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いまさら聞けないRxSwift入門
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M.Inomata
May 10, 2018
Programming
15
3.6k
いまさら聞けないRxSwift入門
モバイルメソッド大阪第一回 RxSwift入門資料です。
M.Inomata
May 10, 2018
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Transcript
͍·͞Βฉ͚ͳ͍ RxSwiftೖ גࣜձࣾ tech vein ழມ ॆԝ
ࣗݾհ גࣜձࣾ tech vein ද ழມ ॆԝ (͍ͷ·ͨ ΈͭͻΖ) ձࣾHP:
https://www.tech-vein.com/ private twitter: @ino2222
ެ։தͷAndroid/iOSΞϓϦ ιϧΞϯϦʔγϡ ࣗͷΦϦΩϟϥΛ࡞ΔεϚϗ31( IUUQTPVOUFDIWFJODPN IUUQTCJUMZ);BV3 $IJJ2 ҬͰॿ͚߹͑Δಗ໊૬ஊΞϓϦ IUUQTBQQMFDP,[IYD ϙέοτΞϒετϥΫτ ҩྍैࣄऀ͚ͷ࠷৽δϟʔφϧӾཡΞϓϦ
ࠓ͓͢Δ͜ͱ • RxSwiftͱ • RxSwiftͷجຊ • ͜Ε͚֮ͩ͑ͨΒ͑ΔΑ͏ʹͳΔ͔ʁ
ࠓ͓͠ͳ͍͜ͱ(ͬͯΔਓ͚) • Cold -> Hot ม • Reactive Streams(backPressure ͳͲ)
RxSwiftͱ • ֤ݴޠͰ࣮͞Ε͍ͯΔʮRx(Reactive Extension)ʯ ͷSwift͚ϥΠϒϥϦ • Reactive Extension … ͱͱ
C#.NET ͰΘΕͩͨ͠ Rx.NET ͕ΦϦδφϧ • Java(RxJava), JavaScript(RxJS), C++(RxCpp), Ruby(Rx.rb), PHP(RxPHP) ͳͲͳͲଟ
ReactiveXͱԿ͔ʁ ReactiveX = Reactive Extension Reactive Programming ʹԠతϓϩάϥϛϯάΛ͢Δͨ Ίͷ Extension
= ֦ு ReactiveX - σβΠϯύλʔϯͷ Observable ύλʔϯ - σβΠϯύλʔϯͷ Iterator ύλʔϯ - ؔܕϓϩάϥϛϯά ΛΈ߹Θͤͯ࡞ΒΕͨϥΠϒϥϦͷ͜ͱ
Observerύλʔϯ σʔλΛࢹ͢Δਓͱ͑ΔΈΛ நԽͨ͠σβΠϯύλʔϯ ͕͜͜େࣄʂ
Iterator ύλʔϯ https://ja.wikipedia.org/wiki/Iterator_ύλʔϯ Ұ࿈ͷσʔλΛॱ൪ʹॲཧ͢ΔσβΠϯύλʔϯ ͕͜͜େࣄʂ
ؔܕϓϩάϥϛϯά ˠ ͦΕͧΕͷؔ */065ʹ͔͠ Өڹ͠ͳ͍ ʹ෭࡞༻͕ͳ͍
ͦͯ͠Rx…
͕͜͜خ͍͠RxSwift ࣌ܥྻσʔλΛؚΉɺ͋ΒΏΔσʔλΛετϦʔϜͱͯ͠εϚʔτʹॲཧͰ͖Δɻ ετϦʔϜͱͯ͠ॱ൪ʹॲཧͰ͖Δ͜ͱͰɺ͍͜͠ඇಉظ੍ޚ͕γϯϓϧʹͳΔɻ →ίʔϧόοΫࠈ͔Βͷղ์ நԽʹΑΓૹΓखɾड͚औΓखΛΒͳ͍··ॲཧ͕ग़དྷΔͷͰૄ݁߹ʹͳΔɻ →վมͷӨڹൣғ͕খ͘͞ͳΔ →෦Խɾڞ௨Խ͕ਐΉ ֤छετϦʔϜΛѻ͏ศརͳಓ۩͕ἧ͍ͬͯΔɻ →ετϦʔϜͷੜɾมɾ߹Λߦ͏ΦϖϨʔλ܈ →ετϦʔϜͷεϨουΓସ͑ػೳ
