title: UITextView in a grouped UITableView's cell
body: <p>Please, explain me: how to programmatically create an UITextView in UITableViewCell (UITableView has a grouped style). The text view size should be equal to size of the cell.</p>
  
  <p>The UITextView has a gap between its text and its border (top left corner), so I need the correct coordinates to properly place the text view on a cell.</p>
  
  <p><strong>UPDATE</strong>: I've solved my question. See my self-answer below. Thanks!</p>