ios - 如何通过 Storyboard以编程方式设置首先加载哪个屏幕

Question

我正在开发一个具有登录屏幕的应用程序。它在用户默认值中记录用户是否登录。如果他没有登录，我想将用户引导到登录页面，否则导航到应用程序主屏幕。如何使用 Storyboard以编程方式执行此操作。

if(![[NSUserDefaults standardUserDefaults] boolForKey:@"loggedin"]) {

    //If logged in

} else {

   //if logged out

}

Answer 1

在您的 appdelegate 中编写此代码。并且不要忘记为您的 View Controller 提供标识符名称

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
        self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];

        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

        UIViewController *viewController = // determine the initial view controller here and instantiate it with [storyboard instantiateViewControllerWithIdentifier:<storyboard id>];

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

        return YES;
    }