelcomeNavigation")
        appDel.window?.rootViewController = rootController

在这里输入图像描述

在App Delegate.m

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
                                                     forBarMetrics:UIBarMetricsDefault];

NSString *identifier;
BOOL isSaved = [[NSUserDefaults standardUserDefaults] boolForKey:@"loginSaved"];
if (isSaved)
{
    //identifier=@"homeViewControllerId";
    UIWindow* mainWindow=[[[UIApplication sharedApplication] delegate] window];
    UITabBarController *tabBarVC =
    [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"TabBarVC"];
    mainWindow.rootViewController=tabBarVC;
}
else
{


    identifier=@"loginViewControllerId";
    UIStoryboard *    storyboardobj=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *screen = [storyboardobj instantiateViewControllerWithIdentifier:identifier];

    UINavigationController *navigationController=[[UINavigationController alloc] initWithRootViewController:screen];

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

}

return YES;

}

视图controller.m 视图中didload

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.

UIBarButtonItem* barButton = [[UIBarButtonItem alloc] initWithTitle:@"Logout" style:UIBarButtonItemStyleDone target:self action:@selector(logoutButtonClicked:)];
[self.navigationItem setLeftBarButtonItem:barButton];

}

在登出按钮动作

-(void)logoutButtonClicked:(id)sender{

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Alert" message:@"Do you want to logout?" preferredStyle:UIAlertControllerStyleAlert];

    [alertController addAction:[UIAlertAction actionWithTitle:@"Logout" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
           NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setBool:NO forKey:@"loginSaved"];
           [[NSUserDefaults standardUserDefaults] synchronize];
      AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
    UIStoryboard *    storyboardobj=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *screen = [storyboardobj instantiateViewControllerWithIdentifier:@"loginViewControllerId"];
    [appDelegate.window setRootViewController:screen];
}]];


[alertController addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
    [self dismissViewControllerAnimated:YES completion:nil];
}]];

dispatch_async(dispatch_get_main_queue(), ^ {
    [self presentViewController:alertController animated:YES completion:nil];
});}

在Xcode 7中，你可以有多个故事板。如果您能将Login流保存在一个单独的故事板中会更好。

这可以使用SELECT VIEWCONTROLLER > Editor > Refactor to Storyboard完成

这里是设置一个视图为rootviewcontroller -的Swift版本

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    appDelegate.window!.rootViewController = newRootViewController

    let rootViewController: UIViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("LoginViewController")

下面是我最终完成所有事情的方法。除此之外，你需要考虑的唯一一件事是(a)登录过程和(b)存储应用数据的位置(在本例中，我使用了单例)。

如你所见，根视图控制器是我的主选项卡控制器。我这样做是因为用户登录后，我希望应用程序直接启动到第一个选项卡。(这避免了登录视图临时显示的任何“闪烁”。)

AppDelegate.m

在这个文件中，我检查用户是否已经登录。如果不是，我就推登录视图控制器。我还处理注销过程，清除数据并显示登录视图。

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

    // Show login view if not logged in already
    if(![AppData isLoggedIn]) {
        [self showLoginScreen:NO];
    }

    return YES;
}

-(void) showLoginScreen:(BOOL)animated
{

    // Get login screen from storyboard and present it
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    LoginViewController *viewController = (LoginViewController *)[storyboard instantiateViewControllerWithIdentifier:@"loginScreen"];
    [self.window makeKeyAndVisible];
    [self.window.rootViewController presentViewController:viewController
                                             animated:animated
                                           completion:nil];
}

-(void) logout
{
    // Remove data from singleton (where all my app data is stored)
    [AppData clearData];

   // Reset view controller (this will quickly clear all the views)
   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
   MainTabControllerViewController *viewController = (MainTabControllerViewController *)[storyboard instantiateViewControllerWithIdentifier:@"mainView"];
   [self.window setRootViewController:viewController];

   // Show login screen
   [self showLoginScreen:NO];

}

LoginViewController。m

在这里，如果登录成功，我只需取消视图并发送通知。

-(void) loginWasSuccessful
{

     // Send notification
     [[NSNotificationCenter defaultCenter] postNotificationName:@"loginSuccessful" object:self];

     // Dismiss login screen
     [self dismissViewControllerAnimated:YES completion:nil];

}