title: Resolve constraint conflicts when decreasing height of UITableViewCell
body: <p>I have implemented a custom <code>UITableViewCell</code> that has a <code>UISlider</code> with two <code>UIVimageView</code>s to the left and right of it in the cells' <code>contentView</code>. I've set up Auto Layout constraints for these elements. The <code>UISlider</code> has top and bottom vertical spacing constraints to the <code>contentView</code> with leading and trailing set to the images. The images also have top and bottom vertical spacing constraints to the <code>contentView</code>. This works great, but I need to have the ability to 'remove' these cells at some point in time and I do so by changing the height of the <code>UITableViewCell</code> to 0. This works just fine - there are no appearance issues, even after expanding the cells again. The only issue is an auto layout issue is logged to console when I collapse the cell: </p>
  
  <pre><code>Unable to simultaneously satisfy constraints.
  Will attempt to recover by breaking constraint 
  &lt;NSLayoutConstraint:0x170489010 UITableViewCellContentView:0x155eadd80.bottomMargin == UISlider:0x155eac820.bottom&gt;
  </code></pre>
  
  <p>How can this be resolved?</p>