iOS向けのKMP実装：SKIEの使い方

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1. iOS޲͚ͷKMP ࣮૷ Marco Valentino SKIEͷ࢖͍ํ
2. Marco Valentino ߳ߓੜ·ΕɺதࠃҭͪɺΞϝϦΧͷେֶʹߦ͖ɺ೔ຊͰब৬͠·ͨ͠ɻ ڈ೥͔ΒגࣜձࣾΏΊΈͷAndroidςοΫϦʔυͱͯ͠ಇ͍͍ͯ·͢ɻ 2020೥ͷ಄͔ΒKotlin MultiplatformΛϓϩδΣΫτʹಋೖ͠ɺͦΕҎདྷ ͜ͷςΫϊϩδʔʹऔΓ૊ΜͰ͍·͢ɻ wasabi-muffin wasabimuffin8
3. iOS ΤϯδχΞ🍎 Կਓ͍·͔͢ʁ
4. Android ΤϯδχΞ🤖 Կਓ͍·͔͢ʁ
5. Android ΤϯδχΞ ԿਓSwiftॻ͍ͨ͜ͱ ͋Γ·͔͢ʁ🎉
6. KMPΛ্ख͘ಋೖ͢ΔͨΊʹ KotlinͱSwiftͷཧղ͸๬·͍͠
7. val greeting: String = "Hello" var platform: String = "Android" let greeting: String = "Hello" var platform: String = "iOS" Variables
8. fun greet(name: String = "World"): String { return "Hello, $name" } greet() // or greet("Android") // or greet(name = "Android") func greet(name: String = "World") -> String { return ("Hello, \(name)") } greet() // or greet(name: "iOS") Functions
9. interface Platform { val version: String fun greet() } class Android(override val version: String = "14"): Platform { override fun greet() { println("Hello, Android $version”) } } val platform = Android() protocol Platform { var version: String { get } func greet() } class Ios : Platform { let version: String init(version: String = "17") { self.version = version } func greet() { print("Hello, iOS \(version)") } } let platform = Ios() Classes
10. enum class Platform { ANDOID, IOS } when (platform) { Platform.ANDROID -> println("Android") Platform.IOS -> println("iOS") } enum Platform { case android case ios } switch platform { case .android: print("Android") case .ios: print("iOS") } Enums
11. sealed class Platform { data class Android(val name: String): Platform() data class Ios(val version: Int): Platform() } when (platform) { is Platform.Android -> println(result.name) is Platform.Ios -> println(result.version) } enum Platform { case android(name: String) case ios(version: Int) } switch platform { case .android(name: let name): print(name) case .ios(version: let version): print(version) } Sealed Classes
12. suspend fun fetchData() { delay(5000) print("Complete") } runBlocking { fetchData() } func fetchData() async { try await Task.sleep(nanoseconds: 5000000000) print("Complete") } Task { await fetchData() } Concurrency
13. val flow = flowOf(1, 2, 3) runBlocking { flow.collect { println(it) } } let sequence = [1, 2, 3].publisher.values Task { for await i in sequence { print(i) } } Concurrency
14. Kotlin-Swift Interop
15. Kotlin-Swift Interop
16. fun greet(name: String = "World"): String { return "Hello, $name" } greet() // or greet(name: "iOS") Default Values ཧ૝
17. fun greet(name: String = "World"): String { return "Hello, $name" } greet() greet(name: “iOS") Default Values ཧ૝ ࣮ࡍ
18. interface Platform { val version: String fun greet() } class Android(override val version: String = "14"): Platform { override fun greet() { println("Hello, Android $version") } } let platform = Android() Default Values ཧ૝
19. interface Platform { val version: String fun greet() } class Android(override val version: String = "14"): Platform { override fun greet() { println("Hello, Android $version") } } let platform = Android() let platform = Android(version: "14") Default Values ཧ૝ ࣮ࡍ
20. enum class Platform { Android, Ios } switch platform { case .android: print("Android") case .ios: print(“iOS") } Enums ཧ૝
21. enum class Platform { Android, Ios } switch platform { case .android: print("Android") case .ios: print(“iOS") } switch platform { case .android: print("Android") case .ios: print(“iOS") default: fatalError() } Enums ཧ૝ ࣮ࡍ
22. sealed class Platform { data class Android(val name: String): Platform() data class Ios(val version: Int): Platform() } switch platform { case .android(name: let name): print(name) case .ios(version: let version): print(version) } Sealed Classes ཧ૝
23. sealed class Platform { data class Android(val name: String): Platform() data class Ios(val version: Int): Platform() } switch platform { case .android(name: let name): print(name) case .ios(version: let version): print(version) } switch platform { case let platform as Platform.Android: print(platform.name) case let platform as Platform.Ios: print(platform.version) default: fatalError() } Sealed Classes ཧ૝
24. suspend fun fetchData() { delay(5000) print("Complete") } Task { await fetchData() } Suspend ཧ૝
25. suspend fun fetchData() { delay(5000) print("Complete") } Task { await fetchData() } Task { try await fetchData() } Suspend ཧ૝ ࣮ࡍ
26. suspend fun fetchData() { delay(5000) print("Complete") } Task { await fetchData() } let task = Task { try await fetchData() } task.cancel() // Ωϟϯηϧ͞Εͳ͍ Suspend ཧ૝ ࣮ࡍ
27. val flow = flowOf(1, 2, 3) Task { for await i in flow { print(i) } } Flow ཧ૝
28. val flow = flowOf(1, 2, 3) Task { for await i in flow { print(i) } } Wrapper? Flow collector? Flow ཧ૝ ࣮ࡍ
