iOS Architecture with Multiplatform

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iOS Architecture with Multiplatform Kevin Galligan

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Touchlab

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Community community!

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2016

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Doppl

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JRE  (lang, io, util, etc) J2ObjC JRE JUnit Mockito

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JRE  (lang, io, util, etc) Android  (Context, SQLiteDatabase, Threading, Shared Preferences) J2ObjC Doppl JRE JUnit Mockito

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JRE  (lang, io, util, etc) Android  (Context, SQLiteDatabase, Threading, Shared Preferences) Gradle Plugin Library Format Testing Support Xcode Support J2ObjC Doppl JRE JUnit Mockito

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JRE  (lang, io, util, etc) Android  (Context, SQLiteDatabase, Threading, Shared Preferences) Gradle Plugin Library Format Retroﬁt RxJava RxAndroid Gson Dagger SQLDelight Room DB Android Architecture etc… Testing Support Xcode Support J2ObjC Doppl JRE JUnit Mockito

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Fractivities Architecture Components Looper, Handler, Message Queue Retroﬁt SQLite  (Room, etc) java.io.File Android Android Native Stuﬀ

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Fractivities Architecture Components Looper, Handler, Message Queue Retrofit SQLite  (Room, etc) java.io.File Android Android Native Stuff ViewControllers Architecture Components Looper, Handler, Message Queue Retrofit SQLite  (Room, etc) java.io.File iOS iOS Native Stuff

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no thanks

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https://medium.com/@kpgalligan/the-future-of-shared-code-is-kotlin-multiplatform-9aac94517f95

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I approve!

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still no thanks

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swift is life!!!

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the future? now

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reach out for repos

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chief hacking officer

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kotlin

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kotlin

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SHARED ARHICTECTURE

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Mobile & Web Architecture, not UI

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Shared UI == Failure!

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Shared Loigc == Computers

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Web is more difficult No SQL :(

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Advocate for new standards AKA The Long Game

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mobile is MUCH simpler

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DROIDCON WITH KOTLIN MULTIPLATFORM

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Funky Code Testbed

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Funky Code Testbed Kotlin in 2014!

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Droidcon NYC & SF

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Droidcon NYC & SF KotlinConf fork, but use the official :)

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SQLite Knarch.db Android iOS

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SQLite Knarch.db SQLDelight Android iOS

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SQLite Knarch.db SQLDelight Logic! Reactive (LiveData) Android iOS

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SQLite Knarch.db SQLDelight Logic! Reactive (LiveData) Android iOS

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SQLite Knarch.db SQLDelight MP Settings Logic! Reactive (LiveData) Android iOS

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val evenLiveData:EventLiveData init { val query = goFreeze(AppContext.dbHelper. queryWrapper.sessionQueries. sessionById(sessionId)) evenLiveData = EventLiveData(query) } fun shutDown(){ evenLiveData.removeListener() }

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override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { eventViewModel.eventModel.evenLiveData. observe(viewLifecycleOwner, Observer { dataRefresh(it) }) return initView(inflater, container) }

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fun registerForChanges(proc:(sessionInfo:SessionInfo)->Unit){ eventObserver = object : Observer{ override fun onChanged(t: SessionInfo?){ if(t != null) proc(t) } } eventModel.evenLiveData.observeForever(eventObserver!!) }

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viewModel = EventViewModel(sessionId: sessionId) viewModel.registerForChanges(proc: updateUi)

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viewModel = EventViewModel(sessionId: sessionId) viewModel.registerForChanges(proc: updateUi) func updateUi(sessionInfo:SessionInfo) -> KotlinUnit{ self.sessionInfo = sessionInfo styleButton() updateAllUi() return KotlinUnit() }

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Droidcon App Kotlin Multiplatform https://www.youtube.com/watch?v=YAeDK3Ei0Lk https://github.com/touchlab/DroidconKotlin/ Now with 0.9.3!

