SafeAreaView IphoneX (react-native)

createMaterialTopTabNavigator.js

import React from 'react'
import { SafeAreaView } from 'react-native'
import { createMaterialTopTabNavigator, MaterialTopTabBar } from 'react-navigation'


function SafeAreaMaterialTopTabBar (props) {
  return (
    <SafeAreaView>
      <MaterialTopTabBar {...props} />
    </SafeAreaView>
  )
}

const MyNav = createMaterialTopTabNavigator({
  ...
}, {
  ...
  tabBarComponent: SafeAreaMaterialTopTabBar
})