App.tsx

import * as React from "react";
import {
  Animated,
  Button,
  Dimensions,
  StyleSheet,
  Text,
  View,
} from "react-native";
import { SystemBars } from "react-native-bars";
import * as BootSplash from "react-native-bootsplash";
import { requestNotifications } from "react-native-permissions";

const bootSplashLogo = require("./assets/bootsplash_logo.png");

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: "center",
    alignItems: "center",
    backgroundColor: "#F5FCFF",
  },
  text: {
    fontSize: 24,
    fontWeight: "700",
    margin: 20,
    lineHeight: 30,
    color: "#333",
    textAlign: "center",
  },
  bootsplash: {
    flex: 1,
    justifyContent: "center",
    alignItems: "center",
    backgroundColor: "#F5FCFF",
  },
  logo: {
    height: 89,
    width: 100,
  },
});

const fakeApiCallWithoutBadNetwork = (ms: number) =>
  new Promise((resolve) => setTimeout(resolve, ms));

export const App = () => {
  const [bootSplashIsVisible, setBootSplashIsVisible] = React.useState(true);
  const [bootSplashLogoIsLoaded, setBootSplashLogoIsLoaded] =
    React.useState(false);
  const opacity = React.useRef(new Animated.Value(1));
  const translateY = React.useRef(new Animated.Value(0));

  const init = async () => {
    // You can uncomment this line to add a delay on app startup
    // await fakeApiCallWithoutBadNetwork(3000);

    try {
      await BootSplash.hide();

      Animated.stagger(250, [
        Animated.spring(translateY.current, {
          useNativeDriver: true,
          toValue: -50,
        }),
        Animated.spring(translateY.current, {
          useNativeDriver: true,
          toValue: Dimensions.get("window").height,
        }),
      ]).start();

      Animated.timing(opacity.current, {
        useNativeDriver: true,
        toValue: 0,
        duration: 150,
        delay: 350,
      }).start(() => {
        setBootSplashIsVisible(false);
      });
    } catch (error) {
      setBootSplashIsVisible(false);
    }
  };

  React.useEffect(() => {
    bootSplashLogoIsLoaded && init();
  }, [bootSplashLogoIsLoaded]);

  return (
    <View style={styles.container}>
      <SystemBars barStyle="dark-content" />

      <Text style={styles.text}>Hello, Dave.</Text>

      <Button
        title="Activate push notifications"
        onPress={() => {
          requestNotifications(["alert"]);
        }}
      />

      {bootSplashIsVisible && (
        <Animated.View
          style={[
            StyleSheet.absoluteFill,
            styles.bootsplash,
            { opacity: opacity.current },
          ]}
        >
          <Animated.Image
            source={bootSplashLogo}
            fadeDuration={0}
            resizeMode="contain"
            onLoadEnd={() => setBootSplashLogoIsLoaded(true)}
            style={[
              styles.logo,
              { transform: [{ translateY: translateY.current }] },
            ]}
          />
        </Animated.View>
      )}
    </View>
  );
};