kmp-iosmeetup.pdf

Overview of Kotlin Multiplatform for the iOSoho meetup in NYC

Transcript

1. Kotlin Multiplatform For iOS Kevin Galligan
3. Touchlab
4. Community community!
6. Multiplatform Ambassador (unofficial) http://talkingkotlin.com/
7. What is Kotlin Multiplatform?
8. kot·lin mul·ti·plat·form /ˌkätˈlin məltiˈplatfôrm,ˌkätˈlin məltīˈplatfôrm/ noun noun: kotlin multiplatform 1.optional, natively-integrated, open-source, code sharing platform, based on the popular, modern language kotlin. facilitates non-ui logic availability on many platforms.
9. Optional Sharing Low risk. No Big Decisions.
10. Natively Integrated smooth interop
11. open source
12. Code Sharing not “cross platform”
13. popular
14. popular
15. popular
16. language & tools
17. modern
18. Not UI well, not necessarily UI
19. Shared UI == Failure!
20. Shared Logic == Computers
21. Many Platforms
22. Kotlin
23. Kotlin JVM
24. Kotlin JVM JS
25. Kotlin JVM JS Native
26. Kotlin JVM JS Native iOS Mac Linux Windows Android/NDK Others…
27. Kotlin JVM JS Native iOS Mac Linux Windows Android/NDK Others… Webassembly
28. Kotlin JVM JS Native iOS Mac Linux Windows Android/NDK Others… Webassembly Many Platforms
29. Why Kotlin? High Efficiency Low Risk Modern Language/Tools Highly Engaged Community
30. mobile is easy
31. mobile is easy
32. Status
33. Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9.3 IDE tooling! Coroutines?
34. Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9.3 IDE tooling! Coroutines? K/N 1.0, Kotlin 1.3 Gradle 4.10+
35. Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9.3 IDE tooling! Coroutines? K/N 1.0, Kotlin 1.3 Gradle 4.10+ K/N 1.1, Kotlin 1.3.20 Community Libraries Big Co Support
36. Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9.3 IDE tooling! Coroutines? K/N 1.0, Kotlin 1.3 Gradle 4.10+ K/N 1.1, Kotlin 1.3.20 Community Libraries Big Co Support MT Coroutines Improved tooling
37. Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9.3 IDE tooling! Coroutines? K/N 1.0, Kotlin 1.3 Gradle 4.10+ K/N 1.1, Kotlin 1.3.20 Community Libraries Big Co Support MT Coroutines Improved tooling Reactive Library Big Prod Apps “Mainstream”
38. TL;DR March start getting real end of Q1
39. SHARED CODE FOR ANDROID & IOS
40. Common
41. Common mainThread?
42. expect val mainThread:Boolean
43. expect val mainThread:Boolean actual val mainThread: Boolean get() = Looper.myLooper() === Looper.getMainLooper()
44. expect val mainThread:Boolean actual val mainThread: Boolean get() = Looper.myLooper() === Looper.getMainLooper() actual val mainThread: Boolean get() = NSThread.isMainThread()
45. expect val mainThread:Boolean actual val mainThread: Boolean get() = Looper.myLooper() === Looper.getMainLooper() actual val mainThread: Boolean get() = NSThread.isMainThread() actual val mainThread: Boolean = true
46. expect fun currentTimeMillis():Long expect fun <B> backgroundTask(backJob:()-> B, mainJob:(B) -> Unit) expect fun backgroundTask(backJob:()->Unit) expect fun networkBackgroundTask(backJob:()->Unit) expect fun initContext():NativeOpenHelperFactory expect fun <T> goFreeze(a:T):T expect fun <T> T.freeze2(): T expect fun simpleGet(url:String):String expect fun logException(t:Throwable) expect fun settingsFactory(): Settings.Factory expect fun createUuid():String
47. expect class Date { fun toLongMillis():Long } expect class DateFormatHelper(format:String){ fun toDate(s:String):Date fun format(d:Date):String }
48. actual class Date(val iosDate:NSDate) { actual fun toLongMillis():Long{ return floor(iosDate.timeIntervalSince1970).toLong() * 1000L } } actual class DateFormatHelper actual constructor(format:String){ val formatter:NSDateFormatter init { formatter = NSDateFormatter() formatter.dateFormat = format } actual fun toDate(s:String):Date = Date(formatter.dateFromString(s)!!) actual fun format(d:Date):String = formatter.stringFromDate(d.iosDate) }
49. fun initPlatformClient( staticFileLoader: (filePrefix: String, fileType: String) -> String?, analyticsCallback: (name: String, params: Map<String, Any>) -> Unit, clLogCallback: (s: String) -> Unit) {
50. fun initPlatformClient( staticFileLoader: (filePrefix: String, fileType: String) -> String?, analyticsCallback: (name: String, params: Map<String, Any>) -> Unit, clLogCallback: (s: String) -> Unit) { AppContext.initPlatformClient ({filePrefix, fileType -> loadAsset("${filePrefix}.${fileType}")}, {name: String, params: Map<String, Any> -> val event = CustomEvent(name) //Loop Answers.getInstance().logCustom(event) }, { Log.w("MainApp", it) })
51. let appContext = AppContext() appContext.doInitPlatformClient(staticFileLoader: loadAsset, analyticsCallback: analyticsCallback, clLogCallback: csLog) func loadAsset(filePrefix:String, fileType:String) -> String?{ do{ let bundleFile = Bundle.main.path(forResource: filePrefix, ofType: fileType) return try String(contentsOfFile: bundleFile!) } catch { return nil } }
52. interface SessionDetailsView : BaseView { fun updateView(isFavorite: Boolean, session: SessionModel) fun setupRatingButtons(rating: SessionRating?) fun setRatingClickable(clickable: Boolean) }
53. interface SessionDetailsView : BaseView { fun updateView(isFavorite: Boolean, session: SessionModel) fun setupRatingButtons(rating: SessionRating?) fun setRatingClickable(clickable: Boolean) }
54. Common
55. JVM Native Common
56. JVM Native Common Framework
57. JVM Native Common Framework
58. JVM Native Common Android Stuff Framework iOS Stuff
59. OK, and?!
60. Industry Level for everybody
61. Platform Consolidation
63. Mobile Needs An Answer everything is mobile
64. #postplatform all the same shit
65. Mobile Oriented Architecture (MOA)
66. ?
67. Personal Level for you, specifically
69. “…upstart skills like Kotlin are also in high demand”
70. Future Proof relevant for the next decade +
71. Libraries! Libraries! Libraries!
72. great time to start
73. Jetbrains • Ktor • Kotlinx.Coroutines • Kotlinx.io • Kotlinx.serialization • Atomic-fu (maybe?)
74. Community • Sqldelight • Knarch.db • Multiplatform Settings • Stately • OKIO2 (developing) • Timber (sort of)
75. Getting Started
76. Join Kotlin Slack https://slack.kotlinlang.org
77. Sample Apps the conference apps
79. https://github.com/touchlab/DroidconKotlin/
80. iOS Specific Instructions look for ‘IOSDEV.md’
81. kevin@touchlab.co @kpgalligan