Ios 不同的UIViewController已登录

当用户打开应用程序时，它会显示login

UIViewController

。当用户登录时，重定向到下一个mapkit

UIViewController

。但当用户再次打开应用程序时，我希望他跳过登录

UIViewController

。我该怎么做？我尝试在登录方法

viewwillbeen

中以编程方式重定向，但效果不好（第二次显示控制器）

---

您可以这样做：

AppDelegate.m

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

    // replace with your real auth-checking
    if ([self wasAuthorized] == NO) {

        [self showLoginController];

    }

    return YES;

}

- (UIViewController *)mainController {

    UINavigationController *rootNavigationController = (UINavigationController *)[[self window] rootViewController];
    return [[rootNavigationController viewControllers] firstObject];

}

- (void)showLoginController {

    UIViewController *loginController = [self loginController];
    dispatch_async(dispatch_get_main_queue(), ^{

        [self.mainController presentViewController:loginController animated:YES completion:nil];        

    });

}

- (UIViewController *)loginController {

    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    return [mainStoryboard instantiateViewControllerWithIdentifier:@"LoginNavController"];

}

---

更好的方法是在AppDelegate中添加此检查

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    if(isLoggedin) {
        Storyboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
        UIViewController *mapViewController = [storyboard instantiateViewControllerWithIdentifier:@"mapViewController" ];
        self.rootViewController = [[UINavigationCotroller alloc] initWithRootViewController:mapViewController];
    }
    return YES;
}

---

不要在第一个视图控制器的

视图中将显示：

方法中检查登录，而是在应用程序代理的

didfishlaunchingwithoptions:

方法中执行此操作：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    if (loggedIn) {
        UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
        [navigationController.topViewController performSegueWithIdentifier:@"1to2" sender:navigationController.topViewController];
        return YES;
    }
}

其中

1to2

是从视图控制器1到2的段的标识符