Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
川で例えずに理解するObservable
Search
Yoshikuni Kato
February 14, 2017
Programming
3
2.7k
川で例えずに理解するObservable
Presented at 集まれSwift好き!Swift愛好会 vol16
https://love-swift.connpass.com/event/48820/
Yoshikuni Kato
February 14, 2017
Tweet
Share
More Decks by Yoshikuni Kato
See All by Yoshikuni Kato
The Elm Architecture & Swift
yoching
0
1k
iOS developers community in Tokyo
yoching
0
740
Swiftエンジニアが海外のポジションに応募する
yoching
10
3.1k
App Architecture By Manual DI
yoching
0
720
Passing function to function arguments
yoching
0
720
「新規アプリの設計」を設計する
yoching
1
1.9k
App Architecture By Manual DI
yoching
2
580
関数を引数として渡す書き方のポイント
yoching
0
820
App Architecture Sample
yoching
0
100
Other Decks in Programming
See All in Programming
『リコリス・リコイル』に学ぶ!! 〜キャリア戦略における計画的偶発性理論と変わる勇気の重要性〜
wanko_it
1
590
DynamoDBは怖くない!〜テーブル設計の勘所とテスト戦略〜
hyamazaki
1
210
開発チーム・開発組織の設計改善スキルの向上
masuda220
PRO
13
6.9k
オホーツクでコミュニティを立ち上げた理由―地方出身プログラマの挑戦 / TechRAMEN 2025 Conference
lemonade_37
2
490
WebAssemblyインタプリタを書く ~Component Modelを添えて~
ruccho
1
900
CEDEC 2025 『ゲームにおけるリアルタイム通信への QUIC導入事例の紹介』
segadevtech
3
960
Langfuseと歩む生成AI活用推進
licux
3
290
フロントエンドのmonorepo化と責務分離のリアーキテクト
kajitack
2
130
The state patternの実践 個人開発で培ったpractice集
miyanokomiya
0
150
大規模FlutterプロジェクトのCI実行時間を約8割削減した話
teamlab
PRO
0
490
バイブコーディング × 設計思考
nogu66
0
130
UbieのAIパートナーを支えるコンテキストエンジニアリング実践
syucream
2
680
Featured
See All Featured
Art, The Web, and Tiny UX
lynnandtonic
302
21k
Why Our Code Smells
bkeepers
PRO
338
57k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
21k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
Bash Introduction
62gerente
614
210k
Intergalactic Javascript Robots from Outer Space
tanoku
272
27k
Rails Girls Zürich Keynote
gr2m
95
14k
VelocityConf: Rendering Performance Case Studies
addyosmani
332
24k
How to train your dragon (web standard)
notwaldorf
96
6.2k
Gamification - CAS2011
davidbonilla
81
5.4k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
161
15k
Transcript
