title: UITextField AutoFill not filling when text fields are embedded in storyboard
body: <p>Here is the layout that I use:</p>
  <p><a href="https://i.stack.imgur.com/WtDQx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WtDQx.png" alt="Storyboard" /></a></p>
  <p>When I use AutoFill feature, it fills only the focused text field, for example the first one:</p>
  <p><a href="https://i.stack.imgur.com/CX1AX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CX1AX.png" alt="Screenshot 1" /></a>
  <a href="https://i.stack.imgur.com/cmALZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cmALZ.png" alt="Screenshot 2" /></a></p>
  <p>In the simple layout when all the fields are placed in the same view controller everything works fine. <code>textContentType</code> is set correctly to <code>.username</code> and <code>.password</code>.</p>
  <p>I tested this on both device and simulator with the same results.</p>
  <p>Full example on GitHub: <a href="https://github.com/silvansky/AutoFillTest" rel="nofollow noreferrer">https://github.com/silvansky/AutoFillTest</a></p>
  <p>What should I do to tell iOS these fields are related to each other and should be filled together even if they are from different view controllers?</p>