Protocols in Swift - Speaker Deck

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Protocols in Swift Speee Engineer Meeting 2016-08-31 @hiragram

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SlackͷMac༻ΞϓϦ ॏ͘ͳ͍Ͱ͔͢ʁ

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• ͜ΜͳΞϓϦΛ࡞ͬ ͍ͯΔதͰߟ͑ͨ͜ ͱΛ͠Ό΂Γ·͢

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࿩͢͜ͱ • ܧঝͭΒ͍ • Swiftͷϓϩτίϧʹ͍ͭͯ • ϓϩτίϧ͚ͩͰ݁߹ͨ͠ੈք • ϓϩτίϧ֦ு

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ܧঝͭΒ͍ • Apple੡ͷϑϨʔϜϫʔΫ ͸ܧঝࡇΓ • શͯͷΫϥε͸NSObject ͷαϒΫϥε • ʮ͋ͷϝιουͬͯͲ͜ʹ ࣮૷͞Ε͚ͯͨͬʁʯ

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ܧঝͭΒ͍ • UIViewControllerͷloadViewϝιου • ʮInterfaceBuilder࢖͏ͳΒΦʔόʔϥΠυ͠ ͪΌμϝʯ

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ܧঝͭΒ͍ • KVO(Ωʔ஋؂ࢹ)Ͱ࢖͏observeValueForKeyPathϝιου • ʮ਌ΫϥεͷΛݺͿͱ͖͸ͪΌΜͱ࣮૷͞ΕͯΔ͔͔֬Ίͯ Ͷʯ

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ͳʹͦΕ͸

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ϓϩτίϧࢦ޲ϓϩάϥϛϯά • ෳ਺Ϋϥεʹ·͕ͨͬͯ͋Δੑ࣭/ػೳΛ͍࣋ͨͤͨ ͱ͖͸ɺܧঝʹΑͬͯͰ͸ͳ͘ɺϓϩτίϧʹΑͬͯ ࣮ݱ͠·͠ΐ͏ɻ(BaseViewControllerͱ͔ͭΒ͍) • ܧঝ͸Ұͭͷ਌͔࣋ͯ͠ͳ͍͕ɺϓϩτίϧͳΒෳ਺ ࣋ͯͯ͏Ε͍͠ɻ • ෳ਺࣋ͯΔ͕ɺෳ਺ͷϓϩτίϧͰ໊લ͕িಥ͢Δ ͱશͯʹద߹Ͱ͖͍ͯͳ͍ͱ͍͏͜ͱͰίϯύΠϧ ௨Βͳ͍ɻ͜Ε͸ෆՄආɻ

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Swiftͷϓϩτίϧ • Property / Method Requirements • ࣮૷Λڧ੍͢Δ • Associatedtype • ϓϩτίϧ಺Ͱར༻͢Δɺؔ࿈͢Δܕ • Protocol Extension • ޙड़

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ม਺ͷܕΛϓϩτίϧͰଋറ͢Δ

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ม਺ͷܕΛϓϩτίϧͰଋറ͢Δ • a͸ʮAwesomeProtocolʹ४ڌͯ͠ΔܕͷΦϒ δΣΫτ͸ԿͰ΋ಥͬࠐΊΔʯ • b͸ʮAwesomeProtocolʹ४ڌ͍ͯ͠Δͻͱͭͷ ܕͷΦϒδΣΫτ͚ͩಥͬࠐΊΔʯ • ܕਪ࿦ͷ͓͔͛ͰδΣωϦΫεͱͯ΋࢖͍΍͍͢

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ࣗ࡞SlackΞϓϦͰ΍ͬͯΔ͜ͱ • ςʔϒϧʹදࣔ͢ΔϝοηʔδͷܕΛ௚઀ࢦఆ͠ ͍͕ͯͨɺϑΟʔυʹදࣔ͢ΔΠϕϯτ༻ͷϓϩ τίϧΛ࡞ͬͨ → ϝοηʔδҎ֎ͷΠϕϯτ΋ ؆୯ʹදࣔͰ͖ΔΑ͏ʹͳͬͨ

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௚઀ܕʹ݁߹ͨ͠ੈք 7JFX$POUSPMMFS .FTTBHF&OUJUZ

