title: Detect when view controller appears from pop
body: <p>I am popping a view controller deep within a navigation stack. Is it possible to detect if the view controller is being shown from a push or a pop?</p>
  
  <pre><code>nav stack:
  
  [A] -&gt; [B] -&gt; [C] -&gt; [D] -&gt; [E]
  </code></pre>
  
  <p>[E] pops to [B]</p>
  
  <pre><code>nav stack:
  
  [A]  -&gt; [B] // Possible to detect if B appears from a pop?
  </code></pre>