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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Holisticon - React Native</title>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<link rel="stylesheet" href="styles/reveal.css" media="all">
<link rel="stylesheet" href="styles/presentation.css" media="all">
<style>
.reveal pre {
width: 100%;
}
.reveal pre code {
max-height: 600px;
</style>
<link rel="shortcut icon" href="images/brand/favicon.png">
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<script>
if( window.location.search.match( /print-pdf/gi ) ) {
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
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link.href = 'bower_components/reveal.js/css/print/pdf.css';
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}
</script>
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<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<div class="slides">
<section data-markdown data-separator="^\n---\n$" data-separator-vertical="^\n--\n$" data-separator-notes="^>NOTES:"><script type="text/template"># React Native
[oliver.ochs@holisticon.de](mailto:oliver.ochs@holisticon.de)
 <!-- .element: class="inline" style="max-height:32px; vertical-align: top; " --> [@holisticon](https://twitter.com/holisticon)
<!-- .slide: class="title" data-background="images/brand/grass_footer.png" data-background-repeat="repeat-x" data-background-position="bottom center" data-background-size="inherit" -->
---
# React
* Open Source View Rendering Library
* von Facebook für eigene Anwendungen <!-- .element: class="fragment" -->
* Motivation: UI-Komponenten besser (vorhersehbarer) entwickeln<!-- .element: class="fragment" -->
---
# Komponenten sind Klassen mit einer Render-Methode
```jsx
var Movie = React.createClass({
render() {
return (
<div>Hello CodeTalks</div>
);
}
});
```
---
# Komponenten haben Properties
```jsx
var Movie = React.createClass({
propTypes : {
item : React.PropTypes.object
},
render() {
return (
<div>
<span><img src={this.props.item.posters.thumbnail} width="80px" /></span>
<span>{this.props.item.title}</span>
<span>{this.props.item.year}</span>
</div>
);
}
});
```
```jsx
<Movie item={{
title: "Hello CodeTalks",
year: "2016",
posters: {
thumbnail: "https://developer.aboutyou.de/..../code.talks13.jpg"
}
}}></Movie>
```
---
# Komponenten haben einen Zustand
```jsx
var MovieList = React.createClass({
getInitialState() {
return {
movies:[]
}
},
fetchData() {
fetch('MoviesExample.json')
.then((response) => response.json())
.then((data) => {
this.setState({
movies : data.movies
})
});
},
componentDidMount : function(){
this.fetchData();
},
});
```
---
# Komponenten lassen sich in einer Hierarchie rendern
```jsx
var MovieList = React.createClass({
render() {
return (
<div>
{this.state.movies.map((result) => {
return (<Movie key={result.id} item={result}></Movie>)
})}
</div>
)
},
});
```
---
# Hands On Code
<!-- .element: style="width:90%" -->
---
# Was ist daran das Besondere?
* Deklarative Programmierung (wie HTML)
* Virtual DOM / Virtual DOM Diffing <!-- .element: class="fragment" -->
* Wiederverwendbare Komponenten <!-- .element: class="fragment" -->
* Methoden und Markup gehören zusammen<!-- .element: class="fragment" -->
* Bleeding Edge JavaScript <!-- .element: class="fragment" -->
* Großes Ökosystem (Redux, Relay, GraphQL, ...) <!-- .element: class="fragment" -->
---
# Going native
* Wir haben bereits eine Website
* Wir können die Webseite in einem WebView rendern <!-- .element: class="fragment" -->
* Mögliche Technologie: Apache Cordova bzw. Adobe PhoneGap, Ionic <!-- .element: class="fragment" -->
---
# User Experience
* Jede Plattform hat ihre Besonderheiten
* Spezifische UI-Controls (z.B. Progress Bar, Radio, ...) <!-- .element: class="fragment" -->
* Unterschiedliche Betriebssystemversionen (iOS 6 vs. iOS 7 - 10) <!-- .element: class="fragment" -->
* Eingeschränkte Gestensteuerung <!-- .element: class="fragment" -->
* Fühlt sich nie echt an <!-- .element: class="fragment" -->
* Ein Smartphone ist kein Desktop-Rechner <!-- .element: class="fragment" -->
* Mark Zuckerbergs "biggest mistake" <!-- .element: class="fragment" -->
---
<!-- .element: style="width:80%" -->
Quelle: [techcrunch.com](http://techcrunch.com/2012/09/11/mark-zuckerberg-our-biggest-mistake-with-mobile-was-betting-too-much-on-html5/)
---
# Native App
* Optimale UX auf allen Plattformen
* Entwicklung für alle Plattformen aufwändig (Swift vs. Java)<!-- .element: class="fragment" -->
