App.js

import { Ionicons } from '@expo/vector-icons';
import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
import { useFonts } from 'expo-font';
import * as SplashScreen from 'expo-splash-screen';
import * as React from 'react';
import { Platform, StatusBar, StyleSheet, View } from 'react-native';

import BottomTabNavigator from './navigation/BottomTabNavigator';
import useLinking from './navigation/useLinking';

const Stack = createStackNavigator();

export default function App(props) {
  const [isLoadingComplete, setLoadingComplete] = React.useState(false);
  const [initialNavigationState, setInitialNavigationState] = React.useState();
  const containerRef = React.useRef();
  const { getInitialState } = useLinking(containerRef);

  // Load fonts
  const [loaded] = useFonts({
    'space-mono': require('./assets/fonts/SpaceMono-Regular.ttf')
  });

  // Load any resources or data that we need prior to rendering the app
  React.useEffect(() => {
    const loadResourcesAndDataAsync = async () => {
      try {
        SplashScreen.preventAutoHideAsync();

        // Load our initial navigation state
        setInitialNavigationState(await getInitialState());
      } catch (e) {
        // We might want to provide this error information to an error reporting service
        console.warn(e);
      } finally {
        setLoadingComplete(true);
        SplashScreen.hideAsync();
      }
    };

    loadResourcesAndDataAsync();
  }, []);

  if (!loaded || (!isLoadingComplete && !props.skipLoadingScreen)) {
    return null;
  } else {
    return (
      <View style={styles.container}>
        {Platform.OS === 'ios' && <StatusBar barStyle="default" />}
        <NavigationContainer ref={containerRef} initialState={initialNavigationState}>
          <Stack.Navigator>
            <Stack.Screen name="Root" component={BottomTabNavigator} />
          </Stack.Navigator>
        </NavigationContainer>
      </View>
    );
  }
}

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