RxSwiftͷجຊ
RxSwiftͷجຊ ͜Ε͚ͩͬͯͨΒ RxŧŔŕŪɹɹ ũƄŝſͬͯݴ͑Δ
RxSwiftͷجຊ ͜Ε͚ͩͬͯͨΒ RxŧŔŕŪ(ŦƄş)ũƄŝſͬͯݴ͑Δ͔ʁ
Observable, Subject, Disposable ΩϞʹͳΔͷɺ ͜ͷ̏ܥ౷ͷΫϥε(ϓϩτίϧ)ɻ Ϋϥε৭ʑ͋Γ·͕͢ɺ ͍͍ͩͨ͜ΕΒͷؒͰ͢ɻ
+ subscribe() Observable + onNext() + onError() + onCompleted() +
subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ Observable, Subject, Disposable
Observable<T> ༁͢Δͱɺࢹ͢Δ͜ͱ͕Ͱ͖Δରɻ ҙͷܕ T ʹ͍ͭͯɺࢹͯ͠σʔλʢΠϕϯτ)Λड͚औ Δࣄ͕Ͱ͖ΔΫϥεɾΠϯελϯεͰ͢ɻ ࣌ܥྻͰσʔλ͕ObservableʹྲྀΕΔ͜ͱ͔Βɺ ObservableετϦʔϜ(Stream)ͱݺͼ·͢ɻ + subscribe()
Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ
“Hello” “Rx” “World” Observable<String> completed ࣌ؒͷྲྀΕ ࣮ߦ݁ՌɿԼͷॱʹग़ྗ͞ΕΔɻ OFYU )FMMP OFYU
3Y OFYU 8PSME DPNQMFUFE
Subject ؆୯ʹݴ͏ͱɺҙͷσʔλΛྲྀ͢ػೳ(Observer ͱͯ͠ͷػೳ)Λ࣋ͬͨObservable࣮ɻ RxSwift ͷSubject PublishSubject, BehaviorSubject, ReplaySubject ͷ̏छྨɻ +
subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ
SubjectObserverΛܧঝ͍ͯ͠ΔͷͰ Observableͱͯ͠ѻ͑Δɻ SubjectonNext(), onComplete(), onError() ͳͲͷσʔλɾΠϕϯτൃ৴ϝιουΛ࣋ͭɻ
ετϦʔϜͷΠϕϯτ • next σʔλ͕ਖ਼͘͠ྲྀΕ͖ͯͨͱ͍͏ΠϕϯτɻҙͷܕͷσʔλΛҾʹ࣋ ͭɻ • error ετϦʔϜத͕Τϥʔ(ྫ֎)Ͱҟৗఀࢭͨ࣌͠ʹྲྀΕΔΠϕϯτɻൃੜͨ͠ ΤϥʔΛҾʹ࣋ͭɻ •
completed ετϦʔϜ͕ਖ਼ྃͨ࣌͘͠͠ʹൃੜ͢ΔΠϕϯτɻετϦʔϜͷ࠷ޙʹ Ұ͚ͩൃੜ͢Δɻ ʢೖྗΛͪଓ͚͍ͨͱ͖completedΛྲྀ͞ͳ͍ʣ
ετϦʔϜͷΠϕϯτ next completed next next next next next completed next
next ετϦʔϜ next ͰσʔλΛྲྀ͠ɺDPNQMFUFEͰऴྃ͢Δ DPNQMFUFE͕དྷͨΒɺͦͷઌOFYUFSSPSྲྀͤͳ͍ next next next FSSPS ྫ֎ ͕དྷͨΒɺͦͷઌOFYUDPNQMFUFEFSSPSྲྀͤͳ͍ error
RxSwift ͷ Subject͍͚ ɾPublishSubject ɹաڈͷσʔλΛอ࣋͠ͳ͍Subjectɻ ɹར༻ྫɿϘλϯͷλοϓΠϕϯτ ɾBehaviorSubject ɹաڈͷσʔλͷ͏ͪۙͷ̍ͭΛอ͍࣋ͯ͠ΔSubjectɻ ɹར༻ྫɿεΠονON/OFFঢ়ଶɾϢʔβεςʔλεͳͲ ɾReplaySubject.create(bufferSize:
