いまさら聞けないRxSwift入門

by M.Inomata

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͍·͞Βฉ͚ͳ͍ RxSwiftೖ໳ גࣜձࣾ tech vein ழມ ॆԝ

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ࣗݾ঺հ גࣜձࣾ tech vein ୅ද ழມ ॆԝ (͍ͷ·ͨ ΈͭͻΖ) ձࣾHP: https://www.tech-vein.com/ private twitter: @ino2222

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ެ։தͷAndroid/iOSΞϓϦ ι΢ϧΞϯϦʔγϡ ࣗ෼ͷΦϦΩϟϥΛ࡞ΔεϚϗ31( IUUQTPVOUFDIWFJODPN IUUQTCJUMZ);BV3 $IJJ2 ஍ҬͰॿ͚߹͑Δಗ໊૬ஊΞϓϦ IUUQTBQQMFDP,[IYD ϙέοτΞϒετϥΫτ ҩྍैࣄऀ޲͚ͷ࠷৽δϟʔφϧӾཡΞϓϦ

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ࠓ೔͓࿩͢Δ͜ͱ • RxSwiftͱ͸ • RxSwiftͷجຊ • ͜Ε͚֮ͩ͑ͨΒ࢖͑ΔΑ͏ʹͳΔ͔΋ʁ

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ࠓ೔͓࿩͠ͳ͍͜ͱ(஌ͬͯΔਓ޲͚) • Cold -> Hot ม׵ • Reactive Streams(backPressure ͳͲ)

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RxSwiftͱ͸ • ֤ݴޠͰ࣮૷͞Ε͍ͯΔʮRx(Reactive Extension)ʯ  ͷSwift޲͚ϥΠϒϥϦ • Reactive Extension … ΋ͱ΋ͱ͸  C#.NET Ͱ࢖ΘΕͩͨ͠ Rx.NET ͕ΦϦδφϧ • Java(RxJava), JavaScript(RxJS), C++(RxCpp), Ruby(Rx.rb), PHP(RxPHP) ͳͲͳͲଟ਺

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ReactiveXͱ͸Կ͔ʁ ReactiveX = Reactive Extension Reactive Programming ʹ൓ԠతϓϩάϥϛϯάΛ͢Δͨ Ίͷ Extension = ֦ு ReactiveX͸ - σβΠϯύλʔϯͷ Observable ύλʔϯ - σβΠϯύλʔϯͷ Iterator ύλʔϯ - ؔ਺ܕϓϩάϥϛϯά Λ૊Έ߹Θͤͯ࡞ΒΕͨϥΠϒϥϦͷ͜ͱ

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Observerύλʔϯ σʔλΛ؂ࢹ͢Δਓͱ఻͑Δ࢓૊ΈΛ ந৅Խͨ͠σβΠϯύλʔϯ ͕͜͜େࣄʂ

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Iterator ύλʔϯ https://ja.wikipedia.org/wiki/Iterator_ύλʔϯ Ұ࿈ͷσʔλΛॱ൪ʹॲཧ͢ΔσβΠϯύλʔϯ ͕͜͜େࣄʂ

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ؔ਺ܕϓϩάϥϛϯά ˠ ͦΕͧΕͷؔ਺͸ */065ʹ͔͠ Өڹ͠ͳ͍ ʹ෭࡞༻͕ͳ͍

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ͦͯ͠Rx΁…

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͕͜͜خ͍͠RxSwift ࣌ܥྻσʔλΛؚΉɺ͋ΒΏΔσʔλΛετϦʔϜͱͯ͠εϚʔτʹॲཧͰ͖Δɻ ετϦʔϜͱͯ͠ॱ൪ʹॲཧͰ͖Δ͜ͱͰɺ΍΍͍͜͠ඇಉظ੍ޚ͕γϯϓϧʹͳΔɻ →ίʔϧόοΫ஍ࠈ͔Βͷղ์ ந৅ԽʹΑΓૹΓखɾड͚औΓखΛ௚઀஌Βͳ͍··ॲཧ͕ग़དྷΔͷͰૄ݁߹ʹͳΔɻ →վมͷӨڹൣғ͕খ͘͞ͳΔ →෦඼Խɾڞ௨Խ͕ਐΉ ֤छετϦʔϜΛѻ͏ศརͳಓ۩͕ἧ͍ͬͯΔɻ →ετϦʔϜͷੜ੒ɾม׵ɾ߹੒Λߦ͏ΦϖϨʔλ܈ →ετϦʔϜͷεϨου੾Γସ͑ػೳ

