title: ReactNative: How to check if the user has granted permission to gps
body: <p>In iOS, I am checking if the app has permissions to access the gps when opening the app. If not, I show an alert to cancel or accept, which opens the settings menu. But I can't find a way to check it once the user has turned on/off the gps in the settings menu and goes back to the app.
  I want to wait for the user to come back from settings and check it again.</p>
  
  <p>I am using <code>navigator.geolocation.getCurrentPosition()</code> , <code>Permissions.request("location")</code> and <code>if (Permissions.canOpenSettings()){
        Permissions.openSettings()...</code></p>