Int) ɹաڈͷۙσʔλΛࢦఆόοϑΝʹೖΔ͚ͩอ͍࣋ͯ͠ΔSubjectɻ ɹόοϑΝαΠζ̌ͳΒPublishSubjectͱಉ͡ɻ ɹόοϑΝαΠζ̍ͳΒBehaviorSubjectͱಉ͡ɻ ɹར༻ྫɿࢥ͍͔ͭͳ͍…ཤྺܥͰ͑Δ͔ʁ
PublishSubject PublishSubject<T> completed ࣌ؒͷྲྀΕ TVCTDSJCF TVCTDSJCF
BehaviorSubject BehaviorSubject<T> completed ࣌ؒͷྲྀΕ TVCTDSJCF TVCTDSJCF TVCTDSJCF
ReplaySubject ReplaySubject<T>.create(bufferSize: 2) completed ࣌ؒͷྲྀΕ TVCTDSJCF TVCTDSJCF TVCTDSJCF
Disposable ༁͢ΔͱɺഇغɾॲͰ͖Δͷɻ ObservableΛ subscribe(ߪಡ) ͢ΔͱΓͱͯ͠ Disposable Λ ฦ͠·͢ɻ Disposableʹରͯ͠dispose()ΛݺͿ͜ͱͰɺඇಉظॲཧͷΩϟϯη ϧͳͲɺࢹ͢Δଆͱͯ͠ॲཧΛࢭΊΔࣄ͕Ͱ͖·͢ɻ
ྫɿը໘Λดͨ͡Β௨৴Ωϟϯηϧͨ͠ΓɺೖྗͪΛࢭΊͨΓ͢ Δɻ + subscribe() Observable + onNext() + onError() + onCompleted() + subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ
+ subscribe() Observable + onNext() + onError() + onCompleted() +
subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ ॲཧͷྲྀΕ
+ subscribe() Observable + onNext() + onError() + onCompleted() +
subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ subscribe(onNext: … ) ॲཧͷྲྀΕ
+ subscribe() Observable + onNext() + onError() + onCompleted() +
subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ subscribe(onNext: … ) ΠϕϯτΛҾͷΫϩʔδϟͰͪड͚Δ PO/FYU lIFMMPz PO/FYU l3Yz PO/FYU l8PSMEz ʜ PO$PNQMFUFE ॲཧͷྲྀΕ
+ subscribe() Observable + onNext() + onError() + onCompleted() +
subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ subscribe(onNext: … ) dispose() ΠϕϯτΛҾͷΫϩʔδϟͰͪड͚Δ ॲཧͷྲྀΕ
