Basic app.js with two screens.

two-screen-app-js.js

import React, { Component } from 'react';
import {
  Platform,
  StyleSheet,
  Text,
  ScrollView,
  Button,
  Image
} from 'react-native';

export default class App extends Component<{}> {

  constructor(props) {
    super(props);

    this.state = {
      showImages: false
    };

  }

  render() {
    return (
      <ScrollView style={styles.container}>
        <Button title={"Toggle Screen"} onPress={ () => { this.setState({ showImages: !this.state.showImages}) } } />
        {! this.state.showImages && <Text style={styles.welcome}>Home Screen</Text> }
        {this.state.showImages && <Text style={styles.welcome}>Image Screen</Text> }
        {this.state.showImages && <Image style={styles.image} source={{uri: 'https://i.imgur.com/kPkQTic.jpg'}} permanent={false} /> }
        {this.state.showImages && <Image style={styles.image} source={{uri: 'https://i.redd.it/uwvjph19mltz.jpg'}} permanent={false} /> }
        {this.state.showImages && <Image style={styles.image} source={{uri: 'https://i.redd.it/39w0xd9ersxz.jpg'}} permanent={false} /> }
      </ScrollView>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    padding: 10
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  image: {
    width:150,
    height: 204
  }
});