How to migrate to Swift 4

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How to migrate to Swift 4 Daiki Matsudate,@d_date, iOS Freelancer Distribution GeekGarage

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Daiki Matsudate,@d_date • iOS Freelancer • Supporting Realm as News Translator • Organizer of CLEM (announce later) • WWDC17 Attendee

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Daiki Matsudate,@d_date • iOS Freelancer • Supporting Realm as News Translator • Organizer of CLEM (announce later) • WWDC17 Attendee

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Agenda • How to migrate to Swift 4 using Xcode 9 Beta • [SE-0160] Limited @objc inference • [SE-0110] Distinguish between single-tuple and multiple-argument function types • Renamed some constants • Decodable

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

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

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

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

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

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• SwiftίϯύΠϥ͸Objective-C Calling Convention ͔ΒSwift Calling Convention΁ม׵͢Δ"thunk"ϝ ιουΛ࡞ΔͨΊɺόΠφϦαΠζ͕૿େ͢Δɻ @objc in Swift 3.x ͷ໰୊఺

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@objc in future

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@objc in future Objective-CͰඞཁͳͱ͜Ζ͚ͩʹ @objcΛ͚ͭΔΑ͏ʹਪ࿦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 Ϋϥεશମ͕@objcͰ͋Δ͜ͱ͕ٻΊΒΕΔࡍ͸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΂ͯͷܯࠂΛղ ফ͢Δɻ

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Minimal migration workﬂow • Step 2: SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINTΛ1ʙ3ͷؒ ͷ஋ʹઃఆ͠ɺΞϓϦΛςετɻ 1.ΤϯτϦϙΠϯτ΁ͷݺग़ΛϝοηʔδͰه࿥ 2.ϩάΛͱΓɺόοΫτϨʔεΛൃߦ 3.όοΫτϨʔεͰه࿥͠ɺΫϥογϡ͠·͢ɻ

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Minimal migration workﬂow • Step 3: ͜ͷ࣌఺ͰɺSwift 4ʹҠߦՄೳɻSwift 4ΛϏϧυ͢Δͱɺ ഇࢭ༧ఆͷϧʔϧʹج͍ͮͯ@objc͕ਪଌ͞Εͨ࢒Γͷέʔ εͷObjective-CΤϯτϦϙΠϯτ͕࡟আ͞ΕΔɻ

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Summary in @objc • dynamic, NSObject༝དྷͷΫϥεͰ͸@objcਪ࿦͕͞Ε ͳ͘ͳΔ • @objcMembersʹΑΓclassશମʹ@objcΛదԠͰ͖ΔΑ ͏ʹͳΔ • @nonobjcΛextensionʹదԠ͢Δ͜ͱͰͦͷextension͸ @objcͷదԠ֎ͱ͢Δ͜ͱ͕Ͱ͖Δ

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[SE-0110] Distinguish between single- tuple and multiple-argument function types

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[SE-0110] Distinguish between single-tuple and multiple-argument function types ●Swift 3.1 ● Swift 4Ͱมߋ

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Renamed some constants

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NSAttributedStringKey • Renamed to enum • NSFontAttributedName -> NSAttributedStringKey.font • NSParagraphStyleAttributeName -> NSAttributedStringKey.paragraphStyle

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NSAttributedStringKey let mStr = NSMutableAttributedString() mStr.addAttribute(.foregroundColor, value: UIColor.white, range: NSRange()) mStr.addAttributes([.font : UIFont()], range: NSRange())

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NSAttributedStringKey let mStr = NSMutableAttributedString() mStr.addAttribute(.foregroundColor, value: UIColor.white, range: NSRange()) mStr.addAttributes([.font : UIFont()], range: NSRange()) "

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NSAttributedStringKey let item = UIBarButtonItem() let attr = [NSAttributedStringKey.foregroundColor.rawValue : UIColor.white] item.setTitleTextAttributes(attr, for: .normal)

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NSAttributedStringKey let item = UIBarButtonItem() let attr = [NSAttributedStringKey.foregroundColor.rawValue : UIColor.white] item.setTitleTextAttributes(attr, for: .normal) #

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Structures in AVFoundation • AVLayerVideoGravityResizeAspectFill -> AVLayerVideoGravity.resizeAspectFill

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Decodable • [SE-0166] Swift Archival & Serialization

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[SE-0166] Swift Archival & Serialization • Codable (Encodable & Decodableͷtypealias)ͷಋೖ

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[SE-0166] Swift Archival & Serialization • Codable (Encodable & Decodableͷtypealias)ͷಋೖ