[SE-0160] Limiting @objc inference

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[SE-0160] Limiting @objc inference Daiki Matsudate (@d_date) potatotips #39

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Agenda • ͱͯ΋140จࣈͰ͸πΠʔτͰ͖ͳ͍ • [SE-0160] Limiting @objc inferenceʹ͍ͭͯ ࿩͠·͢ɻ

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[SE-0160] @objcਪ࿦ͷ੍ݶ • https://github.com/apple/swift-evolution/ blob/master/proposals/0160-objc- inference.md

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@objc in Swift 3.x • Objective-CͰݺͼग़ͤΔ΋ͷʹ͍ͭͯɺSwift ଆͰ໌ࣔతʹએݴͰ͖Δ • Θ͟Θ͟@objcΛॻ͔ͳͯ͘΋͍͍Α͏ʹ ਪ࿦ͯ͘͠ΕΔ

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@objc in Swift 3.x ͷ໰୊఺ • Objective-CͰݺͼग़ͤΔ΋ͷʹ͍ͭͯɺSwift ଆͰ໌ࣔతʹએݴͰ͖Δ • Θ͟Θ͟@objcΛॻ͔ͳͯ͘΋͍͍Α͏ʹ ਪ࿦ͯ͘͠ΕΔ → ա৒Ͱ͸ʁʁ

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@objc in Swift 3.x ͷ໰୊఺ • SwiftͷΫϥε͸Objective-CͷSelectorͷিಥΛ Ҿ͖ى͕ͪ͜͠

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@objc in Swift 3.x ͷ໰୊఺ • Swift API Design GuidelineʹԊͬͯॻ͍ͯ΋ɺ Objective-CͰݺͼग़͢ͱ͖ʹ͸Objective-C Coding Guidelineʹ൓͢Δ໊લʹม׵͞Ε͕ͪɻ ಛʹɺinitializer͸ɺͦͷ໊લʹୈҰҾ਺ΛؚΊͳ ͯ͘͸͍͚ͳ͍ͷͰɺ@objc͸ඞ͚ͣͭΔ͜ͱʹ ͳΔɻ

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• SwiftίϯύΠϥ͸Objective-C Calling Convention͔ΒSwift Calling Convention΁ม׵ ͢Δ"thunk"ϝιουΛ࡞ΔͨΊɺόΠφϦαΠζ ͕૿େ͢Δɻ @objc in Swift 3.x ͷ໰୊఺

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@objc in future

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@objc in future Objective-CͰඞཁͳͱ͜Ζ͚ͩʹ@objcΛ ͚ͭΔΑ͏ʹਪ࿦ΛݮΒ͢ ʲํ਑ʳ

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Ҿ͖ଓ͖@objcΛਪ࿦͢Δ΋ͷ 1.@objcͷ͍͍ͭͯΔએݴͷΦʔόʔϥΠυͷͱ͖

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Ҿ͖ଓ͖@objcΛਪ࿦͢Δ΋ͷ 2. @objcͷ͍ͭͨϓϩτίϧͷཁ݅Λຬͨ͢ͱ͖

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Ҿ͖ଓ͖@objcΛਪ࿦͢Δ΋ͷ 3. @IBOutlet,@IBActionଐੑ͕͍͍ͭͯΔͱ͖ 4. @NSManagedଐੑ͕͍͍ͭͯΔͱ͖ Interface BuilderͱͷΠϯλϥΫγϣϯ͕ Objective-CϥϯλΠϜͰߦΘΕΔͨΊ Core DataͱͷΠϯλϥΫγϣϯ͕ Objective-CϥϯλΠϜͰߦΘΕΔͨΊ

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௥ՃͰ@objcΛਪ࿦͢Δ΋ͷ 1. @GKInspectableଐੑ͕͍͍ͭͯΔͱ͖ 2. @IBInspectableଐੑ͕͍͍ͭͯΔͱ͖ GameplayKitͱͷΠϯλϥΫγϣϯ͕ Objective-CϥϯλΠϜͰߦΘΕΔͨΊ Interface BuilderͱͷΠϯλϥΫγϣϯ͕ Objective-CϥϯλΠϜͰߦΘΕΔͨΊ

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@objcΛਪ࿦͠ͳ͘ͳΔ΋ͷ 1. dynamic

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@objcΛਪ࿦͠ͳ͘ͳΔ΋ͷ 2. NSObject༝དྷͷΫϥε NSObjectΛܧঝ͍ͯ͠ΔΫϥεͰ͋ͬͯ΋ɺ @objcͳ͠Ͱ͸Objective-C͔Βݺͼग़ͤͳ͍ɻ

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@objcΛਪ࿦͠ͳ͘ͳΔ΋ͷ 2. NSObject༝དྷͷΫϥε extensionͰ͸ɺ@objcͳ͠Ͱ͸Objective-C͔Βݺͼ ग़ͤͳ͍ɻ

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@objcMembersͷಋೖ XCTestͳͲɺΫϥεશମ͕@objcͰ͋Δ͜ͱ͕ٻΊΒ ΕΔࡍ͸ɺ@objcMembersΛ͚ͭΔ

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@objcMembersͷಋೖ @objcMembersΛ͚ͭΔΫϥε͸ɺObjecive-Cଆ Ͱ swift_objc_membersΛ͚ͭΔ

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Extensionʹ͓͚Δ@objcͷON/OFF @nonobjcΛextensionʹ͚ͭΔ͜ͱͰɺ@objcͷ ର৅֎ͱ͢Δ͜ͱ͕Ͱ͖Δɻ

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Swift 4Ҡߦͷͱ͖͸ Ͳ͏͢Ε͹͍͍ͷ…ʁ

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"Minimal" migration workﬂow

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Minimal migration workﬂow • Step 1: Swift 4ϞʔυͰɺ@objcਪ࿦͞ΕͨՕॴͷ͢΂ ͯͷܯࠂΛղফ͢Δɻ

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Minimal migration workﬂow • Step 2: SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINTΛ1ʙ3 ͷؒͷ஋ʹઃఆ͠ɺΞϓϦΛςετɻ 1.ΤϯτϦϙΠϯτ΁ͷݺग़ΛϝοηʔδͰه࿥ 2.ϩάΛͱΓɺόοΫτϨʔεΛൃߦ 3.όοΫτϨʔεͰه࿥͠ɺΫϥογϡ͠·͢ɻ

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Minimal migration workﬂow • Step 3: ͜ͷ࣌఺ͰɺSwift 4ʹҠߦՄೳɻSwift 4ΛϏϧ υ͢Δͱɺഇࢭ༧ఆͷϧʔϧʹج͍ͮͯ@objc ͕ਪଌ͞Εͨ࢒ΓͷέʔεͷObjective-CΤϯτ ϦϙΠϯτ͕࡟আ͞ΕΔɻ

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·ͱΊ • dynamic, NSObject༝དྷͷΫϥεͰ͸@objcਪ࿦ ͕͞Εͳ͘ͳΔ • @objcMembersʹΑΓclassશମʹ@objcΛదԠ Ͱ͖ΔΑ͏ʹͳΔ • @nonobjcΛextensionʹదԠ͢Δ͜ͱͰͦͷ extension͸@objcͷదԠ֎ͱ͢Δ͜ͱ͕Ͱ͖Δ

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