* Developer Experience mäßig durch langsamen Roundtrip <!-- .element: class="fragment" -->
* Release Zyklus durch Reviews langsam <!-- .element: class="fragment" -->
* Optimierung (A/B-Tests) schwierig <!-- .element: class="fragment" -->
---
# React Native - A framework for building native apps using react
* Angekündigt 2015, inzwischen relativ stabil
* Deklarative UI (wie HTML)<!-- .element: class="fragment" -->
* Logik in JS (wie im Web)<!-- .element: class="fragment" -->
* Developer Experience wie im Web <!-- .element: class="fragment" -->
* <!-- .element: class="fragment" -->**Learn once, write everywhere**
* kein HTML, kein Browser, keine WebViews <!-- .element: class="fragment" -->
* Native Components <!-- .element: class="fragment" -->
* Touch Handling <!-- .element: class="fragment" -->
* Style & Layout <!-- .element: class="fragment" -->
---
# Projekt aufsetzen
```bash
brew install watchman
brew install flow
npm install -g react-native-cli
react-native init MyFirstProject
```
---
# Ergebnis
```bash
drwxr-xr-x 5 ios
drwxr-xr-x 5 android
drwxr-xr-x 5 node_modules
-rw-r--r-- 1 index.android.js
-rw-r--r-- 1 index.ios.js
-rw-r--r-- 8 package.json
```
---
# Was ist drinnen?
```jsx
import React, { Component } from 'react';
import { Text, View } from 'react-native';
class MyFirstProject 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.ios.js
</Text>
<Text style={styles.instructions}>
Press Cmd+R to reload,{'\n'}
Cmd+D or shake for dev menu
</Text>
</View>
);
}
}
//...
AppRegistry.registerComponent('MyFirstProject', () => MyFirstProject);
```
---
# Projekt ausführen
```bash
react-native run-android
react-native run-ios
```
---
# Movie Component in React
```jsx
var Movie = React.createClass({
propTypes : {
item : React.PropTypes.object
},
render() {
return (
<div>
<span>
<img src={this.props.item.posters.thumbnail} width="80px" />
</span>
<span>{this.props.item.title}</span>
<span>{this.props.item.year}</span>
</div>
);
}
});
```
---
# Movie Component in React Native
```jsx
var Movie = React.createClass({
render() {
return(
<View style={styles.container}>
<View style={styles.imageContainer}>
<Image
style={styles.poster}
source={{uri: this.props.item.posters.thumbnail}}
/>
</View>
<View style={styles.infoContainer}>
<Text style={styles.title}>{this.props.item.title}</Text>
<Text style={styles.info}>{this.props.item.year}</Text>
</View>
</View>
);
}
});
```
---
# Verwendung der Movie Component
```jsx
<Movie item={{
title: "Hello CodeTalks",
year: "2016",
posters: {
thumbnail: "https://developer.aboutyou.de/blog/wp-content/uploads/2014/10/code.talks13.jpg"
}
}}></Movie>
```
---
# Styling
```jsx
const styles = StyleSheet.create({
title: {
fontSize: 20,
textAlign: 'left',
paddingLeft: 8
},
year: {
textAlign: 'left',
padding: 8
},
info: {
textAlign: 'left',
padding: 8
},
poster: {
width: 150,
height: 243,
borderRadius: 12,
},
);
```
---
# Flexbox
* Flexbox ist ein CSS-Modul, das Elemente in einem Container anordnet
* Flexbox kommt aus dem Response Web Design, um unterschiedliche Bildschirmgrößen effektiv zu nutzen<!-- .element: class="fragment" -->
---
# Flexbox
```css
container: {
flex: 1,
flexDirection: 'column',
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF'
},
```
<!-- .element: style="float: right; width: 40%" -->
<!-- .element: style="width:40%" -->
---
# Flexbox
```css
container: {
flex: 1,
flexDirection: 'row',
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF'
},
infoContainer: {
flex: 1,
flexDirection: 'row'
},
```
<!-- .element: style="float: right; width: 40%" -->
<!-- .element: style="width:40%" -->
---
# Flexbox
```css
container: {
flex: 1,
flexDirection: 'row',
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF'
},
infoContainer: {
flex: 1,
flexDirection: 'column'
},
```
<!-- .element: style="float: right; width: 40%" -->
<!-- .element: style="width:40%" -->
---
# ListView
* Kernkomponente
* Vertikaler Scroll-View <!-- .element: class="fragment" -->
* Veränderliche Daten <!-- .element: class="fragment" -->
* Array von Einträgen <!-- .element: class="fragment" --> ```ListView.DataSource``` <!-- .element: class="fragment" -->
* <!-- .element: class="fragment" -->```renderRow``` ist ein Renderer für einen Eintrag
```jsx
<ListView
dataSource={this.state.dataSource}
renderRow={this.renderMovie}
style={styles.listView}
/>
```
<!-- .element: class="fragment" -->
---
# ListView
```javascript
this.state.dataSource = new ListView.DataSource({
rowHasChanged: (row1, row2) => row1 !== row2,
})
this.state.dataSource.cloneWithRows([movie1, movie2, movie3, ....])
