HomeScreen.js

import React, { Component } from 'react'
import {
  Container,
  Header,
  Title,
  Content,
  Text,
  Button,
  Icon,
  Left,
  Right,
  Body,
  List,
  ListItem
} from 'native-base'

import NavBar from '../components/NavBar'

export default class HomeScreen extends Component {

  constructor(props) {
    super(props)
    console.log('home', this.props)
  }

  _setParentState(args){
    this.props.setParentState(args)
  }
  
  componentWillMount () {
    this._setParentState({'drawerDisabled': false})
  }

  componentWillReceiveProps(nextProps) {
    console.log('home - next props', nextProps)
  }

  render() {
    return (
      <Container>
        <NavBar route={this.props.route} navigator={this.props.navigator} emitter={this.props.emitter} /> 
        <Content>
          <Button onPress={() => this.props.navigator.push({id: 'client'})}>
            <Text>Go to Client</Text>
          </Button>
          <Button onPress={() => this._setParentState({'drawerDisabled': false})}>
            <Text>Active Drawer</Text>
          </Button>
         </Content>
      </Container>
    )
  }
}