How to get visible viewController from app delegate when using storyboard?

Question

I have some viewControllers, and I don\'t use NavigationController. How can I get visible view controller in app delegate methods (e.g. appli

Answer 1

This is an improved version of @ProgrammierTier's answer. If you have a navbar nested in a tabbar, you will get back UINavigationController using @ProgrammierTier's answer. Also, there is less force unwrapping. This should address the issue @Harendra-Tiwari is facing.

Swift 4.2:

func getVisibleViewController(_ rootViewController: UIViewController?) -> UIViewController? {

  var rootVC = rootViewController
  if rootVC == nil {
      rootVC = UIApplication.shared.keyWindow?.rootViewController
  }

  var presented = rootVC?.presentedViewController
  if rootVC?.presentedViewController == nil {
      if let isTab = rootVC?.isKind(of: UITabBarController.self), let isNav = rootVC?.isKind(of: UINavigationController.self) {
          if !isTab && !isNav {
              return rootVC
          }
          presented = rootVC
      } else {
          return rootVC
      }
  }

  if let presented = presented {
    if presented.isKind(of: UINavigationController.self) {
        if let navigationController = presented as? UINavigationController {
            return navigationController.viewControllers.last!
        }
     }

     if presented.isKind(of: UITabBarController.self) {
        if let tabBarController = presented as? UITabBarController {
            if let navigationController = tabBarController.selectedViewController! as? UINavigationController {
                 return navigationController.viewControllers.last!
             } else {
                 return tabBarController.selectedViewController!
             }
         }
     }

     return getVisibleViewController(presented)
  }
  return nil
}

Answer 2

modified from troop231

+ (UIViewController *)visibleViewController:(UIViewController *)rootViewController
{
    if ([rootViewController isKindOfClass:[UINavigationController class]])
    {
        UINavigationController *navigationController = (UINavigationController *)rootViewController;
        UIViewController *lastViewController = [[navigationController viewControllers] lastObject];

        return [self visibleViewController:lastViewController];
    }
    if ([rootViewController isKindOfClass:[UITabBarController class]])
    {
        UITabBarController *tabBarController = (UITabBarController *)rootViewController;
        UIViewController *selectedViewController = tabBarController.selectedViewController;

        return [self visibleViewController:selectedViewController];
    }

    if (rootViewController.presentedViewController != nil)
    {
        UIViewController *presentedViewController = (UIViewController *)rootViewController.presentedViewController;
        return [self visibleViewController:presentedViewController];
    }

    return rootViewController;
}