title: Allign UIViews differnt when some UIViews are hidden?
body: <p>I have the following view layouted with autolayout. </p>
  
  <pre><code>--------
  
  
   +
  
  
  --------
  </code></pre>
  
  <p>The plus icon is centered vertically on the cell. This should be different when a second icon appears as you can see on the following image:</p>
  
  <pre><code>--------
  
  
   +
  
   X
  
  --------
  </code></pre>
  
  <p>I this case both icons together should be alligined vertically centered with a space of 5 between them.</p>
  
  <p>I create my constraints in code no interface builder or Storyboard.</p>
  
  <p><strong>How can I achieve this with autolayout?</strong></p>