ios - 如何根据条件设置初始 View Controller ？

Question

根据条件用户是否登录到服务器显示不同的模板。如果用户未登录到应用程序服务器，则需要显示 LoginViewController[UIViewController]，否则显示 TabBarViewcontroller[UITabBarViewController]。

因为我是第一次使用 Storyboard。谁能建议我在 Storyboard 中处理这种情况？

Answer 1

我是这样做的。

首先，您创建一个名为 LoginViewController 的东西。它实现了您的登录逻辑。您的根 Controller 是 UITabBarController。

现在在 AppDelegate 中:

- (void) doLogin:(NSDictionary *)dict
{
        TransactionsViewController *transactions;
        BalancesViewController *balances;
        ProfileViewController *profile;
        UINavigationController *navi;
        UITabBarController *root;

        root = (UITabBarController *)self.window.rootViewController;

        navi = [root.viewControllers objectAtIndex:0];
        transactions = [navi.viewControllers objectAtIndex:0];
        transactions.delegate = self;

        navi = [root.viewControllers objectAtIndex:1];
        balances = [navi.viewControllers objectAtIndex:0];
        balances.delegate = self;

        navi = [root.viewControllers objectAtIndex:2];
        profile = [navi.viewControllers objectAtIndex:0];
        profile.delegate = self;

        [transactions loadDataFromLogin:dict];
        [balances loadDataFromLogin:dict];
        [profile loadDataFromLogin:dict];
}

- (void) showLoginView
{
        assert(loginController == nil);
        assert(activityView == nil);

        UITabBarController *tabbar = (UITabBarController *)self.window.rootViewController;
        loginController = [tabbar.storyboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
        loginController.delegate = self;
        [tabbar presentModalViewController:loginController animated:YES];
}

- (void) loginWithLogin:(NSDictionary *)dict relogin:(BOOL)relogin
{
        NSString *_login = [dict valueForKey:@"email"];
        NSString *_pass = [dict valueForKey:@"pass"];
        NetworkOperation *op = [NetworkOperation operationLogin:_login pass:_pass];
        [NetworkOperation enqueueOperation:op observer:self];
        if (!relogin && !loginController)
                [self doLogin:dict];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
        session = nil;
        loginController = nil;

        return YES;
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
        NSString *login = [[NSUserDefaults standardUserDefaults] stringForKey:@"email"];
        NSString *pass = [[NSUserDefaults standardUserDefaults] stringForKey:@"pass"];
        NSString *name = [[NSUserDefaults standardUserDefaults] stringForKey:@"name"];
        if ((login == nil || login.length == 0) ||
            (pass == nil || pass.length == 0) ||
            (name == nil || name.length == 0)) {
                if (!loginController) {
                        [self.window makeKeyAndVisible];
                        [self performSelector:@selector(showLoginView) withObject:nil afterDelay:0.1];
                }
        } else {
                NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:login, @"email",
                                      pass, @"pass", name, @"name", nil];
                [self loginWithLogin:dict relogin:(session != nil)];
        }
}

因此，您的应用代理会检查您是否存储了您的通行证和登录信息。如果是，那么它使用它们登录并切换到您的 Root View Controller 。在我的例子中，它是一个选项卡，以显示带有余额、交易等的几个选项卡。

如果没有登录和通过，则在 Root View Controller 的顶部显示登录 View Controller 。

@session 是您当前的 session 。正如您在代码中看到的那样，登录正在使用排队操作。

如果您需要更多详细信息，请联系我。