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KOTLINCONF WITH KOTLIN MULTIPLATFORM (OBV)

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Settings Android iOS Ktor

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Settings Android iOS Ktor DataRepository

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Settings Android iOS Ktor DataRepository SessionDetailsPresenter

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Settings Android iOS Ktor DataRepository SessionDetailsPresenter SessionDetailsView

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interface SessionDetailsView : BaseView { fun updateView(isFavorite: Boolean, session: SessionModel) fun setupRatingButtons(rating: SessionRating?) fun setRatingClickable(clickable: Boolean) } override fun updateView(isFavorite: Boolean, session: SessionModel) { collapsingToolbar.title = session.title speakersTextView.text = session.speakers.joinToString(separator = ", ") { it.fullName } timeTextView.text = session.timeString detailsTextView.text = listOfNotNull(session.roomText, session.category).joinToString(", ") descriptionTextView.text = session.descriptionText val online = context?.let { it.isConnected?.and(!it.isAirplaneModeOn) } ?: false for (button in listOf(votingButtonsLayout, favoriteButton)) { func updateView(isFavorite: Bool, session: SessionModel) { titleLabel.text = session.title let startsAt = session.startsAt let endsAt = session.endsAt if (startsAt != nil && endsAt != nil) { timeLabel.text = KotlinPair(first: startsAt, second: endsAt).toReadableString() } let image = UIImage(named: isFavorite ? "star_full" : "star_empty")! favoriteButton.image = image

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Settings Android iOS Ktor DataRepository SessionDetailsPresenter SessionDetailsView

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KotlinConf App https://github.com/JetBrains/kotlinconf-app

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SHARED CODE FOR ANDROID & IOS

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Common

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Common mainThread?

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expect val mainThread:Boolean

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expect val mainThread:Boolean actual val mainThread: Boolean get() = Looper.myLooper() === Looper.getMainLooper()

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expect val mainThread:Boolean actual val mainThread: Boolean get() = Looper.myLooper() === Looper.getMainLooper() actual val mainThread: Boolean get() = NSThread.isMainThread()

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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

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expect fun currentTimeMillis():Long expect fun backgroundTask(backJob:()-> B, mainJob:(B) -> Unit) expect fun backgroundTask(backJob:()->Unit) expect fun networkBackgroundTask(backJob:()->Unit) expect fun initContext():NativeOpenHelperFactory expect fun goFreeze(a:T):T expect fun T.freeze2(): T expect fun simpleGet(url:String):String expect fun logException(t:Throwable) expect fun settingsFactory(): Settings.Factory expect fun createUuid():String

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expect class Date { fun toLongMillis():Long } expect class DateFormatHelper(format:String){ fun toDate(s:String):Date fun format(d:Date):String }

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actual class Date(val date:java.util.Date) { actual fun toLongMillis(): Long = date.time } actual class DateFormatHelper actual constructor(format: String) { val dateFormatter = object : ThreadLocal(){ override fun initialValue(): DateFormat = SimpleDateFormat(format) } actual fun toDate(s: String): Date = Date(dateFormatter.get()!!.parse(s)) actual fun format(d: Date): String = dateFormatter.get()!!.format(d.date) }

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fun initPlatformClient( staticFileLoader: (filePrefix: String, fileType: String) -> String?, analyticsCallback: (name: String, params: Map) -> Unit, clLogCallback: (s: String) -> Unit) {

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fun initPlatformClient( staticFileLoader: (filePrefix: String, fileType: String) -> String?, analyticsCallback: (name: String, params: Map) -> Unit, clLogCallback: (s: String) -> Unit) { AppContext.initPlatformClient ({filePrefix, fileType -> loadAsset("${filePrefix}.${fileType}")}, {name: String, params: Map -> val event = CustomEvent(name) //Loop Answers.getInstance().logCustom(event) }, { Log.w("MainApp", it) })

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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 } }

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Common

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JVM Native Common

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JVM Native Common Framework

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JVM Native Common Framework

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JVM Native Common Android Stuff Framework iOS Stuff

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JVM Native Common

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JVM Native Common Ktor-JVM Ktor-Native Ktor

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iOS Dev Info

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Reference Counting but not your reference counting

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No Reference Cycles

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Can call from Swift although some complaints

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No bitcode support yet…

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Threading is Different that’s for everybody

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https://medium.com/@kpgalligan/kotlin-native-stranger-threads-c0cf0e0fb847

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Episode 2 soon!

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IDE TOOLS & GRADLE PLUGINS

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¯\_(ツ)_/¯

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Multiplatform IDE Intellij community and Android Studio!

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Multiplatform Gradle new and changing

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Other Plugins?