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RxSwiftͷجຊ

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RxSwiftͷجຊ ͜Ε͚ͩ஌ͬͯͨΒ RxŧŔŕŪɹɹ ũƄŝſͬͯݴ͑Δ

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RxSwiftͷجຊ ͜Ε͚ͩ஌ͬͯͨΒ RxŧŔŕŪ(ŦƄş)ũƄŝſͬͯݴ͑Δ͔΋ʁ

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Observable, Subject, Disposable ΩϞʹͳΔͷ͸ɺ ͜ͷ̏ܥ౷ͷΫϥε(ϓϩτίϧ)ɻ Ϋϥε͸৭ʑ͋Γ·͕͢ɺ ͍͍ͩͨ͜ΕΒͷ஥ؒͰ͢ɻ

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+ subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷ໭Γ஋ Observable, Subject, Disposable

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Observable ௚༁͢Δͱɺ؂ࢹ͢Δ͜ͱ͕Ͱ͖Δର৅ɻ ೚ҙͷܕ T ʹ͍ͭͯɺ؂ࢹͯ͠σʔλʢΠϕϯτ)Λड͚औ Δࣄ͕Ͱ͖ΔΫϥεɾΠϯελϯεͰ͢ɻ ࣌ܥྻͰσʔλ͕ObservableʹྲྀΕΔ͜ͱ͔Βɺ Observable͸ετϦʔϜ(Stream)ͱ΋ݺͼ·͢ɻ + subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷ໭Γ஋

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“Hello” “Rx” “World” Observable completed ࣌ؒͷྲྀΕ ࣮ߦ݁ՌɿԼͷॱʹग़ྗ͞ΕΔɻ OFYU )FMMP OFYU 3Y OFYU 8PSME DPNQMFUFE

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Subject ؆୯ʹݴ͏ͱɺ೚ҙͷσʔλΛྲྀ͢ػೳ(Observer ͱͯ͠ͷػೳ)Λ࣋ͬͨObservable࣮૷ɻ RxSwift ͷSubject͸ PublishSubject, BehaviorSubject, ReplaySubject ͷ̏छྨɻ + subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷ໭Γ஋

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Subject͸ObserverΛܧঝ͍ͯ͠ΔͷͰ Observableͱͯ͠ѻ͑Δɻ Subject͸onNext(), onComplete(), onError() ͳͲͷσʔλɾΠϕϯτൃ৴ϝιουΛ࣋ͭɻ

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ετϦʔϜͷΠϕϯτ • next  σʔλ͕ਖ਼͘͠ྲྀΕ͖ͯͨͱ͍͏Πϕϯτɻ೚ҙͷܕͷσʔλΛҾ਺ʹ࣋ ͭɻ • error  ετϦʔϜத͕Τϥʔ(ྫ֎)Ͱҟৗఀࢭͨ࣌͠ʹྲྀΕΔΠϕϯτɻൃੜͨ͠ ΤϥʔΛҾ਺ʹ࣋ͭɻ • completed  ετϦʔϜ͕ਖ਼͘͠׬ྃͨ࣌͠ʹൃੜ͢ΔΠϕϯτɻετϦʔϜͷ࠷ޙʹ Ұ౓͚ͩൃੜ͢Δɻ  ʢೖྗΛ଴ͪଓ͚͍ͨͱ͖͸completedΛྲྀ͞ͳ͍ʣ

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ετϦʔϜͷΠϕϯτ next completed next next next next next completed next next ετϦʔϜ͸ next ͰσʔλΛྲྀ͠ɺDPNQMFUFEͰऴྃ͢Δ DPNQMFUFE͕དྷͨΒɺͦͷઌ͸OFYUFSSPS͸ྲྀͤͳ͍ next next next FSSPS ྫ֎ ͕དྷͨΒɺͦͷઌ͸OFYUDPNQMFUFEFSSPS͸ྲྀͤͳ͍ error

