Resolved: RootViewController.PresentViewController is not working in Xamarin iOS (C#)

Introduction:
Some times we may get a situation where we need to present a UINavigationController modally and then push UIViewControllers within the UINavigationController. This required to start with the key window's root view controller and then find the most-presented view controller.
Solution:
Depending on the type of window you have loaded getting the RootViewController can be problematic. This version has been the most stable one I've tried thus far and avoids tail recursive loops.

public UIViewController GetRootController()  

       {  

           var root = UIApplication.SharedApplication.KeyWindow.RootViewController;  

           while (true)  

           {  

               switch (root)  

               {  

                   case UINavigationController navigationController:  

                       root = navigationController.VisibleViewController;  

                       continue;  

                   case UITabBarController uiTabBarController:  

                       root = uiTabBarController.SelectedViewController;  

                       continue;  

               }  

  

               if (root.PresentedViewController == null) return root;  

               root = root.PresentedViewController;  

           }  

       } 

Usage: 

1. var presentRootController = GetRootController();  
2.             presentRootController?.PresentViewController(new UINavigationController(uiViewControllerObj), true, null);  

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