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ϚϧνεϨουRxSwift @ࣾ಺RxSwiftษڧձ

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߹ΘͤͯಡΈ͍ͨ https://https://speakerdeck.com/ukitaka/rxswift-kodorideingufalsekan-suo-at-she-nei-rxswiftmian-qiang-hui/bricklife/rxswiftfalseobserveontosubscribeonwoli-jie-suru

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ཁίʔυϦʔσΟϯά • ޙͰৄ͘͠આ໌͠·͕͢ɺʮͲͷεϨουͰ subscribe͕ߦΘΕ͔ͨʯ͕ͱͯ΋ॏཁʹͳ͖ͬͯ ·͢ɻ • ͜͜Ͱ͍͏subscribe͸಺෦తͳsubscribe΋ؚΈ ·͢ɻͭ·ΓʮOperator͕͍ͭͲͷεϨουͰ sourceΛsubscribe͢Δ͔ʯΛ೺Ѳ͠ͳ͍ͱɺڍಈ Λཧղ͢Δͷ͕೉͍͜͠ͱ΋͋Δ͔΋͠Ε·ͤΜɻ

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͜ͷεϥΠυͰ͸ • ·ͣɺRxSwiftͱGCDͳͲͷ૊Έ߹ΘͤʹΑΔ ϚϧνεϨου؀ڥͰͷڍಈͷ֬ೝͱಈ࡞ϧʔ ϧͷઆ໌Λߦ͍·͢ɻ • ͦͷޙobserveOnɺsubscribeOnͷڍಈͷઆ ໌Λߦ͍·͢ɻ

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͜ͷεϥΠυͰ͸ • ϚϧνεϨουͱ͍ͬͯ΋ɺଟ͘ͷiOS։ൃऀ͕ڵຯ͕͋Δͷ ͸ʮϝΠϯεϨουʯ͔ʮͦΕҎ֎͔ʯͩͱࢥ͍·͢ɻ • ͜ͷεϥΠυͰ͸ɺʮϝΠϯεϨουͰͳ͍εϨουʯΛ·ͱ ΊͯʮόοΫάϥ΢ϯυεϨουʯͱݺͿ͜ͱʹͯ͠ɺϝΠϯ εϨου͔όοΫάϥ΢ϯυεϨου͔ͷΈʹ஫໨͠·͢ɻ • ͭ·ΓόοΫάϥ΢ϯυεϨου͸ෳ਺͋Γɺ࣮ࡍʹͲͷεϨο υͰॲཧ͞ΕΔ͔͸ɺ(RxSwift͕಺෦తʹར༻͍ͯ͠Δ) GCD ΍NSOperationQueueʹґଘ͢Δ͜ͱʹ஫ҙ͍ͯͩ͘͠͞ɻ

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͜ͷεϥΠυͰ͸ • RxSwift͸ v2.5.0 (2016೥7݄࣌఺Ͱͷmaster) Λݟͯ·͢ɻ • ͨͿΜόʔδϣϯ1ܥ΍ࠓޙͷόʔδϣϯͰ΋ ௨༻͢Δ͔͸ෆ໌Ͱ͕͢ɺͨͿΜେ͖͘ζϨ Δ͜ͱ͸ແ͍ͱࢥ͍·͢ɻ

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લฤ Observableͱ εϨου

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ಈ࡞ϧʔϧ

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ϧʔϧͦͷ1 ௨ৗͷColdͳOperator͸ subscribe͞ΕͨεϨουͰsubscribe on͞ΕͨεϨουͰonΛݺͿɻ

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ϧʔϧͦͷ1(ଓ͖) ಛʹSchedulerͷࢦఆͳͲ͕ͳ͍৔߹ɺ createܥOperator͸subscribeͨ͠ε ϨουͰonΛݺͿɻ

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ݴ༿͚ͩͩͱΑ͘Θ͔ΒΜ

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Sequence Observer

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Sequence Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου

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Sequence Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου on

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Question1 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Map͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. όοΫάϥ΢ϯυεϨου

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ղઆ Sequence Map Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου

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ղઆ subscribe Sequence Map Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου ݺ͹ΕͨεϨουͰ಺෦తʹsourceͷ subscribeΛߦ͏ɻ

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ղઆ subscribe Sequence Map Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribe͕ݺ͹ΕͨεϨουonΛݺͿ

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ղઆ subscribe Sequence Map Observer subscribe on ϝΠϯεϨου όοΫάϥ΢ϯυεϨου on

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Question2 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Map͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. όοΫάϥ΢ϯυεϨου

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ղઆ Sequence Map Observer Publish

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ղઆ Sequence Map Observer Publish subscribe

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ղઆ Sequence Map Observer subscribe Publish subscribe

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ղઆ subscribe Sequence Map Observer subscribe Publish subscribe

