title: How to hide TabBar Text in TabNavigator?
body: <p>I'm using TabNavigator from 'react-navigation'. I want to hide or remove Text under icons.</p>
  
  <p><a href="https://i.stack.imgur.com/Z88f2.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Z88f2.png" alt="enter image description here"></a></p>
  
  <p>Here is a part of TabNavigator. (I'm using Expo)</p>
  
  <pre><code>    Camera: {
        screen: CameraScreen,
      },
      Noti: {
        screen: NotificationScreen,
      },
      Menu: {
        screen: MenuStackNavigator,
      },
    },
    {
      navigationOptions: ({ navigation }) =&gt; ({
           header: null, &lt;&lt;&lt;
           tabBarIcon: ({ focused }) =&gt; {
                       ...
           },
       }),
       header: null, &lt;&lt;&lt;-
       headerMode: 'none',  &lt;&lt;--       
       tabBarComponent: TabBarBottom,
       tabBarPosition: 'bottom',
       animationEnabled: false,
       swipeEnabled: false,
       backBehavior: 'none',
  </code></pre>
  
  <p>And this is CamaraScreen</p>
  
  <pre><code>class CameraScreen extends Component {
    static navigationOptions = {
      title: 'Camera'
    }
  </code></pre>