```
```javascript
renderMovie(movie) => {
return (
<View style={styles.container}>
<Image
source={{uri: movie.posters.thumbnail}}
style={styles.thumbnail}
/>
<View style={styles.rightContainer}>
<Text style={styles.title}>{movie.title}</Text>
<Text style={styles.year}>{movie.year}</Text>
</View>
</View>
);
}
```
---
# Navigation
* Übergang zwischen Scenes
* Identifikation der Scene über ein Route-Objekt <!-- .element: class="fragment" -->
* Navigation mit einem Navigator-Objekt <!-- .element: class="fragment" -->
```jsx
<Navigator
initialRoute={{name: 'Start', index: 0}}
renderScene={this.renderScene}
/>
```
<!-- .element: class="fragment" -->
---
# Navigation
* Navigator ist vergleichbar mit einem Stack
```jsx
navigator.push({
name: 'MovieDetails',
index: nextIndex,
});
```
<!-- .element: class="fragment" -->
```jsx
<NavigationBar backFunc={navigator.pop} />
```
<!-- .element: class="fragment" -->
---
# Plattformspezifische Komponenten
```bash
-rw-r--r-- 1 MoviePlayer.ios.js
-rw-r--r-- 1 MoviePlayer.android.js
```
<!-- .element: class="fragment" -->
```jsx
import MoviePlayer from './components/MoviePlayer';
```
<!-- .element: class="fragment" -->
---
# Plattformspezifischer Code
```jsx
if (Platform.OS === 'ios') {
// iOS
} else {
// Android
}
```
<!-- .element: class="fragment" -->
```jsx
BackAndroid.addEventListener('hardwareBackPress', () => {
if (navigator && navigator.getCurrentRoutes().length > 1) {
navigator.pop();
}
});
```
<!-- .element: class="fragment" -->
---
# Performance
* JavaScript ist single threaded
* Rendering vom eigentlichen Applikations-Thread getrennt <!-- .element: class="fragment" -->
* JavaScript-Thread (JavaScriptCore) für die Applikations-Logik <!-- .element: class="fragment" -->
* Nativer UI-Thread für das Rendern der Komponenten <!-- .element: class="fragment" -->
* Geschwindigkeit vergleichbar mit "naiv" geschriebenem nativen Code <!-- .element: class="fragment" -->
* Weitere native Threads möglich für langlaufende Berechnungen o.ä. <!-- .element: class="fragment" -->
* FPS (Frames per Second) Monitor <!-- .element: class="fragment" -->
---
# Debugging und Profiling
* Error Reporting
* Inspector, Network etc. <!-- .element: class="fragment" -->
* JavaScript-Thread (JavaScriptCore) für die Applikations-Logik... <!-- .element: class="fragment" -->
* ...lässt sich verlagern in den Chrome-Browser <!-- .element: class="fragment" -->
* <!-- .element: class="fragment" -->Logging: ``react-native log-ios`` <!-- .element: class="fragment" -->
* <!-- .element: class="fragment" -->Warning: ``console.warn('Yellow box');`` <!-- .element: class="fragment" -->
---
# Weitere Themen
* Testing mit [Jest](http://facebook.github.io/jest/)
* <!-- .element: class="fragment" -->Typisierung mit [Flow](https://flowtype.org/)
* <!-- .element: class="fragment" -->Managing State mit [Redux](https://github.com/reactjs/redux)
* <!-- .element: class="fragment" -->Routing mit [React Native Router](https://github.com/aksonov/react-native-router-flux)
* <!-- .element: class="fragment" -->Software-Updates via [Microsoft Code Push](https://github.com/Microsoft/react-native-code-push)
