フロントエンドエンジニアが React Native を触ってみた話

by Kamakura Masaya

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ϑϩϯτΤϯυΤϯδχΞ͕ React Native Λ৮ͬͯΈͨ࿩ RECRUIT Technologies NIGHT vol.5 ח૔ ਖ਼໵ʢϦΫϧʔτςΫϊϩδʔζɹITιϦϡʔγϣϯ౷ׅ෦ʣ

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ࣗݾ঺հ • ໊લɿח૔ ਖ਼໵ • ৬ۀɿϑϩϯτΤϯυΤϯδχΞ • React/Redux ͱ͔࢖ͬͯWebΞϓϦΛ࡞͍ͬͯΔ • React Native ͷௐࠪʢ2017/01ʙʣ

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ຊ೔ͷ಺༰ • React Native ʹ͍ͭͯ • ͳͥ React Native ͳͷ͔ • React Native ΞʔΩςΫνϟ • σϞΞϓϦ঺հ

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ຊ೔ͷ಺༰ • React Native ʹ͍ͭͯ • ͳͥ React Native ͳͷ͔ • React Native ΞʔΩςΫνϟ • σϞΞϓϦ঺հ

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React Native ͱ͸ • Facebook͕த৺ͱͳͬͯ։ൃΛ͍ͯ͠ΔωΠςΟϒΞϓϦ։ൃͷͨΊͷ ϑϨʔϜϫʔΫ • ಛ௃ • Webٕज़/஌ࣝ(HTML/CSS/JavaScript/React)Λ࢖ͬͯɺiOS/Android ͷΞϓϦΛ։ൃͰ͖Δ • Native UI (WebViewͰͳ͍) • ϋΠύϑΥʔϚϯε • ։ൃޮ཰͕ྑ͍(Live Reload, Hot Reloading)

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— Tom Occhino (Engineering Manager at Facebook) Learn Once, Write Anywhere ” “

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• Web ΞϓϦͰ React Λ࠾༻͢Δέʔε͕૿͍͑ͯΔ • React Λॻ͚Δਓࡐ͕૿͍͑ͯΔ • ਓһ֬อָ͕ʹͳΔ • React Native Λ࢖͏͜ͱʹΑͬͯ React(Web) Λ࢖͑ΔΤϯδχΞ ͷ࢓ࣄ෯Λ֦େͰ͖Δ

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React Native(Platforms) • iOS/Android/tvOS • built in

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React Native for Windows • react-native-windows • https://github.com/ReactWindows/react-native-windows

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React Native for MacOS • react-native-macos • https://github.com/ptmt/react-native-macos

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React Native for MacOS • react-native-touchbar • https://github.com/ptmt/react-native-touchbar

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Showcase https://facebook.github.io/react-native/showcase.html

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Instagram https://engineering.instagram.com/react-native-at-instagram-dd828a9a90c7

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Push Notification Settings https://engineering.instagram.com/react-native-at-instagram-dd828a9a90c7 • طଘΞϓϦ΁ͷ౷߹ • ·ͣ͸؆୯ͳը໘͔ΒऔΓֻ͔ͬͨ • ݩʑWebView • UI͕γϯϓϧ • φϏήʔγϣϯগͳ͍

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Edit Profile & Photos Of https://engineering.instagram.com/react-native-at-instagram-dd828a9a90c7 • ωΠςΟϒͰ࡞ͬͨը໘Λ React Native Խ • ύϑΥʔϚϯεΛଌఆ • τϨʔυΦϑ͕Ͳͷ͘Β͍͔

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Instagram(code sharing) https://engineering.instagram.com/react-native-at-instagram-dd828a9a90c7 • iOS/Android ؒͰڞ௨ԽͰ ͖ͨίʔυ

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WebView → React Native https://engineering.instagram.com/react-native-at-instagram-dd828a9a90c7 • WebView ͷ໰୊఺ • ىಈ͕஗͍ • UXʹωΠςΟϒײ͕ͳ͍ • React Native Խ͢Δ͜ͱʹΑΓ • ىಈ࣌ؒͱUXΛେ෯ʹվળ

