Is there a way to hide the keyboard?

I use some code found on this forum — and I apologise that I don’t have the author’s details recorded — to call ResignFirstResponder in an extension method:

Public Sub ClearFocus(extends c as iOSControl)

  Declare Sub resignFirstResponder Lib "Foundation.Framework" selector "resignFirstResponder"(obj_id As Ptr)
  
  resignFirstResponder(c.handle)

End Sub