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RxSwift ͷ Subject࢖͍෼͚ ɾPublishSubject ɹաڈͷσʔλΛอ࣋͠ͳ͍Subjectɻ ɹར༻ྫɿϘλϯͷλοϓΠϕϯτ ɾBehaviorSubject ɹաڈͷσʔλͷ͏ͪ௚ۙͷ̍ͭΛอ͍࣋ͯ͠ΔSubjectɻ ɹར༻ྫɿεΠονON/OFFঢ়ଶɾϢʔβεςʔλεͳͲ ɾReplaySubject.create(bufferSize: Int) ɹաڈͷ௚ۙσʔλΛࢦఆόοϑΝʹೖΔ͚ͩอ͍࣋ͯ͠ΔSubjectɻ ɹόοϑΝαΠζ̌ͳΒPublishSubjectͱಉ͡ɻ ɹόοϑΝαΠζ̍ͳΒBehaviorSubjectͱಉ͡ɻ ɹར༻ྫɿࢥ͍͔ͭͳ͍…ཤྺܥͰ࢖͑Δ͔΋ʁ

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PublishSubject PublishSubject completed ࣌ؒͷྲྀΕ TVCTDSJCF TVCTDSJCF

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BehaviorSubject BehaviorSubject completed ࣌ؒͷྲྀΕ TVCTDSJCF TVCTDSJCF TVCTDSJCF

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ReplaySubject ReplaySubject.create(buﬀerSize: 2) completed ࣌ؒͷྲྀΕ TVCTDSJCF TVCTDSJCF TVCTDSJCF

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Disposable ௚༁͢Δͱɺഇغɾॲ෼Ͱ͖Δ΋ͷɻ ObservableΛ subscribe(ߪಡ) ͢Δͱ໭Γ஋ͱͯ͠ Disposable Λ ฦ͠·͢ɻ Disposableʹରͯ͠dispose()ΛݺͿ͜ͱͰɺඇಉظॲཧͷΩϟϯη ϧͳͲɺ؂ࢹ͢Δଆͱͯ͠ॲཧΛࢭΊΔࣄ͕Ͱ͖·͢ɻ ྫɿը໘Λดͨ͡Β௨৴Ωϟϯηϧͨ͠Γɺೖྗ଴ͪΛࢭΊͨΓ͢ Δɻ + subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷ໭Γ஋

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+ subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷ໭Γ஋ ॲཧͷྲྀΕ

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+ subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷ໭Γ஋ subscribe(onNext: … ) ॲཧͷྲྀΕ

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+ subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷ໭Γ஋ subscribe(onNext: … ) ΠϕϯτΛҾ਺ͷΫϩʔδϟͰ଴ͪड͚Δ PO/FYU lIFMMPz PO/FYU l3Yz PO/FYU l8PSMEz ʜ PO$PNQMFUFE ॲཧͷྲྀΕ

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+ subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷ໭Γ஋ subscribe(onNext: … ) dispose() ΠϕϯτΛҾ਺ͷΫϩʔδϟͰ଴ͪड͚Δ ॲཧͷྲྀΕ

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(x, y) (x2, y2) (x3, y3) ྫɿλονΠϕϯτͷ؂ࢹ Observable) ࣌ؒͷྲྀΕ (x4, y4) TVCTDSJCF EJTQPTF EJTQPTFE (x2, y2) (x3, y3) Disposable.dispose()

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DisposeBag disposeΛ͍͍ͪͪ͢Δͷ͸ΊΜͲ͍͘͞ɻ ͦΜͳͱ͖͸DisposeBagɻ

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DisposeBag ը໘ͳͲɺ؂ࢹݩΠϯελϯε͕ࢮΜͩΒࣗಈͰͥΜ Ϳdisposeͯ͠΄͍࣌͠ʹ࢖͑ΔศརΫϥεɻ DisposeBagΠϯελϯεʹಥͬࠐΜͰ͓͘ͱɺ disposeBag͕ղ์͞ΕΔ࣌ʹ·ͱΊͯdisposeBagͷ தͷdisposableΛdisposeͯ͘͠ΕΔɻ ˠ3Yඪ४Ͱ͸ͳ͍Ͱ͕͢ΊͪΌͪ͘Ό࢖͍·͢ɻ ɹͱΓ͋͑ͣ%JTQPTF#BH࡞ͬͯ์ΓࠐΜͰ͓͚͹͍͍ͱࢥ͏ɻ

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(x, y) (x2, y2) (x3, y3) ྫɿλονΠϕϯτͷ؂ࢹ Observable) ࣌ؒͷྲྀΕ (x4, y4) TVCTDSJCF EJTQPTF EJTQPTFE (x2, y2) (x3, y3) EJTQPTFE CZEJTQPTF#BH Subscibe ॲཧ DisposeBag JOJU EFJOJU View %JTQPTBCMFΛ %JTQPTF#BHͷ தʹೖΕΔɻ %JTQPTF#BH͸ ഁغ͞ΕΔͱ தͷ%JTQPTBCMFΛ EJTQPTF͢Δɻ

