title: iOS: 3 UILabels under each other constraints
body: <p>I have 3 <code>UILabes</code>under each other. Top constraint of the first one is <code>20</code> to <code>superview</code>, second one is <code>20</code> to <code>first label</code>. 3rd is <code>20</code> to the <code>second</code> one. But sometimes first and second label's texts are empty. And I just want to make my 3rd label become <code>20</code> to <code>superview</code>, but when my constraints are set it becomes <code>20+20+20 to superview.</code></p>
  
  <p>Is it possible to fix this only using storyboard or I have to use some code.</p>
  
  <p>I am sorry for my poor english, help me out. </p>