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ղઆ subscribe Sequence Map Observer subscribe Publish subscribe subscribe͕ݺ͹ΕͨεϨουonΛݺͿ

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ղઆ subscribe Sequence Map Observer subscribe on on Publish subscribe on

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(ิ଍) ղઆ subscribe Sequence Map Observer subscribe on on Publish subscribe on ಛʹઆ໌ͯ͠ͳ͔͕ͬͨɺSubject΋ on͞ΕͨεϨουͰonΛݺͿ

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Question3 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Map͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. όοΫάϥ΢ϯυεϨου

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ղઆ • refCount() ͸ʮHot͕ͩɺ࠷ॳʹsubscribe͞ ΕΔ·Ͱಈ࡞͠ͳ͍ʯͱ͍͏ڍಈɻͭ·Γ࠷ ॳʹsubscribe͕ݺ͹ΕͨεϨου͕ॏཁɻ • ࠓճ͸࠷ॳʹsubscribeΛݺΜͰ͍Δͷ͕όο Ϋάϥ΢ϯυεϨουͳͷͰόοΫάϥ΢ϯ υͰಈ࡞͢Δɻ

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(࠶ܝ) ϧʔϧͦͷ1 ௨ৗͷColdͳOperator͸ subscribe͞ΕͨεϨουͰsubscribe on͞ΕͨεϨουͰonΛݺͿɻ

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(࠶ܝ) ϧʔϧͦͷ1(ଓ͖) ಛʹSchedulerͷࢦఆͳͲ͕ͳ͍৔߹ɺ createܥOperator͸subscribeͨ͠ε ϨουͰonΛݺͿɻ

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࣍ͷϧʔϧ΁…

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ϧʔϧͦͷ2 createܥͷOperatorʹScheduler͕ࢦ ఆ͞Ε͍ͯΔ৔߹ɺsubscribe͢Δͱͦ ͷScheduler্ͰonΛݺͿɻ ͭ·ΓɺͲͷεϨουͰsubscribe͞Ε ͔ͨ͸ؔ܎ͳ͍ɻ (௕͍)

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Scheduler • createܥͷOperatorʹ͸ɺSchedulerΛࢦఆͰ ͖Δ΋ͷ͕͋Δɻ

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Scheduler • Scheduler͕ࢦఆ͞Ε͍ͯΔ৔߹ʹͲ͏͍͏ڍ ಈʹͳΔ͔ɺͱ͍͏ͷ͕ࠓճͷϧʔϧ

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Scheduler͕ࢦఆ͞Ε͍ͯΔ

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Sequence Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου

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Sequence Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου

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Sequence Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου on

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ͭ·Γ • Scheduler͕ࢦఆ͞Ε͍ͯΔ৔߹͸Ͳ͜Ͱ subscribeΛݺ΅͏͕ɺࢦఆ͞Εͨ Scheduler(εϨου)ͰonΛݺͿɻ

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Question4 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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֤.Next, .Completed͸ͲͷεϨουͰon͞ΕΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. ح਺͸όοΫάϥ΢ϯυεϨου ۮ਺͸ϝΠϯεϨου .Completed͸ෆఆ

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ղઆ • .Nextʹ͍ͭͯ͸౴͑͸؆୯Ͱ͕͢ɺ୭͕Ͳ͏ಈ ͍͍ͯΔͷ͔ΠϝʔδͰ͖ΔͱΑΓྑ͍ͱࢥ͍ ·͢ɻ • ͭ·ΓMergeSinkIter͕subscribeΛ͢Δ → Scheduler͕ࢦఆ͞Ε͍ͯΔͷͰͦͷεϨουͰ on͕ݺ͹Εͯobserverʹ౉͢ͱ͍͏͜ͱͰ͢ɻ

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ղઆ • .Completed͸ෆఆͰ͢ɻෳ਺ͷqueueʹ dispatch͍ͯ͠ΔͷͰɺ࠷ޙʹྲྀΕ͖ͯ ͨ.Next͕ͲͷεϨου͔ͩͬͨͰ.Completed ͕ྲྀΕͯ͘ΔεϨου͕มΘΓ·͢ɻ • ·͊ී௨͸͜Μͳ࢖͍ํ͠ͳ͍ͱ͸ࢥ͍·͢ ͕…

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Question5 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Replay͞ΕΔ.Next͸ 1. .NextΛ࠷ॳʹܭࢉͨ͠εϨου 2. subscribeͨ͠εϨου ͲͪΒͰྲྀΕͯ͘ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. subscribeͨ͠εϨου

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ղઆ • replay͸subscribe͞ΕͨεϨουͰߦΘΕ· ͢ɻ • ·͊ͦΕ͚ͩͰ͢ɻɻɻ

