class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
		myVariable: '',
		open: false
	};
  }

  drawerContent = () => {
    return (
      <Menu>
        <TextField>Oop</TextField>
      </Menu>
    );
  };

  toggleOpen = () => {
    this.setState({ open: !this.state.open });
  };

  static navigationOptions = ({navigation}) => {
    return {
      title: 'Hom',
      headerLeft: navigation.state.params ? navigation.state.params.headerLeft : null,
      headerStyle: {
        backgroundColor: '#f4511e',
      },
      headerTintColor: '#fff',
      headerTitleStyle: {
        fontWeight: 'bold',
      },
    }
  };






  componentDidMount() {
    const { navigation } = this.props;
    navigation.setParams({
      headerLeft: (
        <Icon name='menu' onPress={this.toggleOpen} />
      ),
    })
  }