Codableはイケメン / 20160616 #otemachi_swift

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Codable͜ͱ͸͡Ί by. 2017/6/16 Otemachi.swift #01 1

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takasek iOS Developer ϑϦʔϥϯε(΄΅FiNC) @takasek OSS ActionClosurable Notifwift౳ 2

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Codable introduced in WWDC2017 https://developer.apple.com/videos/play/wwdc2017/212/ 3

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Codable͸ϞςϞς ֤ॴWWDCৼΓฦΓձͰɺ୞ࠓ3೔࿈ଓͷϐοΫΞοϓه࿥थཱத 6/14 AKIBA.swift / by fromkkɹ6/15 eureka Meetup / by Muukii ɹ!ͬ͘͟Γ֓ཁ௫ΊΔࢿྉɹɹ!DecodingErrorʹ͍ͭͯৄ͍͠ 4

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վ୊ Codable͸Πέϝϯ by. 2017/6/16 Otemachi.swift #01 5

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Codable ͷΠέϝϯϙΠϯτ 4 جຊతʹ࢖͍ํ͸ ܕʹ Codable Λ͚ͭΔ͚ͩʂ 4 ͚ͩͲCustomizable 4 ͲΜͳEncoder/Decoderʹରͯ͠΋ (JSON, Plist, ·ͩݟ͵something...)࠶ར༻Մೳ 7

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ʲ༨ஊʳ Decoderͱ͍͑͹ ࣗ࡞ CSVDecoder ͷ࡞ྫ QiitaͰެ։ͯ͠·͢! 8

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Ͳ͏customizableͳͷ͔ جຊɺίϯύΠϥ͕ܕͷϝϯόΛࣗಈੜ੒ ※protocol extensionΛར༻ͯ͠Δ = ࣮૷্ॻ͖Մೳ Ωʔ໊ΛΧελϜ͍ͨ͠ʂ ! CodingKeyΛࣗલ࣮૷ σίʔυϩδοΫΛΧελϜ͍ͨ͠ʂ ! initΛࣗલ࣮૷ 9

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طଘͷSwiftͷ࢓૊ΈΛ ׆༻ͯ͠·͢Ͷʂ ͘ʙʙʙʙʙͬʂ Πέϝϯʂ! 12

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·ͩ·ͩ͋Γ·͢ CodableͷΠέϝϯϙΠϯτ 13

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͍͍ͩͨͷܕ͸Codable ͔ͩΒɺCodableͳܕͷू߹Ͱ͋Δ Ϣʔβʔఆٛܕ΋αΫοͱCodableΕΔ 14

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classͷܧঝ΋ߟྀࡁ superdecoder ͰsuperclassΛσίʔυ 15

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Date, Data ʹ͍ͭͯɺಈతʹ Encoding StrategiesΛܾΊΒΕΔ ʢ͜Ε͸JSONEncoder/Decoderͷ࿩͚ͩͲʣ 16

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Codable Philosophy͸௒Πέϝϯ 4 Error handling built-in 4 ૊Έࠐ·ΕͨΤϥʔ੍ޚ 4 Encapsulate encoding details 4 ΤϯίʔσΟϯάͷৄࡉΛΧϓηϧԽ 4 Abstract format from type 4 ந৅Խ͞ΕͨϑΥʔϚοτ 17

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Codable Philosophy͸௒Πέϝϯ 4 Error handling built-in 4 ૊Έࠐ·ΕͨΤϥʔ੍ޚ 4 Encapsulate encoding details 4 ΤϯίʔσΟϯάͷৄࡉΛΧϓηϧԽ 4 Abstract format from type 4 ந৅Խ͞ΕͨϑΥʔϚοτ 18

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Error handling built-in ᶃ ৄࡉͳΤϥʔͰσίʔυ/Τϯίʔυͷࣦഊ Λڭ͑ͯ͘ΕΔ AppleͷϓϨθϯλʔ ʮ༧ظ͠ͳ͍input͸ɺAPIมߋͳͲͰ࣌ʹΑͬͯى͜ Γ͏ΔɻͳͷͰFatalErrorʹ͸͠ͳ͍͜ͱʹܾΊͨʯ Τϥʔͷৄࡉ͸ࡢ೔ͷMuukii͞Μͷࢿྉࢀর https://speakerdeck.com/muukii0803/ decodable-pairs-taiwan 19

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Error handling built-in ᶄ SwiftͷܕγεςϜͰ͸දݱ͖͠Εͳ͍ υϝΠϯݻ༗ͷόϦσʔγϣϯΛ ΠχγϟϥΠζ࣌ʹ࣮ߦՄೳ 20

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σίʔυͷϑΣʔζ 1. σίʔυ 4 όΠτσʔλ 4 ߏ଄Λ࣋ͭόΠτσʔλ (JSON౳) 4 ܕ෇͚͞Εͨσʔλ(Swift ͷܕ) 2. όϦσʔγϣϯ 4 Domain-specific validation 4 Graph-level validation 21

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URLͷscheme͕ https Ͱ͋Δ͜ͱΛ ܕͱͯ͠ڧ੍Ͱ͖ͨʂ 23

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Codable Philosophy 4 Error handling built-in 4 ૊Έࠐ·ΕͨΤϥʔ੍ޚ 4 Encapsulate encoding details 4 ΤϯίʔσΟϯάͷৄࡉΛΧϓηϧԽ 4 Abstract format from type 4 ந৅Խ͞ΕͨϑΥʔϚοτ 24

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Protocol Orientedͳઃܭ͕Πέϝϯ 25

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ͦΜͳϓϩτίϧઃܭͷΠέϝϯͬ΀Γ ΋ͬͱৄ͘͠ޠΓ͍ͨΜͰ͕͢… !" …·ͨผͷػձʹʂ 26