Tadeu Zagallo, Facebook, London — React Native Architecture Overview

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REACT NATIVE Internals @tadeuzagallo #reactamsterdam

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ABOUT Me @tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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WHAT HAPPENS WHEN YOU TYPE A URL INTO YOUR BROWSER AND PRESS ENTER? @tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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What HAPPENS WHEN YOU RUN A React Native APP? @tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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▸ No WebView ▸ No HTML ▸ No CSS @tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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import React, { Component, } from 'react'; import { AppRegistry, Text, } from 'react-native'; class SampleApp extends Component { render() { return ( Hello, World! ); } } AppRegistry.registerComponent('SampleApp', () => SampleApp); @tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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@implementation MyNativeModule RCT_EXPORT_MODULE() @end @tadeuzagallo #reactamsterdam

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@implementation MyNativeModule + (NSString *)moduleName { return @""; } + (void)load { RCTRegisterModule(self); } @end @tadeuzagallo #reactamsterdam

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{ "remoteModuleConfig":[ // [ $moduleName, $exportedConstants:{}? $methods:[]?, $asyncIndexes:[]? ] ["RCTStatusBarManager",["getHeight","setStyle","setHidden","setNetworkActivityIndicatorVisible"]], ["RCTSourceCode",{"scriptURL":"http:\/\/localhost:8081\/index.ios.bundle?platform=ios&dev=true"},["getScriptText"],[0]], ["RCTAlertManager",["alertWithArgs"]], ["RCTExceptionsManager",["reportSoftException","reportFatalException","updateExceptionMessage","reportUnhandledException"]], // ... ] } @tadeuzagallo #reactamsterdam

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@tadeuzagallo #reactamsterdam

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VM Basics @tadeuzagallo #reactamsterdam

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// import React, { // Component, // } from 'react'; // // import { // AppRegistry, // Text, TouchableHighlight, // } from 'react-native'; // // class SampleApp extends Component { onPress() { alert('Hello, World!'); } // render() { // return ( Button ; // ); // } // } // // AppRegistry.registerComponent('SampleApp', () => SampleApp); @tadeuzagallo #reactamsterdam

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class SampleApp extends Component { onPress() { -> alert('Hello, World!'); } ... } @tadeuzagallo #reactamsterdam

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if (Platform.OS === 'ios') { AlertIOS.alert(title, message, buttons); } else if (Platform.OS === 'android') { AlertAndroid.alert(title, message, buttons); } @tadeuzagallo #reactamsterdam

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// import React, { // Component, // } from 'react'; // // import { // AppRegistry, // Text, // TouchableHighlight, // } from 'react-native'; // // class SampleApp extends Component { // onPress() { Alert.alert('Hello, World!', 'Press ok to alert again', [ { text: 'Ok', onPress() { alert('Ok!') } }, { text: 'Cancel', onPress() { alert('Cancel') } }, ]); // } // render() { // return ( // // // Button // // ; // ); // } // } // // AppRegistry.registerComponent('SampleApp', () => SampleApp); @tadeuzagallo #reactamsterdam