How to migrate to Swift 4

Transcript

1. How to migrate to Swift 4 Daiki Matsudate,@d_date, iOS Freelancer

   Distribution GeekGarage

2. Daiki Matsudate,@d_date • iOS Freelancer • Supporting Realm as News

   Translator • Organizer of CLEM (announce later) • WWDC17 Attendee

3. Daiki Matsudate,@d_date • iOS Freelancer • Supporting Realm as News

   Translator • Organizer of CLEM (announce later) • WWDC17 Attendee

4. 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

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

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

   ΕΔ

7. @objc in Swift 3.x ͷ໰୊఺ • Objective-CͰݺͼग़ͤΔ΋ͷʹ͍ͭͯɺSwiftଆͰ໌ࣔత ʹએݴͰ͖Δ • Θ͟Θ͟@objcΛॻ͔ͳͯ͘΋͍͍Α͏ʹ

   ਪ࿦ͯ͘͠ ΕΔ → ա৒Ͱ͸ʁʁ

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

9. • 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໰୊఺

10. • SwiftίϯύΠϥ͸Objective-C Calling Convention ͔ΒSwift Calling Convention΁ม׵͢Δ"thunk"ϝ ιουΛ࡞ΔͨΊɺόΠφϦαΠζ͕૿େ͢Δɻ @objc in

    Swift 3.x ͷ໰୊఺

11. @objc in future

12. @objc in future Objective-CͰඞཁͳͱ͜Ζ͚ͩʹ @objcΛ͚ͭΔΑ͏ʹਪ࿦ΛݮΒ͢ ʲํ਑ʳ

13. Ҿ͖ଓ͖@objcΛਪ࿦͢Δ΋ͷ 1.@objcͷ͍͍ͭͯΔએݴͷΦʔόʔϥΠυͷͱ͖

14. Ҿ͖ଓ͖@objcΛਪ࿦͢Δ΋ͷ 2. @objcͷ͍ͭͨϓϩτίϧͷཁ݅Λຬͨ͢ͱ͖

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

    Objective-CϥϯλΠϜͰߦΘΕΔͨΊ

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

17. @objcΛਪ࿦͠ͳ͘ͳΔ΋ͷ 1. dynamic

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

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

20. @objcMembersͷಋೖ Ϋϥεશମ͕@objcͰ͋Δ͜ͱ͕ٻΊΒΕΔࡍ͸ɺ @objcMembersΛ͚ͭΔ

21. @objcMembersͷಋೖ @objcMembersΛ͚ͭΔΫϥε͸ɺObjecive-Cଆ Ͱ swift_objc_membersΛ͚ͭΔ

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

23. Swift 4Ҡߦͷͱ͖͸ Ͳ͏͢Ε͹͍͍ͷ…ʁ

24. "Minimal" migration workflow!

25. Minimal migration workflow • Step 1: Swift 4ϞʔυͰɺ@objcਪ࿦͞ΕͨՕॴͷ͢΂ͯͷܯࠂΛղ ফ͢Δɻ

26. Minimal migration workflow • Step 2: SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINTΛ1ʙ3ͷؒ ͷ஋ʹઃఆ͠ɺΞϓϦΛςετɻ 1.ΤϯτϦϙΠϯτ΁ͷݺग़ΛϝοηʔδͰه࿥ 2.ϩάΛͱΓɺόοΫτϨʔεΛൃߦ

    3.όοΫτϨʔεͰه࿥͠ɺΫϥογϡ͠·͢ɻ

27. Minimal migration workflow • Step 3: ͜ͷ࣌఺ͰɺSwift 4ʹҠߦՄೳɻSwift 4ΛϏϧυ͢Δͱɺ ഇࢭ༧ఆͷϧʔϧʹج͍ͮͯ@objc͕ਪଌ͞Εͨ࢒Γͷέʔ

    εͷObjective-CΤϯτϦϙΠϯτ͕࡟আ͞ΕΔɻ

28. Summary in @objc • dynamic, NSObject༝དྷͷΫϥεͰ͸@objcਪ࿦͕͞Ε ͳ͘ͳΔ • @objcMembersʹΑΓclassશମʹ@objcΛదԠͰ͖ΔΑ ͏ʹͳΔ

    • @nonobjcΛextensionʹదԠ͢Δ͜ͱͰͦͷextension͸ @objcͷదԠ֎ͱ͢Δ͜ͱ͕Ͱ͖Δ

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

30. [SE-0110] Distinguish between single-tuple and multiple-argument function types •Swift 3.1

    • Swift 4Ͱมߋ

31. Renamed some constants

32. NSAttributedStringKey • Renamed to enum • NSFontAttributedName -> NSAttributedStringKey.font •

    NSParagraphStyleAttributeName -> NSAttributedStringKey.paragraphStyle

33. NSAttributedStringKey let mStr = NSMutableAttributedString() mStr.addAttribute(.foregroundColor, value: UIColor.white, range: NSRange())

    mStr.addAttributes([.font : UIFont()], range: NSRange())

34. NSAttributedStringKey let mStr = NSMutableAttributedString() mStr.addAttribute(.foregroundColor, value: UIColor.white, range: NSRange())

    mStr.addAttributes([.font : UIFont()], range: NSRange()) "

35. NSAttributedStringKey let item = UIBarButtonItem() let attr = [NSAttributedStringKey.foregroundColor.rawValue :

    UIColor.white] item.setTitleTextAttributes(attr, for: .normal)

36. NSAttributedStringKey let item = UIBarButtonItem() let attr = [NSAttributedStringKey.foregroundColor.rawValue :

    UIColor.white] item.setTitleTextAttributes(attr, for: .normal) #

37. Structures in AVFoundation • AVLayerVideoGravityResizeAspectFill -> AVLayerVideoGravity.resizeAspectFill

38. Decodable • [SE-0166] Swift Archival & Serialization

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

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

41. Himotoki

42. Himotoki

43. Decodable

44. Decodable -> Himotoki.Decodable

45. None
46. None

47. GEEK GARAGE