title: React Native Pass properties on navigator pop
body: <p>I'm using NavigatorIOS on my react native app. I want to pass some properties when navigating back to previous route. </p>
  
  <p>An example case:
  I'm in a form page. After submitting data, I want to go back to the previous route and do something based on the submitted data</p>
  
  <p>How should I do that ?</p>