App.js

import { StatusBar } from 'expo-status-bar';
import React, {useState, useEffect} from 'react';
import { ActivityIndicator, StyleSheet, Text, View } from 'react-native';
import Onboarding from './src/screens/Onboarding';
import HomeScreen from './src/screens/HomeScreen';
import AsyncStorage from '@react-native-async-storage/async-storage';

const Loading = () => {
  return (
    <View>
      <ActivityIndicator size="large" />
    </View>
  );
};


export default App = () => {
  const [loading, setLoading] = useState(true);
  const [viewedOnboarding, setViewedOnboarding] = useState(false);

  const checkOnboarding = async () => {
    try {
      const value = await AsyncStorage.getItem('@viewedOnboarding');
  
      if (value !== null) {
        setViewedOnboarding(true)
      }
    } catch (err) {
      console.log('Error @checkOnBoarding: ', err)
    } finally {
      setLoading(false)
    }
  }
  
  useEffect(() => {
    checkOnboarding();
  },[])
  
  return (
    <View style={styles.container}>
      {loading ? <Loading/> : viewedOnboarding ? <HomeScreen/> : <Onboarding/> }
      <StatusBar style="auto" />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});