how its called

SiteTabNavigator.js

class HomeIconComponent extends React.Component {
  handleNavigation = () => {
    const { navigation, focused } = this.props
    if (!focused){
      navigation.navigate("Home")
    }else if (navigation.state.index == 0){
      if (navigation.state.routes[navigation.state.index].index != 0){
        navigation.goBack(null)
      }
    } else if (navigation.state.index == 1 || navigate.state.index == 2){
      navigation.navigate("Home")
    }

  }
  render(){
    const { navigation, focused } = this.props

    return(
      <TouchableOpacity onPress={() => navigation.goBack() } style={{ justifyContent: 'center'}}>
        <Ionicons name="md-home" size={30} color={focused ? Colors.buttonBlue : '#404040'}/>
      </TouchableOpacity>

    )
  }

}

export default TabNavigator(

  {
    SiteDrawer: {
      screen: SiteDrawer,
      navigationOptions: ({ navigation }) => ({
        tabBarIcon: ({ tintColor, focused }) => (
            <Ionicons focused={focused} color={tintColor} name={Platform.OS === 'ios' ? `ios-information-circle${focused ? '' : '-outline'}` : 'md-information-circle' } />
        ),
      })
    },
    Control: {
      screen: SiteControlScreen,
      navigationOptions: ({ navigation }) => ({
        tabBarIcon: ({ tintColor, focused }) => (
            <Ionicons focused={focused} color={tintColor} name={Platform.OS === 'ios' ? `ios-link${focused ? '' : '-outline'}` : 'md-link' } />
        ),
      })
    },
    Pressure: {
      screen: SitePressureScreen,
      navigationOptions: ({ navigation }) => ({
        tabBarIcon: ({ tintColor, focused }) => (
            <Ionicons focused={focused} color={tintColor} name={Platform.OS === 'ios' ? `ios-options${focused ? '' : '-outline'}` : 'md-options' } />
        ),
      })
    },

    Home: {
        screen: MainTabNavigator,
        navigationOptions: ({ navigation }) => ({
            tabBarIcon: ({ tintColor, focused }) => (
                <HomeIconComponent color={tintColor} navigation={navigation} focused={focused}/>
            ),
        })
    },





  }
)