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ReactiveCocoa Pitfalls at freee @yonekawa

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freeeͷiOSΞϓϦ͕ ReactiveCocoaΛಋೖ͔ͯ͠ Β̕ϲ݄͕ܦͪ·ͨ͠

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• 2014/12/20 iOSΞϓϦ։ൃணख • 2014/01/10 ReactiveCocoaಋೖ • 2014/02/14 1.0.0ϦϦʔε

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೥຤ʹҰମԿ͕ɾɾɾ

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ReactiveCocoaΛ࢖͍ͬͯͯ freeeͰى͖ͨ໰୊΍ ϋϚΓͲ͜ΖΛ঺հ͠·͢ ஫: ReactiveCocoaͷAPI͕ͪΐ͍ͪΐ͍ग़͖ͯ·͢

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combineLatestWith

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combineLatestWithͱSignalͷ࣮ߦॱ • combineLatestWith͸ฒྻʹSignalΛ࣮ߦ͢Δ ͷͰൃՐ͞ΕΔॱং͸ෆఆɻϩάΠϯ͔ͯ͠Βσʔ λΛऔಘɺΈ͍ͨͳॲཧʹ࢖͏ͱϋϚΔ • ௚ྻʹ͍ͨ࣌͠ʹ͸flattenMapΛ࢖͏

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rac_textSignal

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rac_textSignal vs RACObserve • textϓϩύςΟʹ௚઀୅ೖ͢ΔΑ͏ͳέʔεͰγ άφϧ͕ൃՐ͠ͳ͍ɻRACObserveͰtextϓϩύ ςΟΛsubscribe͢ΔͱൃՐ͢Δ • ٯʹΩʔϘʔυ͔Βͷೖྗ͸RACObserveͩͱൃՐ ͠ͳ͍ɻrac_textSignalͰऔΒͳ͍ͱ͍͚ͳ͍ • combineLatestͯ྆͠ํൃՐ͢ΔsignalΛ࡞ͬ ͨΓͨ͠

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sendCompleted

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sendErrorͷޙͷsendCompleted • sendErrorͷޙʹsendCompletedΛݺΜͰ΋ݺ ͹Εͳ͍ɻ • subscribe͢ΔଆͰnextͱerrorͰڞ௨Ͱ΍Γͨ ͍ॲཧʢΠϯδέʔλΛࢭΊΔͱ͔ʣΛॻ͖͍ͨ࣌ ʹ͸ݸผʹॻ͔ͳ͍ͱ͍͚ͳ͍

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[RACSignal empty]

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[RACSignal empty] • RACSignalϕʔεͰ΍ΓऔΓ͍ͯ͠Δ࣌ɺ [RACSignal empty]Λฦ͢ͱ౰વnext΋error΋ൃ Ր͞Εͳ͍ • subscribeલʹΠϯδέʔλΛճͯ͠nextͱerrorͰ ࢭΊ͍ͯΔ৔߹ɺΠϯδέʔλ͕ճΓͬͺͳ͠ʹͳΔ • empty͡Όͳۭͯ͘ͷ݁ՌΛฦ͢SignalΛฦ͢ͷ͕Α ͦ͞͏

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UITableView

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Cellͷதʹsubscribe͍ͨ͠View͕͋Δ࣌ • ηϧ͕࠶ར༻͞ΕΔͱೋॏʹϑΥʔ ϜͷΠϕϯτΛsubscribeͯ͠ ͠·͏ • reloadͳͲߟ͑Δͱ subscriberΛഁغ͢ΔλΠϛϯ ά͕೉͍͠ • ݱঢ়͸ۤ೑ͷࡦͰ࠶ར༻΍ΊͨΓ ͯ͠Δ

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ReactiveCocoa3.0

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ReactiveCocoa3.0 • LTͷͨΊʹແ஡ͯ͠ಋೖ͠Α͏ͱௐ΂ͨ • طଘͷRACSignalϕʔεͷΠϯλϑΣʔεΛ asColdSignalͱ͔Ͱ͖Δͷ͸ָͦ͏ͩͬͨ • υΩϡϝϯτແ͠Ͱ࢖͍ํΛ୳Δͷ௒೉͍͠