Ͱྫ͑ͣʹཧղ͢ΔObservable @yoshikuni_kato Swi$Ѫձ vol16 2017/02/14! 1
Who am I? • Ճ౻༝܇ʢYoshikuni Katoʣ @yoshikuni_kato • iOSΤϯδχΞ •
Yahoo! Japan -> Φϋί • ʮϥδ͐ʯ͘Μ → • Interests: ઃܭ / FRP / Coordinator PaCern / UI࣮ • try! SwiFʢ&ϋοΧιϯʣߦ͖·͢ʂ 2
Agenda 1. ͡Ίʹɹ~ObservableͷΑ͋͘Δྫ͑~ 2. Ͱྫ͑ͣʹཧղ͢ΔObservable 3. Hot / ColdʢReac7veSwi;ͷεεϝʣ 3
͡Ίʹ 4
Func%onal Reac%ve Programming • ϓϩάϥϛϯάͷύϥμΠϜ • swi% libraries • Reac.veSwi%
(Reac.veCocoa) ɹɹ˞ Reac.veCocoa3͔Βswi%Խ͞Ε͍ͯ·͢ʢݱࡏɺ5ʣ ɹɹ˞ 5ͰϦϙδτϦ͕ཧ͞ΕɺຊମʢReac.veSwi%ʣͱUIKit֦ு ʢReac.veCocoaʣͱͳΓ·ͨ͠ • RxSwi% • RxͱݺͣʹFRPͱݺͼ͍ͨ 5
Observableͱ • Observable ɹ= Stream of values over 2me ɹ࣌ؒ࣠ʹԊͬͯൃੜ͢ΔͷετϦʔϜ
1 ! Observableͬͯɺʮ؍Ͱ͖Δʯͬͯ ͍͏ҙຯͩΑͳ͊ɾɾɾ ɹʮ࣌ؒʯʮετϦʔϜʯͱͲ͏͍͏ ؔͳΜͩΖ͏ʁ 1 The introduc.on to Reac.ve Programming you've been missing 6
Α͋͘Δྫ͑ • Observable = ! ͬͯʢιϑτΣΞతʹʣԿʁ ɹ ਫͲ͔͜ΒྲྀΕͯ͘Δͷʁ ɹ
ྲྀΕͨਫͲ͜ʹߦͬͯ͠·͏ͷʁ ɹ HotͱCold͕͋ΔΈ͍͚ͨͩͲɾɾɾɾ 7
ྫ͑Δ͜ͱͷޭࡑ ! - ͱ͖ͬͭͦ͢͏ʹࢥ͑Δ ! - ؒҧͬͨʢ࣮ͱҟͳΔʣཧղΛͯ͠͠·͏Մೳੑ͕͋Δ - தͷιʔεΛͲ͏ಡΜͰ͍͍͔͔Βͳ͍ ιϑτΣΞతͳߏΛཧղ͢Δ͜ͱॏཁ
8
Ͱྫ͑ͣʹཧղ͢ΔObservable 9
ऍ • FRPڞ௨ͷߟ͑ํʢͷͣʣ • Reac(veSwi-ϕʔε • RxSwi-ͷํιʔεΛ͖ͪΜͱಡΊͳ͔ͬͨͷͰɺؒҧͬͯ ͍ͨΒ͢Έ·ͤΜ! • ྫͱ্ͯ͛͠Δίʔυ͔ͳΓ؆ུԽͨ͠ͷ
10
Observerύλʔϯ͕جૅ 11
Observer = closure ʢΫϩʔδϟʔͷബ͍ϥούʔͱ࣮ͯ͠ʣ • ͲΜͳΫϩʔδϟʔ͔ʁ Event -> Void {
event: Event in // logics when changed } 12
Event // ReactiveSwift-1.0 ͷ߹ enum Event<Value, Error> { // RxSwiftͰErrorͷࢦఆͳ͠
case value(Value) // RxSwiftͷ߹next case failed(Error) // RxSwiftͷ߹ error(Swift.Error) case completed case interrupted // ReactiveSwiftͰͳ͠ } 13
Observable = Observerͷొઌ • Observable means "؍Ͱ͖Δͷ" • Observerͷcollec0onΛ͍࣋ͬͯΔ //
ΠϝʔδͰ͢ʂʂ class Observable { var observers: [Observer] } ※ ࣮ࡍʹɺλμͷྻͰͳ͘ɺͬͱෳࡶͳػߏͰ͢ 14
observe = ObserverΛొ͢Δ Observer(closure)ΛɺObservableͷObserver collec/onʹՃ͢Δ ※ Rxܥͩͱ"subscribe"ͱ͍͏໊લ 15
Observable = Stream of values over 1me ͱ ઌʹΫϩʔδϟʔ͕ొ͞Εͯ͋Δ ʹ
ʢObservableଆ͔ΒݟΕʣ ɹɹҙͷλΠϛϯάͰɺొ͞ΕͨΫϩʔδϟʔΛ࣮ߦͰ͖Δ → ࣌ؒʹԊͬͯൃੜ͢ΔΛදݱͰ͖Δ → มͦͷͷ͕ɺετϦʔϜʢΛநԽͨ͠ͷʣͱଊ͑ΒΕΔ ※ खଓ͖ܕతͳʮม͕ϝϞϦྖҬ(orΦϒδΣΫτ)Λ͍ࣔͯ͠Δʯ ͱ͍͏͜ͱΑΓந͕ߴ͍ 16
1 1 The introduc.on to Reac.ve Programming you've been missing
17
