InstantiateViewController null when viewcontroller create in Xcode Builder Interface

Question

After update to Visual Studio 2019 version 16.9, I started using Xcode Interface Builder to continue building your Xamarin.iOS user interfaces.

The problem is when I create new view controller in Xcode Interface Builder and InstantiateViewController, it return null. Before this update, I using Xamarin iOS designer ,it work fine.

Is there any way I can fix it?

Here some screenshot, for better view:-

1. I create storyboard from solution
   
2. I create view controller from Xcode builder interface
   
3. I InstantiateViewController but return null
   
4. I check in Sources Code Editor, storyboardIdentifier name is correct
   

Answer 1

Just found the issue, my namespace in designer.cs should same namespace in viewcontroller.cs. Happy coding.

1) namespace for viewcontroller.cs

2) namespace for designer.cs