+ subscribe() Observable + onNext() + onError() + onCompleted() +
subscribe() Subject ܧঝ + dispose() Disposable subscribe() ͷΓ subscribe(onNext: … ) dispose() ΠϕϯτΛҾͷΫϩʔδϟͰͪड͚Δ ॲཧΛࢭΊͨ͘ͳͬͨΒEJTQPTFΛݺͿ ॲཧͷྲྀΕ
(x, y) (x2, y2) (x3, y3) ྫɿλονΠϕϯτͷࢹ Observable<Point>) ࣌ؒͷྲྀΕ (x4,
y4) TVCTDSJCF EJTQPTF EJTQPTFE (x2, y2) (x3, y3) Disposable.dispose()
DisposeBag disposeΛ͍͍ͪͪ͢ΔͷΊΜͲ͍͘͞ɻ ͦΜͳͱ͖DisposeBagɻ
DisposeBag ը໘ͳͲɺࢹݩΠϯελϯε͕ࢮΜͩΒࣗಈͰͥΜ Ϳdisposeͯ͠΄͍࣌͠ʹ͑ΔศརΫϥεɻ DisposeBagΠϯελϯεʹಥͬࠐΜͰ͓͘ͱɺ disposeBag͕ղ์͞ΕΔ࣌ʹ·ͱΊͯdisposeBagͷ தͷdisposableΛdisposeͯ͘͠ΕΔɻ ˠ3Yඪ४Ͱͳ͍Ͱ͕͢ΊͪΌͪ͘Ό͍·͢ɻ ɹͱΓ͋͑ͣ%JTQPTF#BH࡞ͬͯ์ΓࠐΜͰ͓͚͍͍ͱࢥ͏ɻ
(x, y) (x2, y2) (x3, y3) ྫɿλονΠϕϯτͷࢹ Observable<Point>) ࣌ؒ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
IUUQTHJUIVCDPNFDPPQOFUSYTXJGUCFHJOOFSCMPCNBTUFS3Y4XJGU4BNQMF3Y4XJGU4BNQMF 6*4BNQMF7JFX$POUSPMMFSTXJGU DisposeBagͷར༻ྫ ˡ6*7JFX$POUSPMMFSͷ ϑΟʔϧυʹEJTQPTF#BHΛஔ͍͓ͯ͘ ˠը໘͕ดͨ͡Β6*7JFX$POUSPMMFS͕ࢮ͵ɻ ˠ6*7JFX$POUSPMMFS͕ࢮΜͩΒ%JTQPTF#BHࢮ͵ɻ ˠ%JTQPTF#BH͕ࢮΜͩΒඥͮ͘EJTQPTBCMF͕ ɹEJTQPTF ͞ΕΔɻ
ΦϖϨʔλ(Operator) Rxʹ Observable, SubjectͰ࡞ͬͨετϦʔϜΛૢ ࡞͢Δػೳ͕ఏڙ͞Ε͍ͯ·͢ɻ ετϦʔϜ(=Observable)Λมɾ߹ɾੜ͢Δૢ ࡞ͷ͜ͱΛʮΦϖϨʔλʯͱݺͼ·͢ɻ
ετϦʔϜΛ࡞Δ ̍ … Subject Ϋϥε͔Β࡞Δ ̎ … from(), of(), just()
ͳͲͰҙͷྻɾΛ มͯ͠࡞Δ ̏ … Observable.create() Ͱҙͷॲཧ͔Β࡞Δ
PublishSubject<T> completed ࣌ؒͷྲྀΕ TVCTDSJCF TVCTDSJCF
10 Observable.just(10) completed σʔλετϦʔϜͷྲྀΕ just( ) ετϦʔϜม
“a” Observable.of(“a”, ”b”, ’c”, ”d”, “e”) completed σʔλετϦʔϜͷྲྀΕ of( ,
, , , ) ετϦʔϜม “b” “c” “d” “e”
1 Observable.from([1, 3, 5, 7, 9]) completed σʔλετϦʔϜͷྲྀΕ from([ ,
