ReactiveCocoa Pitfalls at freee

10/18にfreeeで開催されたReactiveCocoa TokyoのLT資料です
http://connpass.com/event/8680/

http://www.freee.co.jp/

Transcript

1. ReactiveCocoa
   Pitfalls at freee
   @yonekawa
   

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2. freeeͷiOSΞϓϦ͕
   ReactiveCocoaΛಋೖ͔ͯ͠
   Β̕ϲ݄͕ܦͪ·ͨ͠
   

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3. • 2014/12/20 iOSΞϓϦ։ൃணख
   • 2014/01/10 ReactiveCocoaಋೖ
   • 2014/02/14 1.0.0ϦϦʔε
   

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4. ೥຤ʹҰମԿ͕ɾɾɾ
   

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

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6. combineLatestWith
   

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

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8. rac_textSignal
   

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

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10. sendCompleted
    

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

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13. [RACSignal empty]
    

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

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16. UITableView
    

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

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18. ReactiveCocoa3.0
    

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

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