How to detect if an alert was shown in react native?

I am using react-native-push-notification and I need to change screens only after a user has made a decision whether or not they want push notifications from my app. But once onRegister: function(token) is encountered, a system alert is automatically shown by iOS. How do I listen to the user making a selection on this system alert box?

To listen to the user's decision.

PushNotification.requestPermissions().then((response: any) => {
  if (response && response.alert !== 0) {
    // Allow
    return; 
  }
  // Decline
});