, , , ]) ετϦʔϜม 3 5 7 9
Observable.error(MyError()) σʔλετϦʔϜͷྲྀΕ error( ) ετϦʔϜม myError
1 Observable.create(ҙͷॲཧ) completed σʔλετϦʔϜͷྲྀΕ create(ҙͷॲཧ) ετϦʔϜม 3 5 7 9
map: ετϦʔϜΛม͢Δ map(_:((T) -> R)) -> Observable<R> ҙͷܕɾͷετϦʔϜΛՃͯ͠ผͷܕɾͷετϦʔ Ϝʹม͠·͢ɻ
filter: ετϦʔϜΛϑΟϧλ͢Δ filter(_:((T) -> Bool)) -> Observable<T> ྲྀΕ͖ͯͨετϦʔϜΛҾͷؔͰॱ൪ʹॲཧ͠ɺ ݁Ռ͕true ʹͳΔσʔλ͚ͩͷετϦʔϜʹม͠·͢ɻ
flatMap: ετϦʔϜΛม͢ Δ flatMap(_:((T) -> Observable<R>)) -> Observable<R> ҙͷܕɾͷετϦʔϜΛՃͯ͠ผͷܕɾͷετϦʔ Ϝʹม͠·͢ɻmapͱ΄΅ಉ͡Ͱ͕͢ɺΫϩʔδϟͷฦΓ
͕Observableʹͳ͍ͬͯΔ͕ҟͳΓ·͢ɻ
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
filter, map, flatMap ͷྫ
map ͱ flatMap ͷ͍͚ map … ಉظతʹॲཧͰ͖Δσʔλมʹ͍·͢ɻ ྫɿStringܕ -> URLܕɺInt
ܕΛॱ൪ʹܭࢉͯ͠ม͢Δ flatMap … ඇಉظॲཧͳͲɺผͷετϦʔϜΛͬͯม͢Δ ࣌ʹ͍·͢ɻ ྫɿtwitterͷπΠʔτIDετϦʔϜΛflatMapͯ͠ɺॱ൪ʹAPI Λୟ͍ͯ༰Λऔಘͯ͠λΠϜϥΠϯදࣔ͢Δ
map ͱ subscribe ͷ͍͚ ʢ؆୯ͳઆ໌ʣ ͲͪΒͰonNext ʹ͍ͭͯॲཧ͕ग़དྷ·͕͢ɺ subscribe()ܨ͍ͩετϦʔϜΛಈ͔࢝͠ΊΔͱ͍͏େࣄͳׂ͕͋Γ·͢ɻ (ετϦʔϜมͷऴ) subscribe()
ετϦʔϜมͰͳ͘ετϦʔϜ࣮ߦʹͳΔͨΊɺObservable Ͱͳ͘DisposableΛฦ͠·͢ɻ͜ͷͨΊmapͱҧ͍͏͠ΖʹετϦʔϜΛͭͳ ͛Δ͜ͱ͕Ͱ͖·ͤΜɻ
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”
ଞʹ ศརͳΦϖϨʔλ͕ ͨ͘͞Μ͋Γ·͢ ࢀߟɿ http://reactivex.io/documentation/operators.html http://rxmarbles.com/
ศརͳΦϖϨʔλͷҰྫ • zip, merge, combineLatest … ෳͷετϦʔϜΛฒྻʹಈ͔ͯ̍ͭ͠ͷετϦʔϜʹ·ͱΊΔɻ • catchError
… Τϥʔ͕ൃੜͨ͠ͱ͖ʹϦΧόϦॲཧΛͯ͠onNext ʹม͢Δɻ࠶ΤϥʔΛ͛Δ(throw)͜ͱͰɺผͷΤ ϥʔʹม͢Δ͜ͱͰ͖Δ • distinctUntilChanged … ॏෳআ֎ɻετϦʔϜதʹมߋ͕͋ͬͨͱ͖͚ͩ௨͢Δ • throttle, debounce … ࿈ଧࢭʹ͑ΔϑΟϧλɻσʔλΛड͚औͬͨΒҰఆ࣌ؒؒΛ։͚ͳ͍ͱ͕࣍ൃՐ͠ͳͨ͘͠Γ͢Δ • toArray … ྻʹ·ͱΊΔɻcompleted·Ͱͬͯ̍ͭͷྻʹม͢Δ • groupBy … ετϦʔϜͷσʔλΛ͖ͳ݅ͰάϧʔϓԽ͢Δ
Try Rx!