ʢ༨ஊʣ໋໊͕͔Γʹ͍͘ʁ ӳޠతɿObserver observe observable. (S-V-O) ίʔυɿobservable.observe(observer) ӳޠతͳҙຯͱ࣮ࡍͷڍಈ͕ର ʢຊདྷɺobservable.observed(by: observer)ɹͳͲʣ Reac%veSwi*Ͱଟগٞʹͳ͍ͬͯΔ
2 2 Rename Signal.observe(_:) 18
operator = observable -> observableͷม • map / filter /
flatMap / combineLatestͳͲͳͲɾɾɾ • RxMarble / RACMarbleΛࢀর 19
ʮҙͷλΠϛϯάͰ࣮ߦ͢ΔʯͷΈ Reac%veSwi*ͷ߹ • Signal(HotObservable)innerObserverͱηοτͰ࡞ΒΕɺinnerObserverSignalͷࢀরΛ࣋ͭ • innerObserverΛ࣮ߦ͢ΔʢobserverʹΠϕϯτΛ͢ʣ -> SignalͷobserversΛશͯʹΠϕϯτΛ͢ // Πϝʔδ
let innerObserver = { event in for observer in signal.observers { observer.send(event) } } • operator(map/filter/...)ɺ͜ͷinnerObserverΛɺલͷSignalͷobserverʹొ͢ΔΑ͏ͳܗ 20
Hot / Cold ʢReac%veSwi*ͷεεϝʣ 21
Hot / Cold • Hot / Coldʢ֓೦ʣ͔ΒೖΔͱ͔Γʹ͍͘ • Reac.veSwi3ͷߟ͑ํ͕ࢀߟʹͳΔ 22
Reac%veSwi*(Cocoa)ʹ͓͚Δ Hot/Cold • Reac&veCocoa2·ͰɿHot/Cold྆ํಉ͡ܕʢࠓͷRxͱಉ༷ʣ • Reac&veCocoa3Ҏ߱ɿHot/ColdΛܕͰ • Hot : Signal
• Cold: SignalProducer ͭ·ΓʮHotObservable ͱ ͦͷੜثʯͱཧղͰ͖Δ 23
Signal / SignalProducerʹ͍ͭͯ Qiitaʹ࠷ۙهࣄΛॻ͖·ͨ͠ Reac%veSwi* جຊཁૉͷ͍ํ Signal / SignalProducerฤ 24
Reac%veSwi* vs RxSwi* 25
Reac%veSwi* vs RxSwi* ! • Hot / Coldͷѻ͍͕͔Γ͍͢ • Τϥʔͷܕ͕ࢦఆͰ͖Δ
• ֮͑Δܕ͕গͳ͍ʢSignal/SignalProducer/Property/Ac7on/Disposable͘Β ͍ʣ • தͷ࣮ͷɺϑΝΠϧ͕গͳ͘ɺಡΈͦ͢͏ͳҹʢʹͳͬͨʣ • Carthageͷ࣮ʹ༻͞Ε͍ͯΔ 26
Reac%veSwi*ͷϑΝΠϧߏ 27
Reac%veSwi* vs RxSwi* ! • ຊޠͷυΩϡϝϯτ͕গͳ͍ • ݕࡧͯ͠ɺݹ͍هࣄ(Obj-C)͕ώοτ͕ͪ͠ • όʔδϣϯʹΑΔഁյతมߋ͕ଟ͍
• ίϛϡχςΟ͕ऑΊʢRealmͱͷ࿈ܞͳͲʣ • ΦϑΟγϟϧͷαϯϓϧͳͲ͕ͳ͍ 28
·ͱΊ 29
·ͱΊ • FRPΦϒβʔόʔύλʔϯ͕ࠜఈʹ͋Δ • ObservableͰΠϕϯτετϦʔϜͦͷͷΛදͤΔ • ιϑτΣΞతͳߏΛཧղ͢Δ͜ͱॏཁ • Reac.veSwi2ʢReac.veCocoaʣͬͯΈ͍ͯͩ͘͞! 30
iOSΤϯδχΞืूத • ࣄۀɿUX/UIσβΠϯ & ։ൃ ɹ ʢࠓͷͱ͜Ζʣ৽نडୗ։ൃϝΠϯ • ࣾһɿ20໊ڧʢiOSΤϯδχΞ 3໊ʣ
• ͪΖΜSwi/ • ։ൃͷࣗ༝ߴ͍ • try ! Swi/ (16/17) / iOSDC εϙϯαʔ • UI࣮͖ͳਓɺઃܭ͖ͳਓٻΉ 31
Thank you! 32
ิ 33
ࢲ͕Reac%veSwi*Λ͍࢝ΊͨܦҢ • ࠷ॳʢ2016/3݄͝ΖʣRxSwi-ΛʢྲྀߦΓͰʣษڧ • Reac1veSwi-Meetup@WantedlyͰReac1veCocoaͷΛฉ͖ɺ ઃܭ͕ྑͦ͞͏ͩͱࢥ͍ɺ͍࢝ΊΔ • @inamy͞Μɺ@ikesyo͞ΜɺNick͞Μ • ࠓޙչ͍ͯ͠ͳ͍
34
ࢀߟ • Reac&veCocoa/Reac&veSwi. • Reac&veCocoa/Reac&veCocoa • RACCommunity • Reac&veX/RxSwi. •
Reac&ve Swi. Meetup @WantedlyΛ։࠵͠·ͨ͠ʂ • @ikesyo͞Μͷࢿྉ • Reac&veSwi. جຊཁૉͷ͍ํ Signal / SignalProducerฤ 35