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Promise͔ΒReactive΁ͷҠߦΛ໛ࡧ͢Δ Gotanda.mobile #2 @horimislime 1

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self • @horimislime • גࣜձࣾτϨλ @ޒ൓ాTOC • ҿ৯ళ޲͚iPad୆ாΞϓϦΛ։ൃͯ͠·͢ 2

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͓࿩ • PromiseͰඇಉظϓϩάϥϛϯά͍ͯ͠Δ/͠Α͏ͱ͍ͯ͠Δਓ ʹ΋ReactiveΛΦεεϝ͢Δ࿩ • ๭ࣾͷΞϓϦͰͷࣄྫΛఴ͑ͯ 3

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Objective-Cࢿ࢈ͷ͋ΔΞϓϦ • BoltsFrameworkʹΑΔPromise • APIClient͕BoltsͷTaskΛฦ͢ • ্Ґ૚Ͱ΋޿ൣғʹBoltsʹґଘ 4

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ͦͯ͠SwiftҠߦظ΁ • Bolts͸AnyObject͕ฦ͖ͬͯͯπϥ͍ • SwiftyͳPromiseͷඞཁੑ • ͦͷޙ৭ʑ͋ͬͯҎԼʹґଘ͍ͯ͠Δ • Bolts-Objc • SwiftTask • Bolts-Swift 5

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PromiseͰͷ՝୊ײ • ଟ͘ͷ΋ͷͰErrorͷܕࢦఆ͕Ͱ͖ͳ͍ࣄ΁ͷෆຬ • ϝϯςφϯε͕׆ൃͰͳ͍΋ͷ͕ग़͖ͯͭͭ͋Δ 6

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enum AppError: Error { case offline case network } get(userId: 1234).then { user in ... }.catch { error in // ! switch error as! AppError { ... } } 7

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ɹɹɹ ݁Ռͷܕࢦఆ Errorͷܕࢦఆ Swift3 Bolts-Swift ✅ ❌ ✅ PromiseKit ✅ ❌ ✅ SwiftTask ✅ ✅ ❌(branch༗) 8

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Reactiveͷػӡ • SwiftҠߦͱڞʹSwiftBondΛ࢖͍࢝Ίͯͨ • ReactiveKitͱ͍͏฼ମʹґଘ • PromiseͰ΍Γ͍ͨࣄ͸େମͰ͖Δ 9

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Promise෩ຯͳReactiveKit findPrinter() .flatMapLatesst { printer in return send(document, to: printer) }.flatMapLatest { result in return process(result) }.observe { event in switch event { case .completed: Progress.dismiss() case .failed(let error): switch error { case .network: Progress.showError("Network error!") ... } } } 10

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ϝϦοτ • ͦΜͳʹҧ࿨ײ΋ͳ͍͠ɺbinding͚ͩͰͳ͘ඇಉظॲཧָ͕ • طʹView bindingΛ࢖͍ͬͯΕ͹਌࿨ੑ˕ • ௕ظతͳϝϯςφϯε΁ͷظ଴ 11

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ಋೖͷোน • Reactiveͷֶशίετ΁ͷݒ೦ • ͜ͷ1೥͘Β͍ͰσϑΝΫτԽͨ͠ײ͕͋Δ • View Bindingʹ࢖͏ͳΒશମతʹReactiveԽͨ͠ํ͕౎߹ ͕ྑ͍͜ͱ΋ଟ͍ 12

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ߟ͓͑ͯ͘΂͖ࣄ • Promise / Rxؔ࿈͸ෳ਺ϨΠϠͰ࢖༻͕ͪ͠ • Լखʹબ୒͢Δͱ๲େͳҠߦίετͰࢮ͵ • ࠷΋কདྷੑΛߟྀ͢Δ΂͖ॴ 13

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·ͱΊ • SwiftΛऔΓר͘Promiseࣄ৘ • Reactiveͷোน͸ݮͬͯΔ͠ಋೖͷνϟϯε ! • ٕͨͩ͠ज़બఆ͸৻ॏʹ 14