title: React Native/Expo: Event Emitter between screens; trigger refresh
body: <p>I've scoured this site and various Github issues for a solution but am still a bit stuck. In essence, this is the flow that I desire:</p>
  
  <ol>
  <li>Land on first component/screen, which has some information</li>
  <li>Click a button and be pushed to a second component/screen</li>
  <li>Do something on this second component/screen</li>
  <li>Pop back to first component/screen</li>
  <li>Have refreshed information be displayed when we come back to this page</li>
  </ol>
  
  <p>Issues:</p>
  
  <ul>
  <li>Component lifecycles don't work because when I'm popping from the second component to the first component (the parent), there's no component lifecycle method I can call in this case.</li>
  <li>Event Emitters won't suffice as a solution because they only work within a single component (is this correct btw?)</li>
  </ul>
  
  <p>Would greatly appreciate any help I can get. Thank you!</p>