title: React native, detect screen resume
body: <p>Suppose you navigate like the following</p>
  
  <pre><code>screen-a (initial)
  screen-b (push)
  screen-a (pop)
  </code></pre>
  
  <p>I think in android, we could use <code>onResume</code> of an activity to track the screens</p>
  
  <p>Is there something like <code>onResume</code> in react-native?</p>
  
  <p>I'm not talking about application status, I'm after individual view (which would be something like Activity in android, ViewController in iOS)</p>