Drawer button toggle not working in native-base

Question

I'm new to swift and i'm trying to toggled the drawer in native base. Opening the drawer works fine, but once clicked the same button it wont toggle (not closing). Code as bellow.

import React, { Component } from 'react';
import {
 Platform,
 StyleSheet,
 Dimensions,
 Text,
 View
} from 'react-native';
import { Drawer } from 'native-base';

    export default class App extends Component {
      closeDrawer=()=> {
        this._drawer._root.close()
      };
      openDrawer=()=> {
        this._drawer._root.open()
      };

      render() {
        return (
          <Drawer
            openDrawerOffset={(Dimensions.get('window').width) / 2}
            styles={drawerStyles}
            ref={(ref) => { this._drawer = ref; }}
            content={<MenuBar navigator={this._navigator} />}
             >
            <View style={{ flex: 1 }} >
              <View>
                <Header openDrawerClicked={this.openDrawer}/>
              </View>
           </View>

         </Drawer>
    );
  }
}
const drawerStyles = {
  drawer: { paddingTop: 113, shadowColor: '#000000', shadowOpacity: 0.5, shadowRadius: 3,  paddingBottom:60},
}

Output