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IUUQTHJUIVCDPNFDPPQOFUSYTXJGUCFHJOOFSCMPCNBTUFS3Y4XJGU4BNQMF3Y4XJGU4BNQMF 6*4BNQMF7JFX$POUSPMMFSTXJGU DisposeBagͷར༻ྫ ˡ6*7JFX$POUSPMMFSͷ ϑΟʔϧυʹEJTQPTF#BHΛஔ͍͓ͯ͘  ˠը໘͕ดͨ͡Β6*7JFX$POUSPMMFS͕ࢮ͵ɻ ˠ6*7JFX$POUSPMMFS͕ࢮΜͩΒ%JTQPTF#BH΋ࢮ͵ɻ ˠ%JTQPTF#BH͕ࢮΜͩΒඥͮ͘EJTQPTBCMF͕ ɹEJTQPTF ͞ΕΔɻ

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ΦϖϨʔλ(Operator) Rxʹ͸ Observable, SubjectͰ࡞ͬͨετϦʔϜΛૢ ࡞͢Δػೳ͕ఏڙ͞Ε͍ͯ·͢ɻ ετϦʔϜ(=Observable)Λม׵ɾ߹੒ɾੜ੒͢Δૢ ࡞ͷ͜ͱΛʮΦϖϨʔλʯͱݺͼ·͢ɻ

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ετϦʔϜΛ࡞Δ ̍ … Subject Ϋϥε͔Β࡞Δ ̎ … from(), of(), just() ͳͲͰ೚ҙͷ഑ྻɾ஋Λ ม׵ͯ͠࡞Δ ̏ … Observable.create() Ͱ೚ҙͷॲཧ͔Β࡞Δ

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PublishSubject completed ࣌ؒͷྲྀΕ TVCTDSJCF TVCTDSJCF

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10 Observable.just(10) completed σʔλετϦʔϜͷྲྀΕ just( ) ετϦʔϜม׵

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“a” Observable.of(“a”, ”b”, ’c”, ”d”, “e”) completed σʔλετϦʔϜͷྲྀΕ of( , , , , ) ετϦʔϜม׵ “b” “c” “d” “e”

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1 Observable.from([1, 3, 5, 7, 9]) completed σʔλετϦʔϜͷྲྀΕ from([ , , , , ]) ετϦʔϜม׵ 3 5 7 9

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Observable.error(MyError()) σʔλετϦʔϜͷྲྀΕ error( ) ετϦʔϜม׵ myError

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1 Observable.create(೚ҙͷॲཧ) completed σʔλετϦʔϜͷྲྀΕ create(೚ҙͷॲཧ) ετϦʔϜม׵ 3 5 7 9

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map: ετϦʔϜΛม׵͢Δ map(_:((T) -> R)) -> Observable ೚ҙͷܕɾ஋ͷετϦʔϜΛՃ޻ͯ͠ผͷܕɾ஋ͷετϦʔ Ϝʹม׵͠·͢ɻ

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ﬁlter: ετϦʔϜΛϑΟϧλ͢Δ ﬁlter(_:((T) -> Bool)) -> Observable ྲྀΕ͖ͯͨετϦʔϜΛҾ਺ͷؔ਺Ͱॱ൪ʹॲཧ͠ɺ ݁Ռ͕true ʹͳΔσʔλ͚ͩͷετϦʔϜʹม׵͠·͢ɻ

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ﬂatMap: ετϦʔϜΛม׵͢ Δ ﬂatMap(_:((T) -> Observable)) -> Observable ೚ҙͷܕɾ஋ͷετϦʔϜΛՃ޻ͯ͠ผͷܕɾ஋ͷετϦʔ Ϝʹม׵͠·͢ɻmapͱ΄΅ಉ͡Ͱ͕͢ɺΫϩʔδϟͷฦΓ ஋͕Observableʹͳ͍ͬͯΔ఺͕ҟͳΓ·͢ɻ

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1 completed 2 3 ﬂatMap({x in Observable.of(x, x*10)}) 1 completed 2 3 10 20 30 completed completed completed 1 completed 2 3 10 20 30