29. Kotlin-Swift Interop ☹ Default Values, Enums, Sealed Classes, Suspend, Flow…
30. Kotlin-Swift Interop 2024?
31. SKIE https://skie.touchlab.co/ By TouchLabs
32. SKIE Setup plugins { id("co.touchlab.skie") version "0.5.6" } ... sourceSets { val commonMain by getting { dependencies { implementation( "co.touchlab.skie:configuration-annotations:0.5.6" ) } } } shared/build.gradle.kts
33. fun greet(name: String = "World"): String { return "Hello, $name" } greet() // or greet(name: “iOS") Default Values ཧ૝ ࣮ࡍ
34. @DefaultArgumentInterop.Enabled fun greet(name: String = "World"): String { return "Hello, $name" } greet() // or greet(name: “iOS") Default Values ཧ૝ ࣮ࡍ
35. @DefaultArgumentInterop.Enabled fun greet(name: String = "World"): String { return "Hello, $name" } greet() // or greet(name: “iOS") Default Values ཧ૝
36. interface Platform { val version: String fun greet() } class Android(override val version: String = "14"): Platform { override fun greet() { println("Hello, Android $version") } } let platform = Android() let platform = Android(version: "14") Default Values ཧ૝ ࣮ࡍ
37. interface Platform { val version: String fun greet() } class Android @DefaultArgumentInterop.Enabled constructor( override val version: String = "14" ) : Platform { override fun greet() { println("Hello, Android $version") } } let platform = Android() let platform = Android(version: "14") Default Values ཧ૝ ࣮ࡍ
38. interface Platform { val version: String fun greet() } class Android @DefaultArgumentInterop.Enabled constructor( override val version: String = "14" ) : Platform { override fun greet() { println("Hello, Android $version") } } let platform = Android() let platform = Android(version: "14") Default Values ཧ૝
39. enum class Platform { Android, Ios } switch platform { case .android: print("Android") case .ios: print(“iOS") } switch platform { case .android: print("Android") case .ios: print(“iOS") default: fatalError() } Enums ཧ૝ ࣮ࡍ
40. enum class Platform { Android, Ios } switch platform { case .android: print("Android") case .ios: print(“iOS") } Enums ཧ૝
41. sealed class Platform { data class Android(val name: String): Platform() data class Ios(val version: Int): Platform() } switch platform { case .android(name: let name): print(name) case .ios(version: let version): print(version) } switch platform { case let platform as Platform.Android: print(platform.name) case let platform as Platform.Ios: print(platform.version) default: fatalError() } Sealed Classes ཧ૝ ࣮ࡍ
42. sealed class Platform { data class Android(val name: String): Platform() data class Ios(val version: Int): Platform() } switch onEnum(of: platform) { case .android(name: let name): print(name) case .ios(version: let version): print(version) } switch platform { case let platform as Platform.Android: print(platform.name) case let platform as Platform.Ios: print(platform.version) default: fatalError() } Sealed Classes ཧ૝ ࣮ࡍ
43. sealed class Platform { data class Android(val name: String): Platform() data class Ios(val version: Int): Platform() } switch onEnum(of: platform) { case .android(name: let name): print(name) case .ios(version: let version): print(version) } Sealed Classes ཧ૝
44. suspend fun fetchData() { delay(5000) print("Complete") } Task { await fetchData() } let task = Task { try await fetchData() } task.cancel() // Ωϟϯηϧ͞Εͳ͍ Suspend ཧ૝ ࣮ࡍ
45. suspend fun fetchData() { delay(5000) print("Complete") } Task { await fetchData() } let task = Task { try await fetchData() } task.cancel() // Ωϟϯηϧ͞ΕΔΑ͏ʹͳΔ Suspend ཧ૝ ࣮ࡍ
46. val flow = flowOf(1, 2, 3) Task { for await i in flow { print(i) } } Wrapper? Flow collector? Flow ཧ૝ ࣮ࡍ
47. val flow = flowOf(1, 2, 3) Task { for await i in flow { print(i) } } Flow ཧ૝
48. SKIE Interop ☹ Default Values, Enums, Sealed Classes, Suspend, Flow…
49. SKIE Interop Default Values, Enums, Sealed Classes, Suspend, Flow SKIE ☺
50. SKIE Interop ☺ Default Values, Enums, Sealed Classes, Suspend, Flow SKIE Generics, Exceptions, Names, Interfaces… ☹
51. Kotlin Docs: Native Objc Interop https://kotlinlang.org/docs/native-objc-interop.html Writing Swift Friendly KMP Apis https://medium.com/@aoriani/list/writing-swiftfriendly-kotlin-multiplatform-apis-c51c2b317fce Kotlin-Swift Interopedia https://github.com/kotlin-hands-on/kotlin-swift-interopedia KMP for iOS developers: state & future by Salomon Brys https://kotlinconf.com/2023/talks/387260/ Kotlin Multiplatform Mobile for Teams by Kevin Gilligan https://kotlinconf.com/2023/talks/391895/ Kotlin to Swift Transformations | SKIE Live Demo & QA https://www.youtube.com/watch?v=GK8lJq2Z76Y iOS Development With Kotlin Multiplatform: Tips and Tricks https://www.youtube.com/watch?v=eFzy1BRtHps Extra Resources
52. ͝ਗ਼ௌ͋Γ͕ͱ͏ ͍͟͝·ͨ͠
53. https://icons8.com/icon/ZoxjA0jZDdFZ/kotlin https://icons8.com/icon/24465/swift https://seeklogo.com/vector-logo/340070/objective-c Licenses