App.js

import React, { useState, useEffect } from 'react';
import { NavigationContainer } from '@react-navigation/native';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import Ionicons from 'react-native-vector-icons/Ionicons';

import Chat from './chat'
import Home from './home'

export default function App() {

  const Tab = createBottomTabNavigator();

  return (
    <NavigationContainer>

      <Tab.Navigator
        screenOptions={({ route }) => ({
          tabBarIcon: ({ focused, color, size }) => {
            let iconName;

            if (route.name === 'Home') {
              iconName = focused
                ? 'ios-information-circle'
                : 'ios-information-circle-outline';
            } else if (route.name === 'Chat') {
              iconName = focused ? 'ios-person' : 'ios-person';
            }

            // You can return any component that you like here!
            return <Ionicons name={iconName} size={size} color={color} />;
          },
        })}
        tabBarOptions={{
          activeTintColor: 'tomato',
          inactiveTintColor: 'gray',
        }}
      >
        <Tab.Screen name="Home" component={Home} />
        <Tab.Screen name="Chat" component={Chat} />

      </Tab.Navigator>

    </NavigationContainer>
  )
}