更改故事板后，不会调用Tabbar委托方法

Question

我在主故事板中没有的登录故事板中有登录和注册 viewcontrollers。

一旦注册或登录成功，我就会将Login storyboard更改为Main。以下代码有效但当我选择任何选项卡时，它不会在 AppDelegate

中调用tab delegate方法

但是，如果用户已成功注册或登录，则会调用以下tabbar委托方法。

LoginViewController.m

if(isLoginSuccess)
{
    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    CustomTabBarViewController *tbc = [mainStoryboard instantiateViewControllerWithIdentifier:@"tabbar"];
    tbc.selectedIndex = 2;
    [self presentViewController:tbc animated:YES completion:nil];
}

AppDeletage.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    CustomTabBarViewController *tabBarController = (CustomTabBarViewController *)self.window.rootViewController;
    tabBarController.delegate = self;
    return YES;
}

-(void) tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    if (tabBarController.selectedIndex == 2) {
        if(![self isRegistered])
        {
            UIStoryboard *loginStoryboard = [UIStoryboard storyboardWithName:@"LoginStoryboard" bundle:nil];
            UIViewController *vc = [loginStoryboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
            [ROOTVIEW presentViewController:vc animated:YES completion:nil];
        }
        else
        {
            tabBarController.selectedIndex = 2;
        }
    }
}

更新：

AppDelegate没有被调用，但我想知道为什么以下代码在用户注销后没有在AppDelegate中打开Loginstoryboard。

#define ROOTVIEW [[[UIApplication sharedApplication] keyWindow] rootViewController]


UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"LoginStoryboard" bundle:nil];
UIViewController *vc = [mainStoryboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
[ROOTVIEW presentViewController:vc animated:YES completion:nil];

Answer 1

请查看以下代码。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    UIStoryboard *main = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UITabBarController *tabController = [main instantiateViewControllerWithIdentifier:@"TabbarController"];
    tabController.delegate = self;
    return YES;
}

-(void) tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{
    NSLog(@"Selected Index - %lu",(unsigned long)tabBarController.selectedIndex);
}

在ViewController的按钮上单击方法，

- (IBAction)btnLoginTapped:(id)sender {
    UIStoryboard *main = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UITabBarController *tabController = [main instantiateViewControllerWithIdentifier:@"TabbarController"];
    tabController.selectedIndex = 1;
    [self presentViewController:tabController animated:YES completion:nil];
}

然后在 Main.storyboard 上，从对象库拖动对象，并将其放在第一响应者下面标签栏控制器场景，将对象类设置为AppDelegate ，然后右键单击标签栏控制器并将委托设置为该对象类，如下图所示。

让我知道它是否有效，我已准备好帮助解决方案。