Introducción a React Native

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a new approach Miguel Araujo (@maraujop) Jorge Maroto (@patoroco)

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@ticketeaeng

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We tried several options (including native) Why React Native at ticketea? 3

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Framework by facebook Using React Easy bridging native code Multiplatform apps written in JavaScript (actually ES2015) What is React Native? 4

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Native modules JavaScript side Objective-C Java Bridging native code 6

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WHAT IS REACT?

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It's a pattern supported by a library Different implementations: ReactJS / React Native Everything in React is a component Data ﬂow is unidirectional What is React? 8

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Everything is a component 9

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Not a webview Not a 100% code reuse Closer to frontend development than native development What is not React Native? 11

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React always re-renders Every component has a 2 important things state properties (props) Virtual DOM 12

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Diﬀerences in virtual DOM 13

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State changes 14

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Support for iOS / Android index.ios.js / index.android.js ToastAndroid / ActivityIndicatorIOS Diﬀerences between Android / iOS 15

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GETTING STARTED

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There is a great getting started tutorial from facebook Better on OS X XCode > 7.0 / Android 6.0 (API 23) node 4.0 + watchman + ﬂow npm install -g react-native-cli Getting started 17

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react-native init . ├── android ├── index.android.js ├── index.ios.js ├── ios ├── node_modules └── package.json react-native init 18

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Only compile when native code added react-native run-android compile on XCode facebook packager react-native start Autoreload on JavaScript changes Development process 19

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Hello this.props.propName this.props.children JSX & props 20

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Components lifecycle 21 http://javascript.tutorialhorizon.com/2014/09/13/execution-sequence-of-a-react-components-lifecycle-methods/

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Components lifecycle 22 http://javascript.tutorialhorizon.com/2014/09/13/execution-sequence-of-a-react-components-lifecycle-methods/

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Components lifecycle 23 http://javascript.tutorialhorizon.com/2014/09/13/execution-sequence-of-a-react-components-lifecycle-methods/

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Components lifecycle 24 http://javascript.tutorialhorizon.com/2014/09/13/execution-sequence-of-a-react-components-lifecycle-methods/

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Not storyboards (and much less autolayout) either XML layouts CSS + flexbox as styling language Design & layout 25

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HELLO NSCODERS

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All examples will be on Android simulator emulator DISCLAIMER

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DEMO TIME

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SHOW ME THE CODE

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EVENTCARD

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EVENTSTREAM

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EXTRA BALL

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react-native bundle Crashlytics (ɑ) iTunes Connect (β / prod.) Google Play (ɑ / β / prod.) Deploy 45

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Single place for our state Predictable code ﬂow Redux has been very easy to test Flux & Redux 46

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CONCLUSIONS

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Blocking animations Some inconsistencies between iOS / Android We’ve hit around 12 bugs and reported some Early adopting on Android Issues 48

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Sharing code between platforms (including tests) Testing in JS-way (no simulator needed) Web developers can easily jump into react-native Some things are done faster (less boilerplate) React and redux are a killer combo Learning curve Advantages 49

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Missing more best practices Storyboards vs. (JSX + ﬂexbox) (Swift / Obj-C / Java / Kotlin) vs. JS Mature ecosystem with less WTF/min More libraries available Disadvantages 50