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LIBRARIES

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Stdlib not exactly a library, but…

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Kotlin/Native Runtime also not a library, still… https://github.com/JetBrains/kotlin-native

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• kotlin/native/concurrent/Freezing.kt • kotlin/native/Annotations.kt • kotlin/native/concurrent/Worker.kt (maybe)

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https://github.com/ktorio/ktor Ktor asynchronous server and client(s)

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Kotlinx.serialization cross-platform / multi-format reflectionless serialization https://github.com/Kotlin/kotlinx.serialization

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Kotlinx.coroutines makes coroutines usable https://github.com/Kotlin/kotlinx.coroutines

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KNArch.db Kotlin Native Architecture - Database https://github.com/touchlab/knarch.db

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Future Changes •Add multithreaded reads and WAL support •Coroutines aware api •CursorWindow? •Other stuff

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https://github.com/square/sqldelight Sqldelight A Multiplatform Delight

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CREATE TABLE session( id TEXT NOT NULL PRIMARY KEY, title TEXT NOT NULL, description TEXT NOT NULL, startsAt TEXT AS Date NOT NULL, endsAt TEXT AS Date NOT NULL, serviceSession INTEGER NOT NULL DEFAULT 0, rsvp INTEGER NOT NULL DEFAULT 0, roomId INTEGER, FOREIGN KEY (roomId) REFERENCES room(id) ); insert: INSERT INTO session(id, title, description, startsAt, endsAt, serviceSession, roomId) VALUES (?,?,?,?,?,?,?) ; update: UPDATE session SET title = ?, description = ?, startsAt = ?, endsAt = ?, serviceSession = ?, roomId = ?, rsvp = ? WHERE id = ?; deleteById: DELETE FROM session WHERE id = ?; allSessions: SELECT * FROM session; sessionById: SELECT * FROM session WHERE id = ?;

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--Special query for schedule view sessionWithRoom: SELECT session.id, session.title, session.description, session.startsAt, session.endsAt, session.serviceSession, session.rsvp, session.roomId, room.name AS roomName, speakers.allNames FROM session LEFT JOIN ( SELECT sessionId,group_concat(fullName, ', ') AS allNames FROM sessionSpeaker JOIN userAccount ON userAccount.id = sessionSpeaker.userAccountId GROUP BY sessionId ) AS speakers ON speakers.sessionId = session.id JOIN room ON session.roomId = room.id ;

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SQLDelight + KNArch.db

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KNArch.threads Kotlin Native Architecture - Threads https://github.com/touchlab/knarch.threads

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KNArch.threads • Temporary-ish until better tools emerge • Atomic support (deprecated) • ThreadLocal • LiveData

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Multiplatform Settings Really Shared Preferences https://github.com/russhwolf/multiplatform-settings

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public expect class PlatformSettings : Settings { /** * A factory that can produce [Settings] instances. */ public class Factory : Settings.Factory { public override fun create(name: String?): Settings } public override fun clear() public override fun remove(key: String) public override fun hasKey(key: String): Boolean public override fun putInt(key: String, value: Int) public override fun getInt(key: String, defaultValue: Int): Int public override fun putLong(key: String, value: Long) public override fun getLong(key: String, defaultValue: Long): Long public override fun putString(key: String, value: String) public override fun getString(key: String, defaultValue: String): String public override fun putFloat(key: String, value: Float) public override fun getFloat(key: String, defaultValue: Float): Float public override fun putDouble(key: String, value: Double) public override fun getDouble(key: String, defaultValue: Double): Double public override fun putBoolean(key: String, value: Boolean) public override fun getBoolean(key: String, defaultValue: Boolean): Boolean }

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Timber Multiplatform logging https://github.com/JakeWharton/timber

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Atomic Fu Atomic operation support https://github.com/Kotlin/kotlinx.atomicfu

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Kotlinx.io multiplatform I/O library https://github.com/Kotlin/kotlinx-io

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OKIO2 MULTIPLATFORM

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MY WISH LIST

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Stable Gradle Plugins I know, but

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Significant Library Examples With publishing, for all targets

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Multithreaded Native Coroutines If I get 1 thing for Christmas…

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A Reactive Library Or maybe just coroutines?

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Xcode Debugging? Asking a lot, but still

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COMMUNITY WISH LIST

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Mocking Library See mockk repo

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Dependency Injection Or service locator I guess…

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Build Instrumentation kapt, compiler plugins

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Date Support JSR 310 or similar

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UI Stuff Here be dragons

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Getting Started

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Build Samples Conference apps, several others

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Kotlin/Native Docs Learn threads and state

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For Libraries? Multiplatform Settings (then the rest)

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Join the Kotlin Slack

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When?

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9 Coroutines (and other libs)

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9.3 Coroutines?

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Q3 Q2 Q4 Q1 Q2 2018 2019 0 .6 v0.7 v0.8 v0.8.2 v0.9.3 Coroutines? Other Libraries Docs/tutorials

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Thanks for the Images! Source Links at: https://bit.ly/2O0c469

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kevin@touchlab.co @kpgalligan

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kevin@touchlab.co @kpgalligan Join the team !