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True Native → React Native https://engineering.instagram.com/react-native-at-instagram-dd828a9a90c7 • ίʔυͷڞ௨Խ • Live Reload, Hot Reloadingͷ ͓͔͛ͰίϯύΠϧɺΠϯετʔ ϧαΠΫϧ͕ૣ͘ͳΓ։ൃύ ϑΥʔϚϯε޲্ • ΑΓૣ͘ػೳΛϦϦʔεͰ͖Δ Α͏ʹͳͬͨ

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DEMO

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React(Web)/React Nativeͱͷҧ͍ ϙΠϯτ View ComponentɺϥΠϑελΠϧ౳ͷߟ͑ํ͸ಉ༷ ཁૉ͸ React Native ͷ Component ʹॻ͖׵͑ Style CSSͷ஌͕ࣝͦͷ··࢖͑Δ Flexbox ʹΑΔ Component ͷ഑ஔ Data Flow ﬂuxΞʔΩςΫνϟͷར༻͕Մೳ Navigation ʢը໘ભҠʣ react-routerϥΠΫͳϞδϡʔϧ͕͋Δ

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View • JSXʹΑΔ࣮૷ React React Native

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View render() { return ( My Counter App! {this.state.count} this.inc()} /> ); }

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Style const styles = StyleSheet.create({  container: {  flex: 1,  alignItems: 'center',  paddingTop: 65,  backgroundColor: '#F5FCFF',  },  title: {  fontSize: 25,  margin: 10,  },  value: {  color: '#333333',  marginBottom: 5,  fontSize: 40,  },  }); • CSS in JS • StyleSheet.createͰఆٛͨ͠ ελΠϧΛͦΕͧΕͷ ComponentʹదԠ͢Δ • Componentͷ഑ஔ͸Flexbox Ͱࢦఆ͢Δ

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Style render() { return ( My Counter App! {this.state.count} this.inc()} /> ); } const styles = StyleSheet.create({  container: {  flex: 1,  alignItems: 'center',  paddingTop: 65,  backgroundColor: '#F5FCFF',  },  title: {  fontSize: 25,  margin: 10,  },  value: {  color: '#333333',  marginBottom: 5,  fontSize: 40,  },  }); StyleSheet render()

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Style(Flexbox:flexDirection) const styles = StyleSheet.create({  container: {  flex: 1,  flexDirection: 'row', alignItems: 'center',  paddingTop: 65,  backgroundColor: '#F5FCFF',  },  title: {  fontSize: 25,  margin: 10,  },  value: {  color: '#333333',  marginBottom: 5,  fontSize: 40,  },  });

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Style(Flexbox:justifyContent) const styles = StyleSheet.create({  container: {  flex: 1,  alignItems: ‘center', justifyContent: ‘space-between’,  paddingTop: 65,  backgroundColor: '#F5FCFF',  },  title: {  fontSize: 25,  margin: 10,  },  value: {  color: '#333333',  marginBottom: 5,  fontSize: 40,  },  });

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Style(FAQ) • CSS Modules ͕࢖͍͍ͨʁ • ελΠϧఆٛΛผϑΝΠϧ(.css)ʹͯ͠importͯ͠ར༻͢Δํ๏ • React Native ͷελΠϧఆٛ͸ CSS ʹࣅͯΔ͚Ͳ΍ͬͺΓผ෺ • ίϯϙʔωϯτʹ෇༩Ͱ͖ͳ͍ϓϩύςΟ͕͋ΔͱܯࠂΛͩ͠ ͯ͘ΕΔ • ҰԠɺ࣮ݱͰ͖Δύοέʔδ͸͋Δ • https://github.com/sabeurthabti/react-native-css

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Style(FAQ)

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Style(FAQ) ར༻Մೳͳkey

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• ٙࣅཁૉ(:after/:before)͕࢖͍͍ͨʁ • ٙࣅཁૉ͸ఘΊͯɺී௨ʹཁૉΛॻ͔͘͠ͳ͍ • webfontΛ:beforeʹೖΕΔͱ͔webͩͱΑ͘΍Δ͚ͲͰ͖ͳ͍ Style(FAQ)

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• ٙࣅΫϥε͕࢖͍͍ͨʁ • JSଆͰ൑ఆͯ͠ελΠϧࢦఆ͢Δඞཁ͕͋Δ • React Native ൛ Radium Έ͍ͨͳͷ΋ଘࡏ͢Δ • https://github.com/vitalets/react-native-extended-stylesheet Style(FAQ) :ﬁrst-child i === 0 :last-child i === arr.length - 1 :nth-child(even) i % 2 :nth-child(odd) !(i%2)