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ﬁlter, map, ﬂatMap ͷྫ

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map ͱ flatMap ͷ࢖͍෼͚ map … ಉظతʹॲཧͰ͖Δσʔλม׵ʹ࢖͍·͢ɻ ྫɿStringܕ -> URLܕɺInt ܕΛॱ൪ʹܭࢉͯ͠ม׵͢Δ flatMap … ඇಉظॲཧͳͲɺผͷετϦʔϜΛ࢖ͬͯม׵͢Δ ࣌ʹ࢖͍·͢ɻ ྫɿtwitterͷπΠʔτIDετϦʔϜΛflatMapͯ͠ɺॱ൪ʹAPI Λୟ͍ͯ಺༰Λऔಘͯ͠λΠϜϥΠϯදࣔ͢Δ

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map ͱ subscribe ͷ࢖͍෼͚ ʢ؆୯ͳઆ໌ʣ ͲͪΒͰ΋onNext ʹ͍ͭͯॲཧ͕ग़དྷ·͕͢ɺ subscribe()͸ܨ͍ͩετϦʔϜΛಈ͔࢝͠ΊΔͱ͍͏େࣄͳ໾ׂ͕͋Γ·͢ɻ (ετϦʔϜม׵ͷऴ୺) subscribe() ͸ετϦʔϜม׵Ͱͳ͘ετϦʔϜ࣮ߦʹͳΔͨΊɺObservable Ͱͳ͘DisposableΛฦ͠·͢ɻ͜ͷͨΊmapͱҧ͍͏͠ΖʹετϦʔϜΛͭͳ ͛Δ͜ͱ͕Ͱ͖·ͤΜɻ

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1 completed σʔλετϦʔϜͷྲྀΕ Observable.from([1, 2, 3, 4, 5]) ετϦʔϜม׵ 2 3 4 5 ﬁlter({ x in x % 2 == 1}) 1 completed 3 5 map({ x in “v\(x)”) “v1” completed “v3” “v5” TVCTDSJCF “v1” completed “v3” “v5”

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ଞʹ΋ ศརͳΦϖϨʔλ͕ ͨ͘͞Μ͋Γ·͢ ࢀߟɿ http://reactivex.io/documentation/operators.html http://rxmarbles.com/

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ศརͳΦϖϨʔλͷҰྫ • zip, merge, combineLatest …   ෳ਺ͷετϦʔϜΛฒྻʹಈ͔ͯ̍ͭ͠ͷετϦʔϜʹ·ͱΊΔɻ • catchError …  Τϥʔ͕ൃੜͨ͠ͱ͖ʹϦΧόϦॲཧΛͯ͠onNext ʹม׵͢Δɻ࠶౓ΤϥʔΛ౤͛Δ(throw)͜ͱͰɺผͷΤ ϥʔʹม׵͢Δ͜ͱ΋Ͱ͖Δ • distinctUntilChanged …  ॏෳআ֎ɻετϦʔϜதʹมߋ͕͋ͬͨͱ͖͚ͩ௨஌͢Δ • throttle, debounce …  ࿈ଧ๷ࢭʹ࢖͑ΔϑΟϧλɻσʔλΛड͚औͬͨΒҰఆ࣌ؒؒΛ։͚ͳ͍ͱ͕࣍ൃՐ͠ͳͨ͘͠Γ͢Δ • toArray …   ഑ྻʹ·ͱΊΔɻcompleted·Ͱ଴ͬͯ̍ͭͷ഑ྻʹม׵͢Δ • groupBy …  ετϦʔϜͷσʔλΛ޷͖ͳ৚݅ͰάϧʔϓԽ͢Δ

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Try Rx!

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RxSwift/RxCocoa ͷ Πϯετʔϧ ᶃ CocoaPods → Podﬁle: ᶄ pod install ᶅ .swift ϑΝΠϧͰimport ※Carthage / Swift Package Manager ʹ΋ରԠͯ͠·͢ɻ https://github.com/ReactiveX/RxSwift 3Y$PDPBʹ͍ͭͯ͸ޙड़ ·ͨ͸

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Hello, Rx world ˠ

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Hello, Rx world2 ˠ

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Hello, Rx world3 ˣ

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RxCocoa ʹ͍ͭͯ RxSwift ͷαϒηοτతͳϥΠϒϥϦͰ͢ɻ RxSwift ͕७ਮͳ Rx ࣮૷ͰɺRxCocoa ͸ iOS/Mac։ൃʹศརͳ෇ଐΫϥεɾ֦ு Λఏڙ͍ͯ͠·͢ɻ RxCocoa Λ࢖͏ʹ͸ RxSwift ͱ͸ผʹϥΠϒϥϦΠϯετʔϧ͕ඞཁʹͳΓ·͢ɻ > pod ‘RxCocoa' Ͱ pod install ͯ͠ɺswiftίʔυ಺Ͱ import RxCocoa Λॻ͍͓ͯ͘ͱ࢖͑·͢ɻ