RxSwift/RxCocoa ͷ Πϯετʔϧ ᶃ CocoaPods → Podfile: ᶄ pod install
ᶅ .swift ϑΝΠϧͰimport ※Carthage / Swift Package Manager ʹରԠͯ͠·͢ɻ https://github.com/ReactiveX/RxSwift 3Y$PDPBʹ͍ͭͯޙड़ ·ͨ
Hello, Rx world ˠ
Hello, Rx world2 ˠ
Hello, Rx world3 ˣ
RxCocoa ʹ͍ͭͯ RxSwift ͷαϒηοτతͳϥΠϒϥϦͰ͢ɻ RxSwift ͕७ਮͳ Rx ࣮ͰɺRxCocoa iOS/Mac։ൃʹศརͳଐΫϥεɾ֦ு
Λఏڙ͍ͯ͠·͢ɻ RxCocoa Λ͏ʹ RxSwift ͱผʹϥΠϒϥϦΠϯετʔϧ͕ඞཁʹͳΓ·͢ɻ > pod ‘RxCocoa' Ͱ pod install ͯ͠ɺswiftίʔυͰ import RxCocoa Λॻ͍͓ͯ͘ͱ͑·͢ɻ
RxCocoa ͕ఏڙ͢Δػೳͷྫ
UIKit ఏڙΫϥεͷ rx Խ UIView, URLSession ͳͲUIKit,͕ఏڙ͢ΔΫϥεͷϓϩύςΟɾΠϕϯτ ΛrxԽͯ͠ɺObservableΠϯελϯεͱͷ૬ޓόΠϯυΛՄೳʹ͢Δɻ ྫɿ -
ࣈΛςΩετೖྗͨ͠Βϥϕϧʹܭࢉ݁ՌΛදࣔ͢Δɻ - ϘλϯΛԡͨ͠ΒAPI௨৴ͯ͠ɺAPI࣮ߦ݁ՌΛϥϕϧʹදࣔ͢Δɻ - URLSession ͷAPI௨৴݁ՌJSONΛܗͯ͠ϓϩϑΟʔϧը໘ʹදࣔ
͓ͬͯ͘ͱྑ͍͔ɻ • RxAlamofire ͳͲ୳ͤઌਓ͕RxԽͯ͘͠ ΕͯΔͷɺެ։͞ΕͯΔίʔυ͕݁ߏ͋ Γ·͢ɻ
·ͱΊ
·ͱΊ • σʔλͷΓऔΓΛετϦʔϜͱͯ͠ߟ͑Α͏ • ͱΓ͋͑ͣRxͷετϦʔϜ(Observable)ʹͰ͖ͨ Βͬͪ͜ͷͷɻͲ͏Ճͯ͠తͷܗࣜʹ͢Δ ͔Λߟ͑Α͏ɻ • RxΛۃΊͨΒϩδοΫ͕γϯϓϧʹ෭࡞༻ͳ͘ɺ εϚʔτʹॻ͚ΔΑ͏ʹͳΔɻඇಉظॲཧා͘
ͳ͍ʢͣʣ
͍͞͝ʹ • tech vein Ͱ͜ΜͳΞϓϦΤϯδχΞɺ ϑϦʔϥϯεɾύʔτφʔ༷Λืू͍ͯ͠·͢ɻ • RxSwift, RxJava Λ͍͍ͨ
• MVVMɺ CleanArchitectureɺ DI Λ׆༻ͨ͠ઃܭʹڵຯ͕͋Δ ڵຯ͕͋ΔํɺͪΐͬͱΛฉ͍ͯΈ͍ͨํ ͨͩ3YͷΛͬͱฉ͖͍ͨํ ͥͻ͓͕͚Լ͍͞ʂ
ࢀߟ • ࠓճͷαϯϓϧίʔυஔ͖ɹʴ RxCocoa Λͬͨ؆୯ͳΞϓ Ϧ • GitHub: https://github.com/ecoopnet/rxswift-beginner •
ࢀߟهࣄ • Կͱͳ͘RxJavaΛͬͯΔ͚Ͳਖ਼Α͔ͬͯ͘ͳ͍ਓ͕ಡ Ήͱྑͦ͞͏ͳهࣄɾجૅฤ https://qiita.com/k-mats/items/4d374460a3f6284dd09f
͕࣌ؒ͋ΕαϯϓϧΞϓϦσϞ
͝ਗ਼ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠
Driver ͷ͍ํ Observable ͱ΄΅ಉ͡
Driver ͷ͍ํ Observable ͱ΄΅ಉ͡ʁ →Τϥʔॲཧ͕ཁΒͳ͍ͷࡉ͔͍ҧ͍͋Δ
Driver (ิ) ۩ମతʹ observable.asDriver(onErrorJustReturn: “”) ͱ͢Δͱ - UIεϨουͰॲཧɿ .observeOn(MainScheduler.instance) -
Cold -> Hot มɿ .share(replay:1) - Τϥʔ࣌ʹࢹ͕ࢭ·ΔͷΛ͙ͨΊͷϦΧόϦॲཧɿ .catchError({ _ in “” }) Λ·ͱΊͯͬͯ͘ΕΔΑ͏ʹͳΓ·͢ɻ ˎ