title: Create a constraint for Bottom Layout guide in a XIB
body: <p>I’m updated an app that was built using XIB’s.  In one of the XIB’s I have the view then some objects inside, one being a tableview.  I put a constraint for the bottom and it lists like so:</p>
  
  <pre><code>Bottom Space to: Superview
           Equals: 5
  </code></pre>
  
  <p>Depending on the device, the tableview will extend beyond the screen at the bottom, not extend all the way &amp; sometimes lines up just right.  Out of curiosity I created a test project that uses stroyboards(which I have more experience with) &amp; I created the same scenario but being that the View Controller Scene uses Top &amp; Bottom Layout guides my constraint for the bottom looks like so:</p>
  
  <pre><code>Bottom Space to: Bottom Layout Guide
           Equals: 5
  </code></pre>
  
  <p>This works perfectly on all devices; the tableview lines up with the bottom of the screen.<br>
  So my question is how do I get the same constraint in my XIB to line up to the bottom if I don’t have a Bottom Layout Guide as an option?</p>
  
  <p><img src="https://i.stack.imgur.com/uKCJW.png" alt="enter image description here"></p>