React Native

John Machahuay Giraldo

@Johnp_js on Twitter & Github

About Me

• UI developer at Belatrix
• Originally a Web developer, now doing both web and mobile development
• Now building an app for IOS and android with React Native

Overview

• Hybrid Apps
• What is React Native
• Debugging
• Demo
• Resources

Hybrid Apps

Hybrid Apps Are

• "mobile web app", an "HTML5 app"
• A web view run the web app
• Access to native APIs
• Write once, deploy everywhere
• UI Components are html with css   link

React Native Is An

Extension of Hybrid

React Native

• UI native componentes        link
• Open sourced and maintained by Facebook
• Apps written in Javascript
• Learn once, write anywhere
• 80% - 90% code reuse
• Compiles to real native mobile applications

React Native

• Supported operating systems are >= Android 4.1 (API 16) and >= iOS 8.0.
• No HTML
• No CSS directly - Flexbox
• No WebView

<div> == <View>
<p> || <span> == <Text>
<button> == <TouchableHighlight>
<img /> == <Image />
<input /> == <TextInput />

React Native vs React

import React, { Component } from 'react';

class SomeComponent extends Component {
  render () {
    return (
      <div>
        <p>Hello World</p>
      </div>
    )
  }
}

React  (web)

React Native vs React

import React, { Component } from 'react';
import { Text, View } from 'react-native';

class SomeComponent extends Component {
  render () {
    return (
      <View>
        <Text>Hello World</Text>
      </View>
    )
  }
}

React Native (mobile)

React Native - Production

• Facebook
• Instagram
• Discovery
• Souncloud
• Airbnb
• Wix

  more apps

Getting Started

• Install Node
• brew install watchman
• brew install flow (optional)
• npm install -g react-native-cli
• react-native init DemoApp
• react-native run-ios
• react-native run-android

Show me the Code

Components

class MyComponent extends Component {
  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Welcome to React Native!
        </Text>
        <Text style={styles.instructions}>
          To get started, edit index.android.js
        </Text>
        <Text style={styles.instructions}>
          Shake or press menu button for dev menu
        </Text>
      </View>
    );
  }
}

AppRegistry.registerComponent('MyComponent', () => MyComponent);

Styles

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

Network

fetch('https://myapi.com/endpoint/', {
  method: 'POST',
  headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    firstParam: 'yourValue',
    secondParam: 'yourOtherValue',
  })
});

Components

Demo!

https://github.com/JohnProg/react-native-youtube-clone

Why use it?

Native look and feel

Performance

Developer Efficiency

React Native is extensible

Learn Once, Write Anywhere

Resources

• https://www.toptal.com/mobile/comparing-react-native-to-cordova
• https://developers.soundcloud.com/blog/react-native-at-soundcloud
• http://mrn.js.org/
• https://facebook.github.io/react-native/releases/next/docs/getting-started.html#content

Thank You

John Machahuay

@Johnp_js on Twitter & Github