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RxSwift reintroduction
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USAMI Kosuke
June 29, 2018
Programming
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800
RxSwift reintroduction
Mobile Act OSAKA #5
https://mobileact.connpass.com/event/86668/
USAMI Kosuke
June 29, 2018
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Transcript
RxSwift ࠶ೖ USAMI Kosuke Fenrir Inc.
RxSwift ͱ
RxSwift ͱ • ඇಉظͷΠϕϯτΛड͚औΔͨΊͷΈ • UI Πϕϯτड͚औΓ • Web API
Ϩεϙϯεड͚औΓ • σʔλͷมԽͷࢹ
ίʔυྫ : UIButton button.rx.tap .subscribe { [unowned self] _ in
// Ϙλϯλοϓ࣌ͷॲཧ } .disposed(by: disposeBag)
ίʔυྫ : UITextField textField.rx.text .subscribe { [unowned self] _ in
// ςΩετೖྗ࣌ͷॲཧ } .disposed(by: disposeBag)
ίʔυྫ : Notification NotificationCenter.default.rx.notification(..) .subscribe { [unowned self] _ in
// ௨ड͚औΓ࣌ͷॲཧ } .disposed(by: disposeBag)
ίʔυྫ : URLSession session.rx.response(request) .catchError { // Τϥʔ࣌ͷॲཧ .subscribe {
// Ϩεϙϯεड͚औΓ࣌ͷॲཧ } .disposed(by: disposeBag)
ΠϕϯτॲཧͷྲྀΕ • Observable ʹ Πϕϯτ͕ྲྀΕͯ͘Δ Sequence • rx.tap, rx.text, rx.notification,
rx.response • Observable Λ subscribe ͢ΔͱΠϕϯτΛड͚औΕΔ • dispose ʹ subscription ͷഁغ
ิɿObservable ʹྲྀΕͯ͘Δͷ • ྲྀΕͯ͘ΔΠϕϯτ enum Ͱఆٛ͞Ε͍ͯΔ • .next :
• .error : Τϥʔऴྃ • .completed : ਖ਼ৗऴྃ
σʔλόΠϯσΟϯά
σʔλόΠϯσΟϯά • ྫ͑ɾɾɾ • ϞσϧͷͷมԽΛ UI ʹ͍͑ͨ • UI ͷͷมԽΛϞσϧʹ͍͑ͨ
• ͦͷͨΊͷखஈͱͯ͠ RxSwift ͕͑Δ
σʔλόΠϯσΟϯάͷͨΊͷखஈ • BehaviorRelay / PublishRelay • Observable ͷҰछ • .next
͚͕ͩྲྀΕΔɺऴྃ͠ͳ͍
Relay ͷ͍ํ : accept • accept Ͱ Relay ʹ .next
ΠϕϯτΛૹΔ͜ͱ͕Ͱ͖Δ let relay = BehaviorRelay<String>(value: "000") relay.accept("111") relay.accept("222")
Relay ͷ͍ํ : bind • subscribe ͷΘΓʹ bind ͕͑Δ relay
.bind(to: label.rx.text) textField.rx.text .bind(to: relay)
BehaviorRelay / PublishRelay • ྆ऀͷҧ͍ • ॳظΛ࣋ͭ / ࣋ͨͳ͍ •
value ϓϩύςΟͰݱࡏ͕औಘͰ͖Δ / Ͱ͖ͳ͍ • subscribe ͨ͠ͱ͖ݱࡏ͕ྲྀΕΔ / ྲྀΕͳ͍
ViewModel struct ViewModel { let username = BehaviorRelay<String>(value: "") }
ϞσϧͷͷมԽΛ͑Δ class ViewController { override func viewDidLoad() { viewModel.username .bind(to:
label.rx.text) .disposed(by: disposeBag) } }
UI ͷͷมԽΛ͑Δ class ViewController { override func viewDidLoad() { textField.rx.text.orEmpty
.bind(to: viewModel.username) .disposed(by: disposeBag) } }
όΠϯσΟϯάͷ͖
όΠϯσΟϯά୯ํ • ʮόΠϯσΟϯάʯͱ͍͏ͱํͬΆ͍͚Ͳɾɾɾ • RxSwift ͷ߹୯ํ • bind ࣮ subscribe
Ͱ͋Δ͜ͱΛΔͱ͔Γ͢ ͍
ํόΠϯσΟϯάผʹ͍Βͳ͍ • ํͩͱσʔλͷྲྀΕͷ In / Out ͕۠ผͮ͠Β͍ • ΞϓϦઃܭͱͯ͠ɺσʔλͷྲྀΕΔํΛҙࣝͰ͖Δ͜ͱେ ࣄ
RxSwift Λ͏͏͑Ͱ ͷཹҙ
ͳΜͰͰ͖͗͢Δ • ڧྗͳπʔϧͷͨΊແઅૢʹ͏ͱ͜Μ͕Β͕Δ͜ͱ͋Δ • ΞϓϦઃܭΛߟ͓͑ͯ͘ • RxSwift ͕Կ͔ͷΞϓϦઃܭΛ༩͑ͯ͘ΕΔΘ͚Ͱͳ͍ • ΞϓϦઃܭʹରͯ͠ɺ࣮Λָʹ͢Δπʔϧ
ϥΠϒϥϦࣗମͷن͕େ͖͍ • ༷ʑͳΫϥε͕͋ͬͯѲͮ͠Β͍ • খ͞ͳΛղܾ͍͚ͨͩ͠ͳΒಋೖΛͨΊΒ͏߹
্खʹ͖߹͑ศར • ͍Ͳ͜ΖΛͪΌΜͱߟ͑ͯ͑ɺͱͯศར • Enjoy RxSwift !