---
# Geeignet für Entwicklung?
* Lary Wall: "Easy things should be easy, and hard things should be possible"
* <!-- .element: class="fragment" -->Leichte Dinge sind möglich (siehe Beispiel)
* <!-- .element: class="fragment" -->Für schwierige Dinge können eigene Components (auch nativ) entwickelt werden
---
# Probleme
* Entwicklung stabil <span>nur unter macOS</span><!-- .element: class="fragment" -->
* Bridging Code selbst schreiben oder suchen<!-- .element: class="fragment" -->
* 3rd Party Module brechen manchmal<!-- .element: class="fragment" -->
* <!-- .element: class="fragment" -->[Platform Parity](https://facebook.github.io/react-native/docs/image.html)
* Leaky Abstraction Layer<!-- .element: class="fragment" -->
---
# Alternativen
* <!-- .element: class="fragment" -->Stop! <span>Wir entwickeln nicht mit React, sondern mit Angular?!</span><!-- .element: class="fragment" -->
* <!-- .element: class="fragment" -->[Telerik Native Script](http://docs.nativescript.org/angular/tutorial/ng-chapter-0)
```javascript
@Component({
selector: "my-app",
template: `
<TextField hint="Email Address" keyboardType="email"
autocorrect="false" autocapitalizationType="none"></TextField>
<TextField hint="Password" secure="true"></TextField>
<Button text="Sign in"></Button>
<Button text="Sign up for Groceries"></Button>
`
})
```
<!-- .element: class="fragment" -->
---
# Danke
Slides: [holisticon.github.io/presentations/code-talks-react-native](https://holisticon.github.io/presentations/code-talks-react-native)
Beispiele: [github.com/simonox/code-talks-react-native](https://github.com/simonox/code-talks-react-native)
[oliver.ochs@holisticon.de](mailto:oliver.ochs@holisticon.de)
[www.holisticon.de](https://www.holisticon.de/blog)
 <!-- .element: class="inline" style="max-height:32px; vertical-align: top; " --> [@oochs](https://twitter.com/oochs)
</script></section>
</div>
<footer>
<img src="images/brand/holisticon-logo-grey.svg" class="holisticon-logo" alt="Holisticon AG">
</footer>
</div>
<script src="scripts/reveal.js"></script>
<script>
// Configure Reveal
// Full list of configuration options available here:
// https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
// The "normal" size of the presentation, aspect ratio will be preserved
// when the presentation is scaled to fit different resolutions. Can be
// specified using percentage units.
width: 1024,
height: 768,
// Factor of the display size that should remain empty around the content
margin: 0.1,
// Display controls in the bottom right corner
controls: true,
// Display a presentation progress bar
progress: true,
// Display the page number of the current slide
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// Push each slide change to the browser history
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// Enable keyboard shortcuts for navigation
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// Vertical centering of slides
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// Enables touch navigation on devices with touch input
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// Loop the presentation
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// Turns fragments on and off globally
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// Stop auto-sliding after user input
autoSlideStoppable: true,
// Factor of the display size that should remain empty around the content
margin: 0.1,
// Bounds for smallest/largest possible scale to apply to content
minScale: 0.5,
maxScale: 100.0,
theme: Reveal.getQueryHash().theme, // available themes are in /css/theme
// Transition speed
transitionSpeed: 'default', // default/fast/slow
transition: Reveal.getQueryHash().transition || 'default', // default/cube/page/linear/fade/none
// Optional libraries used to extend on reveal.js
dependencies: [
{ src: 'scripts/reveal.classList.js', condition: function() { return !document.body.classList; } },
{ src: 'scripts/reveal.marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'scripts/reveal.markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'scripts/reveal.highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
{ src: 'scripts/reveal.zoom.js', async: true, condition: function() { return !!document.body.classList; } },
{ src: 'scripts/reveal.notes.js', async: true, condition: function() { return !!document.body.classList; } },
//{ src: 'scripts/reveal.search.js', async: true, condition: function() { return !!document.body.classList; } },
//{ src: 'scripts/reveal.remotes.js', async: true, condition: function() { return !!document.body.classList; } }
]
});
</script>
</body>
</html>