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RxCocoa ͕ఏڙ͢Δػೳͷྫ

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UIKit ఏڙΫϥεͷ rx Խ UIView, URLSession ͳͲUIKit,͕ఏڙ͢ΔΫϥεͷϓϩύςΟɾΠϕϯτ ΛrxԽͯ͠ɺObservableΠϯελϯεͱͷ૬ޓόΠϯυΛՄೳʹ͢Δɻ ྫɿ - ਺ࣈΛςΩετೖྗͨ͠Βϥϕϧʹܭࢉ݁ՌΛදࣔ͢Δɻ - ϘλϯΛԡͨ͠ΒAPI௨৴ͯ͠ɺAPI࣮ߦ݁ՌΛϥϕϧʹදࣔ͢Δɻ - URLSession ͷAPI௨৴݁ՌJSONΛ੔ܗͯ͠ϓϩϑΟʔϧը໘ʹදࣔ

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஌͓ͬͯ͘ͱྑ͍͔΋ɻ • RxAlamoﬁre ͳͲ୳ͤ͹ઌਓ͕RxԽͯ͘͠ ΕͯΔ΋ͷɺެ։͞ΕͯΔίʔυ͕݁ߏ͋ Γ·͢ɻ

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·ͱΊ

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·ͱΊ • σʔλͷ΍ΓऔΓΛετϦʔϜͱͯ͠ߟ͑Α͏ • ͱΓ͋͑ͣRxͷετϦʔϜ(Observable)ʹͰ͖ͨ Βͬͪ͜ͷ΋ͷɻͲ͏Ճ޻ͯ͠໨తͷܗࣜʹ͢Δ ͔Λߟ͑Α͏ɻ • RxΛۃΊͨΒϩδοΫ͕γϯϓϧʹ෭࡞༻ͳ͘ɺ εϚʔτʹॻ͚ΔΑ͏ʹͳΔɻඇಉظॲཧ΋ා͘ ͳ͍ʢ͸ͣʣ

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͍͞͝ʹ • tech vein Ͱ͸͜ΜͳΞϓϦΤϯδχΞɺ  ϑϦʔϥϯεɾύʔτφʔ༷Λืू͍ͯ͠·͢ɻ • RxSwift, RxJava Λ࢖͍͍ͨ • MVVMɺ CleanArchitectureɺ DI Λ׆༻ͨ͠ઃܭʹڵຯ͕͋Δ ڵຯ͕͋Δํɺͪΐͬͱ࿩Λฉ͍ͯΈ͍ͨํ  ͨͩ3Yͷ࿩Λ΋ͬͱฉ͖͍ͨํ΋  ͥͻ͓੠͕͚Լ͍͞ʂ

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ࢀߟ • ࠓճͷαϯϓϧίʔυஔ͖৔ɹʴ RxCocoa Λ࢖ͬͨ؆୯ͳΞϓ Ϧ • GitHub:  https://github.com/ecoopnet/rxswift-beginner • ࢀߟهࣄ • Կͱͳ͘RxJavaΛ࢖ͬͯΔ͚Ͳਖ਼௚Α͘෼͔ͬͯͳ͍ਓ͕ಡ Ήͱྑͦ͞͏ͳهࣄɾجૅฤ  https://qiita.com/k-mats/items/4d374460a3f6284dd09f

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͕࣌ؒ͋Ε͹αϯϓϧΞϓϦσϞ

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͝ਗ਼ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠

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Driver ͷ࢖͍ํ͸ Observable ͱ΄΅ಉ͡

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Driver ͷ࢖͍ํ͸ Observable ͱ΄΅ಉ͡ʁ →Τϥʔॲཧ͕ཁΒͳ͍౳ͷࡉ͔͍ҧ͍͸͋Δ

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Driver (ิ଍) ۩ମతʹ͸ observable.asDriver(onErrorJustReturn: “”) ͱ͢Δͱ - UIεϨουͰॲཧɿ .observeOn(MainScheduler.instance) - Cold -> Hot ม׵ɿ .share(replay:1) - Τϥʔ࣌ʹ؂ࢹ͕ࢭ·ΔͷΛ๷͙ͨΊͷϦΧόϦॲཧɿ .catchError({ _ in “” }) Λ·ͱΊͯ΍ͬͯ͘ΕΔΑ͏ʹͳΓ·͢ɻ ˎ