export NavigationToolBarIOS

index.js

 import Navigation from './src/Navigation';
 import Screen from './src/Screen';
 import RctActivity from './src/modules/RctActivity';
+import { NavigationToolBarIOS } from 'react-native-controllers';
 
 export {
   Navigation,
   Screen,
-  RctActivity
+  RctActivity,
+  NavigationToolBarIOS
 };