title: detect change when back to screen react native
body: <p>I am using <strong>react-native-router-flux</strong> for navigation. I am using <strong>Action.ScreenKeyName</strong> to go to the next screen and for back using <strong>Actions.pop()</strong>. When I go back to the previous screen then I want to reload all the content or data. </p>
  
  <p>unfortunately <strong>componentDidMount,componentWillUnmount</strong> Only call first time load of the screen.</p>
  
  <p>I also used AppState but It's working only for when App goto Background or foreground.</p>