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

Here is an answer in Swift 4 that is very similar to the accepted answer but has a few improvements:

1. Iterative instead of recursive.
2. Goes all the way does the navigation stack.
3. More "swifty" syntax.
4. Static variable that can be put anywhere (not just in AppDelegate).

5. Won't crash in odd cases, i.e. when a tab bar controller has no selected view controller.

   static var visibleViewController: UIViewController? {
       var currentVc = UIApplication.shared.keyWindow?.rootViewController
       while let presentedVc = currentVc?.presentedViewController {
           if let navVc = (presentedVc as? UINavigationController)?.viewControllers.last {
               currentVc = navVc
           } else if let tabVc = (presentedVc as? UITabBarController)?.selectedViewController {
               currentVc = tabVc
           } else {
               currentVc = presentedVc
           }
       }
       return currentVc
   }