title: Remove under line in table view
body: <p>I want to remove this line in TableView.</p>
  
  <p>I use </p>
  
  <pre><code>tableView.tableFooterView = UIView(frame: CGRect.zero) , 
   tableView.tableFooterView?.isHidden = true, 
   tableView.tableFooterView = nil`, 
   tableView.tableFooterView = UIView(frame: CGRect(x: 0, y: 0, width: tableView.frame.size.width, height: 1))`,
  </code></pre>
  
  <p>Set style tableView to grouped and set separator to none is not work.</p>
  
  <p><img src="https://i.stack.imgur.com/OcJWk.png" alt="image"></p>