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(࠶ܝ) ϧʔϧͦͷ2 createܥͷOperatorʹScheduler͕ࢦ ఆ͞Ε͍ͯΔ৔߹ɺsubscribe͢Δͱͦ ͷScheduler্ͰonΛݺͿɻ ͭ·ΓɺͲͷεϨουͰsubscribe͞Ε ͔ͨ͸ؔ܎ͳ͍ɻ (௕͍)

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ObservableͱεϨουʹؔ͢Δϧʔϧ 1. ௨ৗͷColdͳOperator͸subscribe͞ΕͨεϨουͰ subscribeɺon͞ΕͨεϨουͰonΛݺͿɻಛʹ SchedulerͷࢦఆͳͲ͕ͳ͍৔߹ɺcreateܥOperator ͸subscribeͨ͠εϨουͰonΛݺͿ 2. createܥͷOperatorʹScheduler͕ࢦఆ͞Ε͍ͯΔ৔ ߹ɺsubscribe͢ΔͱͦͷScheduler্ͰonΛݺͿɻͭ ·ΓɺͲͷεϨουͰsubscribe͞Ε͔ͨ͸ؔ܎ͳ͍ɻ

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ޙฤ observeOn, subscribeOn

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observeOn, subscribeOn • ͔͜͜Β͸Scheduler(εϨου)Λมߋ͢Δͨ ΊͷOperator observeOn, subscribeOnʹͭ ͍ͯݟ͍͖ͯ·͕͢ɺ͜͜·Ͱͷ࿩͕ͳΜͱ ͳ͘ཧղͰ͖͍ͯΕ͹ಛʹ೉͘͠ͳ͍ͱࢥ͍ ·͢ɻ

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observeOn on͢ΔScheduler(εϨου)Λ มߋ͢Δ

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subscribeOn subscribe͢ΔScheduler(εϨου)Λ มߋ͢Δ

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ͦͷ··ʂʂ

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ղઆ Sequence Map Observer subscribe on ϝΠϯεϨου όοΫάϥ΢ϯυεϨου observeOn .observeOn(backgroundScheduler) subscribe subscribe on on

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ղઆ Sequence Map Observer subscribe on ϝΠϯεϨου όοΫάϥ΢ϯυεϨου observeOn .observeOn(backgroundScheduler) subscribe subscribe on on

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ղઆ Sequence Map Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribeOn .subscribeOn(backgroundScheduler) subscribe on on on subscribe

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ղઆ Sequence Map Observer subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribeOn .subscribeOn(backgroundScheduler) subscribe on on on subscribe

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observeOn • observeOnʹ͍ͭͯ͸ɺͦΕΑΓલͷจ຺ʹ ؔ܎ͳ͘࢖͑ΔͷͰɺಛʹ೉͍͜͠ͱΛߟ͑ ͣʹʮΠϕϯτ͕ྲྀΕͯ͘ΔεϨουΛม͑ ͍ͨʂʯͱ͍͏ͱ͖ʹ࢖͑Δͱࢥ͍·͢ɻ

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subscribeOn • subscribeOnʹ͍ͭͯ͸͔ͳΓ಺෦ͷಈ͖ʹ ґଘ͠·͕͢ɺཁ͸લฤͰΈͨ௨ΓͰɺͬ͟ ͘Γݴͬͯ͠·͑͹ҎԼ͸ಉ͡Ͱ͢ɻ

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subscribeOn • લͷจ຺ʹ͔ͳΓґଘ͢ΔͷͰɺͦ΋ͦ΋ subscribeOn͕ޮ͔ͳ͍͜ͱ͢Β΋͋Γ·͢ɻ • ࢖͍υίϩͱͯ͠͸ɺcreateܥͷOperatorͷ ௚ޙʹॻ͍͓͍ͯͯͦͷScheduler(εϨου) Ͱ͔͠ಈ࡞͠ͳ͍ObservableΛ࡞Δ͜ͱ͕Ͱ ͖·͢ɻ

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Question6 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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ͦΕͧΕͷMap͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. όοΫάϥ΢ϯυεϨου

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ղઆ subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribe on on on subscribe Sequence Map Observer subscribeOn Map subscribe on

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Question7 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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ͦΕͧΕͷMap͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. ϝΠϯεϨου

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ղઆ subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribe subscribe Sequence Map Observer subscribeOn Map subscribe

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ղઆ subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribe subscribe Sequence Map Observer subscribeOn Map subscribe Sequence͸MainSchedulerͰಈ࡞͢Δɻ

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ղઆ subscribe ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribe subscribe Sequence Map Observer subscribeOn Map subscribe on on on on

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Question8 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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ͦΕͧΕͷMap͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. όοΫάϥ΢ϯυεϨου

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ղઆ • (ུ)

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(࠶ܝ) observeOn on͢ΔScheduler(εϨου)Λ มߋ͢Δ