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௚઀ܕʹ݁߹ͨ͠ੈք 7JFX$POUSPMMFS ❗

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਌Ϋϥεʹ݁߹ͨ͠ੈք 7JFX$POUSPMMFS ͳΜͨΒ .FTTBHF&OUJUZ

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਌Ϋϥεʹ݁߹ͨ͠ੈք 7JFX$POUSPMMFS ❗ ͳΜͨΒ .FTTBHF&OUJUZ

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ϓϩτίϧ͚ͩͰ݁߹ͨ͠ੈք 7JFX$POUSPMMFS .FTTBHF&OUJUZ "XFTPNF1SPUPDPM

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ϓϩτίϧ͚ͩͰ݁߹ͨ͠ੈք 7JFX$POUSPMMFS "XFTPNF1SPUPDPM

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ϓϩτίϧ͚ͩͰ݁߹ͨ͠ੈք 7JFX$POUSPMMFS "XFTPNF1SPUPDPM ผͷ&OUJUZ

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ϓϩτίϧ͚ͩͰ݁߹ͨ͠ੈք ͷ޾ͤͳͱ͜Ζ • ݺͼग़͠ଆ(͖ͬ͞ͷྫͰ͸ViewController)͕஌ͬ ͍ͯΔϝιου͕ݶఆ͞ΕΔ • ʮ͜ͷϝιου௚ͦ͏ͱࢥ͚ͬͨͲɺ૝ఆ֎ͷॴ͔ Βݺ͹Εͯͯม͑ΒΕͳ͍ʯΛ(͋Δఔ౓)ճආͰ͖ Δ • ϓϩτίϧʹద߹͍ͯ͑͠͞Ε͹͍͍ͷͰɺଞͷܕ ͱೖΕସ͑ͨΓ৽͘͠௥Ճͨ͠Γ͢Δͷָ͕͍͢͝

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ϓϩτίϧ͚ͩͰ݁߹ͨ͠ੈք ͷͭΒ͍ͱ͜Ζ • ܕΛࢦఆͯ͠ಈ͘ͱ͖ΑΓϓϩτίϧ͔ΒΠϯελ ϯεʹΞΫηε͢Δͱ͖ॲཧ͕஗͍ • Xcodeͷʮఆٛ΁δϟϯϓʯ͕ͪΐͬͱෆศʹͳΔ • ϓϩτίϧ͕ཚཱͯ͘͠Δͱ໊લͱ͔ͪΌΜͱ෇͚ ͓͔ͯͳ͍ͱޙͰۤͦ͠͏ʁ • delegateͷதͰ͞Βʹdelegateͱ͔΍ͬͯΔͱΧ Φε

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ϓϩτίϧ֦ு • Swift2͔Β௥Ճ͞Εͨϓϩτίϧ֦ு(Protocol Extension) • ࣮૷Λڧ੍͢ΔProtocolʹରͯ͠ɺσϑΥϧτ ͷ࣮૷ΛఆٛͰ͖Δɻ

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femitΞϓϦʹ Ұॠ͋ͬͨίʔυ

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ϓϩτίϧ֦ுΛ࢖͏ͱ • σϑΥϧτ࣮૷͚ͩͰ͍͍࣌͸ɺܕͷఆٛʹϓ ϩτίϧ໊Λॻ͖଍͚ͩ͢Ͱͦͷϓϩτίϧʹ ద߹Ͱ͖Δɻָɻ • ͋Δಛఆͷܕʹରͯ͠ϓϩτίϧ੍໿Λ͚ͭΔ ͱ͖͚ͩར༻ՄೳͳσϑΥϧτ࣮૷ΛఆٛͰ͖ Δ

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·ͱΊ • ݺͼग़͠ݩ͔Βݟ͑Δൣғ͕ݶఆͰ͖Δͷྑ͍ • δΣωϦΫε+ܕਪ࿦ͰΧνοͱ͍͔ͯͯͭ͠ίʔ υ͸ॻ͖΍͍͢ • ܧঝͭΒ͍ • ࢀরܕͭΒ͍ͱ͍͏จ຺ͱ߹ΘͤͯΫϥεͰ͸ͳ ͘஋ܕͰܧঝͰ͖ͳ͍ߏ଄ମΛ࢖͓͏ͥΈ͍ͨͳ ෩ை͕͋Δ

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͓ΘΓ