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[SE-0160] Limiting @objc inference
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d_date
April 13, 2017
Programming
2
2.5k
[SE-0160] Limiting @objc inference
2017/04/13(木) Potatotips #39
d_date
April 13, 2017
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Transcript
[SE-0160] Limiting @objc inference Daiki Matsudate (@d_date) potatotips #39
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Agenda • ͱͯ140จࣈͰπΠʔτͰ͖ͳ͍ • [SE-0160] Limiting @objc inferenceʹ͍ͭͯ ͠·͢ɻ
[SE-0160] @objcਪͷ੍ݶ • https://github.com/apple/swift-evolution/ blob/master/proposals/0160-objc- inference.md
@objc in Swift 3.x • Objective-CͰݺͼग़ͤΔͷʹ͍ͭͯɺSwift ଆͰ໌ࣔతʹએݴͰ͖Δ • Θ͟Θ͟@objcΛॻ͔ͳ͍͍ͯ͘Α͏ʹ ਪͯ͘͠ΕΔ
@objc in Swift 3.x ͷ • Objective-CͰݺͼग़ͤΔͷʹ͍ͭͯɺSwift ଆͰ໌ࣔతʹએݴͰ͖Δ • Θ͟Θ͟@objcΛॻ͔ͳ͍͍ͯ͘Α͏ʹ
ਪͯ͘͠ΕΔ → աͰʁʁ
@objc in Swift 3.x ͷ • SwiftͷΫϥεObjective-CͷSelectorͷিಥΛ Ҿ͖ى͕ͪ͜͠
@objc in Swift 3.x ͷ • Swift API Design GuidelineʹԊͬͯॻ͍ͯɺ
Objective-CͰݺͼग़͢ͱ͖ʹObjective-C Coding Guidelineʹ͢Δ໊લʹม͞Ε͕ͪɻ ಛʹɺinitializerɺͦͷ໊લʹୈҰҾΛؚΊͳ ͍͚ͯ͘ͳ͍ͷͰɺ@objcඞ͚ͣͭΔ͜ͱʹ ͳΔɻ
• SwiftίϯύΠϥObjective-C Calling Convention͔ΒSwift Calling Conventionม ͢Δ"thunk"ϝιουΛ࡞ΔͨΊɺόΠφϦαΠζ ͕૿େ͢Δɻ @objc in
Swift 3.x ͷ
@objc in future
@objc in future Objective-CͰඞཁͳͱ͜Ζ͚ͩʹ@objcΛ ͚ͭΔΑ͏ʹਪΛݮΒ͢ ʲํʳ
Ҿ͖ଓ͖@objcΛਪ͢Δͷ 1.@objcͷ͍͍ͭͯΔએݴͷΦʔόʔϥΠυͷͱ͖
Ҿ͖ଓ͖@objcΛਪ͢Δͷ 2. @objcͷ͍ͭͨϓϩτίϧͷཁ݅Λຬͨ͢ͱ͖
Ҿ͖ଓ͖@objcΛਪ͢Δͷ 3. @IBOutlet,@IBActionଐੑ͕͍͍ͭͯΔͱ͖ 4. @NSManagedଐੑ͕͍͍ͭͯΔͱ͖ Interface BuilderͱͷΠϯλϥΫγϣϯ͕ Objective-CϥϯλΠϜͰߦΘΕΔͨΊ Core DataͱͷΠϯλϥΫγϣϯ͕
Objective-CϥϯλΠϜͰߦΘΕΔͨΊ
ՃͰ@objcΛਪ͢Δͷ 1. @GKInspectableଐੑ͕͍͍ͭͯΔͱ͖ 2. @IBInspectableଐੑ͕͍͍ͭͯΔͱ͖ GameplayKitͱͷΠϯλϥΫγϣϯ͕ Objective-CϥϯλΠϜͰߦΘΕΔͨΊ Interface BuilderͱͷΠϯλϥΫγϣϯ͕ Objective-CϥϯλΠϜͰߦΘΕΔͨΊ
@objcΛਪ͠ͳ͘ͳΔͷ 1. dynamic
@objcΛਪ͠ͳ͘ͳΔͷ 2. NSObject༝དྷͷΫϥε NSObjectΛܧঝ͍ͯ͠ΔΫϥεͰ͋ͬͯɺ @objcͳ͠ͰObjective-C͔Βݺͼग़ͤͳ͍ɻ
@objcΛਪ͠ͳ͘ͳΔͷ 2. NSObject༝དྷͷΫϥε extensionͰɺ@objcͳ͠ͰObjective-C͔Βݺͼ ग़ͤͳ͍ɻ
@objcMembersͷಋೖ XCTestͳͲɺΫϥεશମ͕@objcͰ͋Δ͜ͱ͕ٻΊΒ ΕΔࡍɺ@objcMembersΛ͚ͭΔ
@objcMembersͷಋೖ @objcMembersΛ͚ͭΔΫϥεɺObjecive-Cଆ Ͱ swift_objc_membersΛ͚ͭΔ
Extensionʹ͓͚Δ@objcͷON/OFF @nonobjcΛextensionʹ͚ͭΔ͜ͱͰɺ@objcͷ ର֎ͱ͢Δ͜ͱ͕Ͱ͖Δɻ
Swift 4Ҡߦͷͱ͖ Ͳ͏͢Ε͍͍ͷ…ʁ
"Minimal" migration workflow
Minimal migration workflow • Step 1: Swift 4ϞʔυͰɺ@objcਪ͞ΕͨՕॴͷ͢ ͯͷܯࠂΛղফ͢Δɻ
Minimal migration workflow • Step 2: SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINTΛ1ʙ3 ͷؒͷʹઃఆ͠ɺΞϓϦΛςετɻ 1.ΤϯτϦϙΠϯτͷݺग़ΛϝοηʔδͰه 2.ϩάΛͱΓɺόοΫτϨʔεΛൃߦ
3.όοΫτϨʔεͰه͠ɺΫϥογϡ͠·͢ɻ
Minimal migration workflow • Step 3: ͜ͷ࣌ͰɺSwift 4ʹҠߦՄೳɻSwift 4ΛϏϧ υ͢Δͱɺഇࢭ༧ఆͷϧʔϧʹج͍ͮͯ@objc
͕ਪଌ͞ΕͨΓͷέʔεͷObjective-CΤϯτ ϦϙΠϯτ͕আ͞ΕΔɻ
·ͱΊ • dynamic, NSObject༝དྷͷΫϥεͰ@objcਪ ͕͞Εͳ͘ͳΔ • @objcMembersʹΑΓclassશମʹ@objcΛదԠ Ͱ͖ΔΑ͏ʹͳΔ • @nonobjcΛextensionʹదԠ͢Δ͜ͱͰͦͷ
extension@objcͷదԠ֎ͱ͢Δ͜ͱ͕Ͱ͖Δ
એ
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