App.js

import React from "react";
import { Platform, StatusBar, StyleSheet, View } from "react-native";
import { AppLoading, Asset, Font, Icon } from "expo";
import { PersistGate } from 'redux-persist/integration/react';
import { Provider } from 'react-redux';

import { Navigator } from './navigation';
import configureStore from "./configureStore";
import LoadingScreen from './screens/LoadingScreen';


export const { persistor, store } = configureStore();
console.disableYellowBox = true;

console.disableYellowBox = true;
export default class App extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      isLoadingComplete: false,
    };
  }

  render() {
    if (!this.state.isLoadingComplete && !this.props.skipLoadingScreen) {
      return (
        <AppLoading
          startAsync={this._loadResourcesAsync}
          onError={this._handleLoadingError}
          onFinish={this._handleFinishLoading}
        />
      );
    } else {
      return (
        <Provider store={store}>
          <PersistGate loading={<LoadingScreen />} persistor={persistor}>
            <View style={styles.container}>
              {Platform.OS === "ios" && <StatusBar barStyle="default" />}
              <Navigator />
            </View>
          </PersistGate>
        </Provider>
      );
    }
  }

  _loadResourcesAsync = async () => {
    return Promise.all([
      Asset.loadAsync([
        require("./assets/images/robot-dev.png"),
        require("./assets/images/robot-prod.png"),
      ]),
      Font.loadAsync({
        // This is the font that we are using for our tab bar
        ...Icon.Ionicons.font,
        // We include SpaceMono because we use it in HomeScreen.js. Feel free
        // to remove this if you are not using it in your app
        "space-mono": require("./assets/fonts/SpaceMono-Regular.ttf"),
        Roboto: require("native-base/Fonts/Roboto.ttf"),
        Roboto_medium: require("native-base/Fonts/Roboto_medium.ttf"),
        Ionicons: require("@expo/vector-icons/fonts/Ionicons.ttf"),
      }),
    ]);
  };

  _handleLoadingError = error => {
    // In this case, you might want to report the error to your error
    // reporting service, for example Sentry
    console.warn(error);
  };

  _handleFinishLoading = () => {
    this.setState({ isLoadingComplete: true });
  };
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
  },
  loading: {
    top: '50%',
  },
});