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];
});}

我在一个应用程序中也有类似的问题要解决，我使用了以下方法。我没有使用通知来处理导航。

我在应用程序中有三个故事板。

启动画面故事板-用于应用程序初始化和检查用户是否已经登录 登录故事板——用于处理用户登录流程 标签栏故事板-用于显示应用程序内容

我在应用程序中的初始故事板是启动画面故事板。 我有导航控制器作为根登录和选项卡栏故事板处理视图控制器导航。

我创建了一个Navigator类来处理应用程序导航，它看起来像这样:

class Navigator: NSObject {

   static func moveTo(_ destinationViewController: UIViewController, from sourceViewController: UIViewController, transitionStyle: UIModalTransitionStyle? = .crossDissolve, completion: (() -> ())? = nil) {
       

       DispatchQueue.main.async {

           if var topController = UIApplication.shared.keyWindow?.rootViewController {

               while let presentedViewController = topController.presentedViewController {

                   topController = presentedViewController

               }

               
               destinationViewController.modalTransitionStyle = (transitionStyle ?? nil)!

               sourceViewController.present(destinationViewController, animated: true, completion: completion)

           }

       }

   }

}

让我们来看看可能的场景:

首次应用发行; 启动屏幕将加载，我检查用户是否已经登录。然后登录屏幕将使用Navigator类加载，如下所示;

因为我有导航控制器作为根，我实例化导航控制器作为初始视图控制器。

let loginSB = UIStoryboard(name: "splash", bundle: nil)

let loginNav = loginSB.instantiateInitialViewcontroller() as! UINavigationController

Navigator.moveTo(loginNav, from: self)

这将从应用程序窗口的根目录中删除slpash故事板，并将其替换为登录故事板。

在登录故事板中，当用户成功登录时，我将用户数据保存到user Defaults中，并初始化UserData单例来访问用户详细信息。然后使用navigator方法加载标签栏故事板。

Let tabBarSB = UIStoryboard(name: "tabBar", bundle: nil)
let tabBarNav = tabBarSB.instantiateInitialViewcontroller() as! UINavigationController

Navigator.moveTo(tabBarNav, from: self)

现在用户从标签栏的设置屏幕中退出。我清除所有保存的用户数据，并导航到登录屏幕。

let loginSB = UIStoryboard(name: "splash", bundle: nil)

let loginNav = loginSB.instantiateInitialViewcontroller() as! UINavigationController

Navigator.moveTo(loginNav, from: self)

用户登录并强制杀死应用程序

当用户启动应用程序时，启动画面将被加载。我检查用户是否已登录，并从用户默认中访问用户数据。然后初始化UserData单例，显示标签栏而不是登录屏幕。

我用这个来检查第一次发射:

- (NSInteger) checkForFirstLaunch
{
    NSInteger result = 0; //no first launch

    // Get current version ("Bundle Version") from the default Info.plist file
    NSString *currentVersion = (NSString*)[[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"];
    NSArray *prevStartupVersions = [[NSUserDefaults standardUserDefaults] arrayForKey:@"prevStartupVersions"];
    if (prevStartupVersions == nil)
    {
        // Starting up for first time with NO pre-existing installs (e.g., fresh
        // install of some version)
        [[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObject:currentVersion] forKey:@"prevStartupVersions"];
        result = 1; //first launch of the app
    } else {
        if (![prevStartupVersions containsObject:currentVersion])
        {
            // Starting up for first time with this version of the app. This
            // means a different version of the app was alread installed once
            // and started.
            NSMutableArray *updatedPrevStartVersions = [NSMutableArray arrayWithArray:prevStartupVersions];
            [updatedPrevStartVersions addObject:currentVersion];
            [[NSUserDefaults standardUserDefaults] setObject:updatedPrevStartVersions forKey:@"prevStartupVersions"];
            result = 2; //first launch of this version of the app
        }
    }

    // Save changes to disk
    [[NSUserDefaults standardUserDefaults] synchronize];

    return result;
}

(如果用户删除应用程序并重新安装，则算作第一次启动)

在AppDelegate中，我检查了第一次启动，并创建了一个带有登录屏幕(登录和注册)的导航控制器，我把它放在当前主窗口的顶部:

[self.window makeKeyAndVisible];

if (firstLaunch == 1) {
    UINavigationController *_login = [[UINavigationController alloc] initWithRootViewController:loginController];
    [self.window.rootViewController presentViewController:_login animated:NO completion:nil];
}

因为它在常规视图控制器的顶部它独立于应用的其他部分如果你不再需要它，你可以解散视图控制器。如果用户手动按下按钮，您也可以以这种方式显示视图。

顺便说一句:我保存用户的登录数据是这样的:

KeychainItemWrapper *keychainItem = [[KeychainItemWrapper alloc] initWithIdentifier:@"com.youridentifier" accessGroup:nil];
[keychainItem setObject:password forKey:(__bridge id)(kSecValueData)];
[keychainItem setObject:email forKey:(__bridge id)(kSecAttrAccount)];

对于注销:我从CoreData(太慢)切换到现在使用nsarray和nsdictionary来管理我的数据。注销仅仅意味着清空这些数组和字典。另外，我确保在viewWillAppear中设置我的数据。

就是这样。

以下是我的霉霉解决方案，以飨未来的围观群众。

1)创建一个协议来处理登录和注销功能:

protocol LoginFlowHandler {
    func handleLogin(withWindow window: UIWindow?)
    func handleLogout(withWindow window: UIWindow?)
}

2)扩展上述协议，并提供此处注销的功能:

extension LoginFlowHandler {

    func handleLogin(withWindow window: UIWindow?) {

        if let _ = AppState.shared.currentUserId {
            //User has logged in before, cache and continue
            self.showMainApp(withWindow: window)
        } else {
            //No user information, show login flow
            self.showLogin(withWindow: window)
        }
    }

    func handleLogout(withWindow window: UIWindow?) {

        AppState.shared.signOut()

        showLogin(withWindow: window)
    }

    func showLogin(withWindow window: UIWindow?) {
        window?.subviews.forEach { $0.removeFromSuperview() }
        window?.rootViewController = nil
        window?.rootViewController = R.storyboard.login.instantiateInitialViewController()
        window?.makeKeyAndVisible()
    }

    func showMainApp(withWindow window: UIWindow?) {
        window?.rootViewController = nil
        window?.rootViewController = R.storyboard.mainTabBar.instantiateInitialViewController()
        window?.makeKeyAndVisible()
    }

}

3)然后我可以使我的AppDelegate符合LoginFlowHandler协议，并在启动时调用handleLogin:

class AppDelegate: UIResponder, UIApplicationDelegate, LoginFlowHandler {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        window = UIWindow.init(frame: UIScreen.main.bounds)

        initialiseServices()

        handleLogin(withWindow: window)

        return true
    }

}

从这里，我的协议扩展将处理逻辑或确定用户是否登录/退出，然后相应地更改windows rootViewController !

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];
});}

我和你的情况一样，我找到的清理数据的解决方案是删除所有的CoreData东西，我的视图控制器依赖于绘制它的信息。但是我仍然发现这种方法是非常糟糕的，我认为一个更优雅的方法可以做到这一点，没有故事板，只使用代码来管理视图控制器之间的转换。

我在Github上找到了这个项目，它只通过代码来做所有这些事情，而且很容易理解。他们使用一个类似facebook的侧菜单，他们所做的是根据用户是否登录而改变中心视图控制器。当用户注销时，appDelegate将从CoreData中删除数据，并将主视图控制器再次设置为登录屏幕。