RxSwiftと愉快な仲間たち / RxSwift with Units

by Mihyaeru

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RxSwiftͱ༇շͳ஥ؒͨͪ Gotanda.mobile #1 in Mobile Factory on 2016/05/20 ϛώϟΤϧ@mihyaeru21

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͓·͑୭Α • ϛώϟΤϧ @mihyaeru21 • ࠷ۙͷݴޠɿSwift/Kotlin/Perl • ·ͩ·ͩϋϯλʔ • ϞφυΛཧղ͍ͨ͠

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RxSwit

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Unit

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Unit • Driver • Variable • ControlEvent/ControlProperty

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Unit • RxCocoa͕ఏڙ͢Δศར͘Μ • ෺ཧͱ͔ͷ୯Ґͱͯ͠ͷUnitʹ͔͚͍ͯΔΒ͍͠ ※RxCocoaʹؚ·ΕΔͱެࣜυΩϡϝϯτʹ͋Δ͚ͲVariable͸RxSwiftʹؚ·ΕΔ

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Driver

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Driver • Τϥʔ͕ྲྀΕͳ͍ • observe on ϝΠϯεϨου • share͞ΕΔ • (ਖ਼֬ʹ͸ shareReplayLatestWhileConnected )

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Driver • ϞσϧͱUIͷؒʹೖͬͨΓ • UIͱUIΛܨ͍ͩΓ • ϋʔυ΢ΣΞͷυϥΠόιϑτ΢ΣΞతͳͱ͜Ζ͔Β  ໊෇͚ΒΕͨ

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Driver fetchUser() .map { $0.name } .observeOn(MainScheduler.instance) .bindTo(label.rx_text)

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Driver fetchUser() .map { $0.name } .observeOn(MainScheduler.instance) .bindTo(label.rx_text) όοΫάϥ΢ϯυͰσʔλΛऔͬͯ͘Δ UIͷߋ৽͸ϝΠϯεϨουඞਢ ϥϕϧͷςΩετʹόΠϯυ͢Δ

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Driver fetchUser() .map { $0.name } .asDriver(onErrorJustReturn: "") .drive(label.rx_text)

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Driver fetchUser() .map { $0.name } .asDriver(onErrorJustReturn: "") .drive(label.rx_text) Driverʹม׵ ϥϕϧͷςΩετʹόΠϯυ͢Δ

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Driver let userName = fetchUser() .map { $0.name } .observeOn(MainScheduler.instance) userName.bindTo(label.rx_text) userName.bindTo(otherLabel.rx_text)

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Driver let userName = fetchUser() .map { $0.name } .observeOn(MainScheduler.instance) .share() userName.bindTo(label.rx_text) userName.bindTo(otherLabel.rx_text) share()͠ͳ͍ͱ2ճൃՐ͢Δ

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Driver let userName = fetchUser() .map { $0.name } .asDriver(onErrorJustReturn: "") userName.drive(label.rx_text) userName.drive(otherLabel.rx_text)

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Driver let userName = fetchUser() .map { $0.name } .asDriver(onErrorJustReturn: "") userName.drive(label.rx_text) userName.drive(otherLabel.rx_text) share()తͳ͜ͱΛ͍ͯ͠Δ͔ΒൃՐ͸1ճͷΈ

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Driver • ʮͦΕɺObservableͰ΋Ͱ͖ͯΔ͡ΌΜʯ • ͸͍

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Driver • UIͱܨ͙ҙਤΛ໌֬ʹ͢Δ • ҆શ౓ΛߴΊΔ • Driverʹม׵ޙ͸observeεϨουͷมߋ͸Ͱ͖ͳ͍ • share()ͯ͘͠ΕΔ

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Variable

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Variable • Τϥʔ͕ྲྀΕͳ͍ • share͞ΕΔ

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Variable • BehaviorSubjectͷWrapper • valueϓϩύςΟΛ௨ͯ͠࠷৽ͷ஋ʹΞΫηεͰ͖Δ • valueϓϩύςΟ΁ͷ୅ೖ͸on(.Next)ͱͯ͠ྲྀΕΔ • ObservableʹͳΔ͚ͲObserverʹ͸ͳΒͳ͍ • ஋Λྲྀͨ͢Ίʹ͸valueΛඞͣܦ༝͢Δ

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Variable let variable = Variable(0) variable .asDriver() .map { "value: \($0)" } .drive(label.rx_text) variable.value = 99 print("variable.value = \(variable.value)")

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Variable let variable = Variable(0) variable .asDriver() .map { "value: \($0)" } .drive(label.rx_text) variable.value = 99 print("variable.value = \(variable.value)") label.text͕”value: 99”ʹͳΔ Variable͸ΤϥʔΛྲྀ͞ͳ͍͔Β Ҿ਺ແ͠൛ͷasDriver()͕͋Δ ಉظతʹ஋ΛऔಘͰ͖Δ

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ControlEvent ControlProperty

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ControlEvent/ControlProperty • Τϥʔ͕ྲྀΕͳ͍ • subscribe on ϝΠϯεϨου • observe on ϝΠϯεϨου • share͞ΕΔ

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ControlEvent/ControlProperty • UIύʔπͷΠϕϯτΛRxͱͭͳ͗ࠐΈ΍͘͢ • ControlEvent • Observable • ControlProperty • Observable / Observer • Observer΋͋Δ

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ControlEvent/ControlProperty textField.rx_text .asDriver() .drive(label.rx_text) ControlProperty Observer ControlProperty͸ΤϥʔΛྲྀ͞ͳ͍͔Β Ҿ਺ແ͠൛ͷasDriver()͕͋Δ

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ControlEvent/ControlProperty textField.rx_text .bindTo(label.rx_text) ControlPropertyͷΠϕϯτ͸ϝΠϯεϨουͰྲྀΕΔ

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ControlEvent/ControlProperty button.rx_tap .asDriver() .map { "tapped!" } .drive(textField.rx_text) ControlEvent΋ΤϥʔΛྲྀ͞ͳ͍͔Β Ҿ਺ແ͠൛ͷasDriver()͕͋Δ ControlEvent ControlProperty

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ControlEvent/ControlProperty • Cocoaͷ͍ΖΜͳ΍ͭʹ rx_* ͕ੜ͍͑ͯͯΖ͍Ζศར • https://github.com/ReactiveX/RxSwift/blob/master/ Documentation/API.md

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౜ಥͳ·ͱΊ • ศརػೳͨͪ • Driver • Variable • ControlEvent/ControlProperty • ͳͯ͘΋ࢮͳͳ͍͚Ͳ͋Δͱ஍ຯʹศར • ஍ຯʹ࢖ͬͯ͜