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• shorthand͕࢖͍͍ͨʁ • ղܾ͠Α͏ͱ͍ͯ͠ΔϞδϡʔϧ͸͋Δ(margin, padding͔͠ରԠ͠ ͍ͯͳ͍͚Ͳɾɾɾ) • https://github.com/narendrashetty/react-native-styles-shorthand • ඪ४Ͱ΋͍͔ͭ͘ରԠ • marginHorizontal, marginVertical • paddingHorizontal, paddingVertical Style(FAQ)

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• CSS ʹ׳Ε͗͢Δͱ React Native ͷελΠϧఆٛ͸࠷ॳށ࿭͏͔΋ ͠Εͳ͍ • ֎෦ϞδϡʔϧͰղܾ͢Δબ୒ࢶ΋͋Δ͕ɺReact Native ͷόʔ δϣϯ্͕͕Δ͜ͱͰղܾ͞ΕΔ͜ͱ΋͋ΔͷͰɺ·ͣ͸ඪ४ͷ ΍ΓํͰ΍ͬͨ΄͏͕ྑ͍ Style

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iOS/Androidͷҧ͍ • Write Once, Run Anywhere? - No! • ϓϥοτϑΥʔϜ͝ͱʹUI/UXͷϕετϓϥΫςΟε͸ҧ͏ • φϏήʔγϣϯʢ໭ΔϘλϯʣ • ϋϯόʔΨʔϝχϡʔ / λϒϝχϡʔ

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iOS/Android • iOS/AndroidͰҟͳΔίʔυΛॻ͘ํ๏͸2ͭ͋Δ • Platform.OS, Platform.select • ϑΝΠϧࣗମΛ෼͚Δ • example.ios.js / example.android.js

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Platform.OS, Platform.select if (Platform.OS === ‘android’) { // Android ͷΈ࣮ߦ͢Δίʔυ } else if (Platform.OS === ‘ios’) { // iOS ͷΈ࣮ߦ͢Δίʔυ } // files ComponentIOS.js ComponentAndroid.js // component const Component = Platform.select({ ios: () => require('ComponentIOS'), android: () => require('ComponentAndroid'), })(); ;

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ϑΝΠϧࣗମΛ෼͚Δ // Files example.ios.js example.android.js // Usage import example from './example'; // Ϗϧυ࣌ʹ൑ఆ͞ΕΔ $ react-native run-ios $ react-native run-android

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ຊ೔ͷ಺༰ • React Native ʹ͍ͭͯ • ͳͥ React Native ͳͷ͔ • React Native ΞʔΩςΫνϟ • σϞΞϓϦ঺հ

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ͳͥ React Native ͳͷ͔ • Webٕज़Λ࢖ͬͯϞόΠϧΞϓϦ։ൃΛՄೳʹ͢ΔϑϨʔϜϫʔΫ͸ ͍͔ͭ͋͘Δ • React Native • NativeScript • Ionic • PhoneGap/Cordova Native UI WebView

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ͳͥ React Native ͳͷ͔ • Ϣʔβʔ਺ͷଟ͍ΞϓϦͰ࠾༻͞Ε͍ͯΔʢFB, Instagram, Airbnbʣ • (R-Tech)FEඪ४Ͱ͋Δ React/Redux ͷαʔϏεͰ͋Ε͹ɺWeb൛Ͱ ։ൃͨ͠ίʔυͷڞ༗Խ͕Մೳ • FEඪ४Ͱ։ൃͰ͖ΔΤϯδχΞ૿Ճத

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ͳͥ React Native ͳͷ͔ • Web ΞϓϦΛ࡞ͬͨޙʹεϚϗΞϓϦ൛΋ཉ͍͠ͱ͍͏ཁ๬΋͋Δ • WebView ϕʔεͷαʔϏε͕ଟ͍ͷͰ React Native ԽʹΑΔύ ϑΥʔϚϯε޲্͕ૂ͑Δ • ୺຤ੑೳ΋ྑ͘ͳ͍ͬͯͷͰɺ౤ࢿޮՌ͸ΞϓϦಛੑʹґଘ͢Δ

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ຊ೔ͷ಺༰ • React Native ʹ͍ͭͯ • ͳͥ React Native ͳͷ͔ • React Native ΞʔΩςΫνϟ • σϞΞϓϦ঺հ

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React Native ΞʔΩςΫνϟ Android/iOS Native JavaScriptCore (JSC) Bridge App

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Android/iOS Native JavaScriptCore (JSC) Bridge(IPC) JS Runtime (Production) App

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Android/iOS Native V8(Chrome) Bridge(WebSocket) JS Runtime (Debug Mode) App

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JS Runtime (Debug Mode) Tap!

