title: Hide first subview in stackview and other disappears on iOS 10.2 but not 11
body: <p>Confused on this one...</p>
  
  <p>I have a stackview in a tableview cell. 
  The stackview (Center, Equal Spacing) has two sub stackviews,
  Left stackview (Fill, Fill) has a UIButton (infoButton) and UILabel (Description)
  Right stackview (Fill, Fill) has just UILabel</p>
  
  <p>When I set infoButton.isHidden = true, Description is nowhere to be seen on iOS 10.2.  On iOS 11.1 it works as expected.</p>
  
  <p>Thanks for taking a look!</p>
  
  <p>Image: iOS 11.1 on left, iOS 10.2 on right.</p>
  
  <p>Additional Info:</p>
  
  <pre><code>if (input.Help == ""){
      aCell.infoButton.isHidden = true
  } else {
      aCell.infoButton.isHidden = false
      aCell.infoButton.tag = i
      aCell.infoButton.isUserInteractionEnabled = true
      aCell.infoButton.addGestureRecognizer(tap)
  }
  </code></pre>
  
  <p>Solved: I changed the Stack View (that contains the button and label together) to Alignment 'Center' instead of 'Fill'. The Stackview height had been changing to 0 as observed in the View Debugger (thank you Matt for pointing me to the debugger!)</p>
  
  <p><a href="https://i.stack.imgur.com/3XwCI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3XwCI.png" alt="iOS 11.1 on left, 10.2 on right"></a></p>