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(࠶ܝ) subscribeOn subscribe͢ΔScheduler(εϨου)Λ มߋ͢Δ

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͓·͚ Driver

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Driver • Driver͸RxCocoa͕ఏڙ͍ͯ͠ΔɺUIͱͭͳ ͛Δͱ͖ʹྑ͍ײ͡ʹ΍ͬͯ͘ΕΔศརͳ Observableతͳ͛͢ʔ΍ͭɻ(ޠኮྗ) • ࡉ͔͍ੑ࣭͸͍Ζ͍Ζ͋ΔΜͰ͕͢ɺεϨο υपΓͷੑ࣭ʹ͍ͭͯݟͯΈ·͢ɻ

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Driverͷ࡞Γํ • createܥͷOperatorΛར༻͢Δ • Observable͔Βม׵͢Δ

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createܥͷOperatorΛར༻͢Δ • Driverʹ΋ಉ͡Α͏ʹcreate, just, ofͳͲͷ Operator͕ଘࡏ͢Δɻ • ίʔυΛಡΉͱ࢓૊Έ͸؆୯ͰɺϝΠϯεϨο υͰsubscribe͕͞ΕΔΑ͏ʹsubscribeOnΛ ݺΜͰ͍Δ͜ͱ͕Θ͔Δɻ

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createܥͷOperatorΛར༻͢Δ

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Observable͔Βม׵͢Δ • asDriverͰObservableΛDriverʹͰ͖Δ • ͬͪ͜΋؆୯ͰɺobserveOnͰϝΠϯεϨο υͰಈ࡞͢ΔΑ͏ʹ͍ͯ͠Δɻ

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Observable͔Βม׵͢Δ

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drive, driveNext • Driver ʹ͸ subscribe ͕ͳ͘ɺ୯७ʹ୅ΘΓ ʹdrive΍ driveNext ͳͲΛར༻͢Δɻ • 1͚ͭͩ஫ҙ఺͕͋ͬͯɺ͜ΕΒ͸ϝΠϯε ϨουͰ͔͠ݺ΂ͳ͍ɻ

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drive, driveNext

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DriverͷOperatorʹ͍ͭͯ • mapͳͲɺ௨ৗͷOperator͸͍͍ͩͨҰ௨Γ ༻ҙ͞Ε͍ͯΔɻ • ͜ΕΒΛݺΜͰ΋ಛʹεϨουʹӨڹ͸ͳ͍ɻ • driveOnSchedulerͱ͍͏Operator͕͋Δ͕ɺ ͜Ε͸ςετ༻ͳͷͰ࢖Θͳ͍Α͏ʹɻ

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Question9 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Map͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. Τϥʔ

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ղઆ • drive͸ϝΠϯεϨου͔Β͔͠ݺ΂·ͤΜɻ (ͻ͔͚ͬʣ

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Question10 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Map͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. ϝΠϯεϨου

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ղઆ ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribe Sequence Map Observer drive on on

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Question11 Ͳ͜ͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ

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Map͸ͲͷεϨουͰಈ࡞͢ΔͰ͠ΐ͏ʁ Observerʹ͸ͲͷεϨουͰΠϕϯτ͕ಧ͘Ͱ͠ΐ͏ʁ

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Answer ਖ਼ղ͸…

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A. map͸όοΫάϥ΢ϯυ observer͸ϝΠϯ

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ղઆ ϝΠϯεϨου όοΫάϥ΢ϯυεϨου subscribe Sequence Map Observer drive on on

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͓·͚ ͦͷ2 NSURLSession+Rx

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NSURLSession+Rx • rx_response΍rx_JSON͸όοΫάϥ΢ϯυε ϨουͰonΛݺΜͰ͘ΔͷͰɺωοτϫʔΫ → UI Λ΍Δͱ͖͸ؾΛ͚ͭΑ͏ɻ

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·ͱΊ

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ObservableͱεϨουʹؔ͢Δϧʔϧ 1. ௨ৗͷColdͳOperator͸subscribe͞ΕͨεϨουͰ subscribeɺon͞ΕͨεϨουͰonΛݺͿɻಛʹ SchedulerͷࢦఆͳͲ͕ͳ͍৔߹ɺcreateܥOperator ͸subscribeͨ͠εϨουͰonΛݺͿ 2. createܥͷOperatorʹScheduler͕ࢦఆ͞Ε͍ͯΔ৔ ߹ɺsubscribe͢ΔͱͦͷScheduler্ͰonΛݺͿɻͭ ·ΓɺͲͷεϨουͰsubscribe͞Ε͔ͨ͸ؔ܎ͳ͍ɻ

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observeOn, subscribeOn 1. subscribeOn͸subscribe͢ΔScheduler(ε Ϩου)Λมߋ͢Δɻ 2. observeOn͸on͢ΔScheduler(εϨου)Λ มߋ͢Δɻ

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