nav.container.js

import React from 'react';
import { RootAndroid } from '../routes.config.android';
import { RootIOS } from '../routes.config.ios';
import { Platform } from 'react-native';

import { connect } from 'react-redux';
import { addNavigationHelpers } from 'react-navigation';

class Nav extends React.Component {
  render() {
    const { dispatch, navigationState } = this.props;
    if (Platform.OS === 'ios') {
      return <RootIOS navigation={addNavigationHelpers({ dispatch, state: navigationState })} />;
    } else {
      return <RootAndroid navigation={addNavigationHelpers({ dispatch, state: navigationState })} />;
    }
  }
}

const mapStateToProps = (state) =>
  {
  return {
    navigationState: state.nav
  }
}

Nav.propTypes = {
  dispatch: React.PropTypes.func,
  navigationState: React.PropTypes.object
}

export default connect(mapStateToProps)(Nav);