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Chrome Dev ToolsʢWebSocketʣ

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Chrome Dev ToolsʢBreak Pointsʣ

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Data Flow touch update

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Data Flow Touch Event Main Thread Native Modules MessageQueue JS Thread UITouch

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Data Flow Touch Event Handle Event Main Thread Native Modules MessageQueue JS Thread UITouch [ ‘EventEmitter’, ‘receiveTouches’, [‘topTouchStart’, {‘target’: 12, ’x’: 42, ‘y’: 106}] ]

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Data Flow Touch Event Handle Event Main Thread Native Modules MessageQueue JS Thread UITouch setState(), render()

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Data Flow Touch Event Handle Event Main Thread Native Modules MessageQueue JS Thread UITouch UIManager.u pdate…. setState(), render() [ ‘UIManager’, ‘update’, [viewID, attributes] ]

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Data Flow Touch Event Handle Event Main Thread Native Modules MessageQueue JS Thread UITouch UIManager.u pdate…. setState(), render() [ ‘UIManager’, ‘update’, [viewID, attributes] ]

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Data Flow Touch Event Handle Event Main Thread Native Modules MessageQueue JS Thread UITouch UIManager.u pdate…. setState(), render() [ ‘UIManager’, ‘update’, [8, {‘text’: ‘6’}] ]

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Data Flow Touch Event Handle Event Main Thread Native Modules Event Queue JS Thread UITouch UIManager.u pdate…. setState(), render() Update UI dispatch_async()

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Data Flow Touch Event Handle Event Main Thread Native Modules Event Queue JS Thread UITouch UIManager.u pdate…. setState(), render() Update UI [UIManager updateView: @8, props:@{@“text”: @“6”}]

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ຊ೔ͷ಺༰ • React Native ʹ͍ͭͯ • ͳͥ React Native ͳͷ͔ • React Native ΞʔΩςΫνϟ • σϞΞϓϦ঺հ

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σϞΞϓϦ • Web(React) Ͱ࡞ͬͨαʔϏεΛ React Native Ͱ࣮૷த Web React Native

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• ײ૝ • Web ͷ React Λ࢖ͬͨ͜ͱ͕͋Ε͹͙͢ʹॻ͚Δ/Θ͔Δ • Web ʹ͍ۙײ֮Ͱͷ։ൃ • npm • Cmd-RͰϦϩʔυɺLive Reload, Hot Reloading DEMOΞϓϦ

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• ײ૝ଓ͖ • ը໘͸100%࡞Γ௚͠ • Web Ͱ࡞ͬͨίϯϙʔωϯτΛࢀߟʹͰ͖Δ • Web ൛Λ Flexbox Ͱ࡞͍ͬͯͳ͍ͱߟ͑Δ͜ͱ͕૿͑Δ • ڞ௨ԽͰ͖Δίʔυ͕ଟ͍ • Redux(Actions, Reducers)ɺBFF ͱͷ௨৴෦෼ • mono-repo Ͱߏ੒Λߟ͑Δͷ΋͋Γ DEMOΞϓϦ

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• ײ૝ଓ͖ • Objective-C(Swift),Java ͷ஌͕ࣝඞཁʹͳΔͱ͜Ζ͸͍·ͷͱ͜ Ζͳ͍ • React Native ͕ఏڙ͍ͯ͠ͳ͍APIΛ࢖͍͍ͨͱ͔ɺ Cocoapods Ͱಋೖͨ͠ϥΠϒϥϦͱ Bridge ͍ͨ͠ͱ͔ͳ͚Ε ͹ɾɾɾ • ࠔͬͨͱ͖ͷͨΊʹνʔϜʹ1ਓ͸ Native ʹৄ͍͠ਓ͸ཉ͍͠ DEMOΞϓϦ

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͝ਗ਼ௌ͋Γ͕ͱ͏ ͍͟͝·ͨ͠ɻ