Getting started with Kotlin/Native in a project near you

Given at an internal company event.

Want to getting started with Kotlin/Native in your Android and iOS TODAY?
Fine, let's do it.
In this talk I present how to setup everything so that we can start coding on a shared library for both platforms.

Transcript

1. Getting started with Kotlin/Native in a project near you
2. Kotlin/Native Kotlin/Multiplatform
4. Kotlin + /JVM + /Native + /JS = Kotlin/Multiplatform
5. Kotlin + /JVM + /Native + /JS = Kotlin/Multiplatform
7. We have a problem in the Kotlin/Multiplatform docs
8. . ├── SharedCode │ └── src │ ├── commonMain │ ├── androidMain │ └── iosMain ├── android │ └── src │ ├── main │ ├── test │ └── androidTest ├── native │ └── KotlinIOS │ ├── KotlinIOS │ ├── KotlinIOSTests │ └── KotlinIOSUITests └── ... Taken from github.com/kotlin-hands-on/mpp-ios-android
9. someProjectRepo /iOS someProjectRepo /Android
10. someProjectRepo /iOS someProjectRepo /Android someProjectRepo /mobile
11. someProjectRepo /iOS someProjectRepo /Android someProjectRepo /mobile
13. What if…
14. an independent project creates artifacts (Jar & Framework)
15. which can be published
16. and imported in our existing projects // Gradle (Android) repositories { maven(url = "https://artifactory.some.thing") } dependencies { implementation("something:sharedLib:1.0.0") } // Carthage (iOS) binary "https://artifactory.some.thing/something/sharedLib.json" ~> 1.0.0
18. iOS devs... welcome to the world of Gradle
19. plugins { kotlin("multiplatform") version "1.3.50" } kotlin { jvm() // This is for real iDevices iosArm64().binaries.framework() // This is for simulators iosX64().binaries.framework() } repositories { jcenter() } val jvmMainImplementation by configurations dependencies { commonMainImplementation(kotlin("stdlib-common")) jvmMainImplementation(kotlin("stdlib-jdk8")) }
20. That's it Happy coding y'all
21. Uhm.. sorry. But you said something about artifacts and publishing
22. Build tasks ----------- - jvmJar - linkDebugFrameworkIosArm64 - linkDebugFrameworkIosX64 - linkReleaseFrameworkIosArm64 - linkReleaseFrameworkIosX64 Artifacts - Jar and Framework ./gradlew tasks
23. pluginManager.apply("maven-publish") // Setup our artifactory repository extensions.getByType(PublishingExtension::class.java).apply { repositories { repoHandler -> repoHandler.maven { it.name = "Artifactory" it.url = project.uri("https://artifactory.some.thing/something") it.credentials { credentials -> credentials.username = properties["artifactoryUser"] as? String credentials.password = properties["artifactoryKey"] as? String } } } } Publishing - Jar
24. // Creates a task to pack the `iosArm64` & `iosX64` Frameworks // into one Framework. // This is because the Simulator and Devices running on different platforms. // Therefore we need a Framework which runs on both. val fatFrameworkTask = tasks.register("releaseFatFramework", FatFrameworkTask::class) { … } // Well, it's complicated! Publishing - Framework
25. We are using Carthage as a… "dependency manager"* *Seems only Gradle users get this joke
26. FatFramework kotlin { iosArm64().binaries.framework { baseName = "sharedLib" } iosX64().binaries.framework { baseName = "sharedLib" } } val fatFrameworkTask = tasks.register("releaseFatFramework", FatFrameworkTask::class) { baseName = "sharedLib" from( kotlin.iosArm64().binaries.getFramework("RELEASE"), kotlin.iosX64().binaries.getFramework("RELEASE") ) }
27. ...Zipp it and publish val zipFramework = tasks.register("zipFatFramework", Zip::class.java) { it.dependsOn(tasks.named("releaseFatFramework")) it.from("$buildDir/fat-framework") it.archiveFileName.set("sharedLib.framework.zip") it.destinationDirectory.set(file("$buildDir/fat-framework-zip")) } tasks.register("publishFatFrameworkToArtifactory", Exec::class.java) { it.dependsOn(tasks.named("releaseFatFramework"), zipFramework) it.commandLine("jfrog", "magic") }
28. Create a JSON file for "versioning" /** * // The code should generate something like this: * ``` * { * "1.0.0": "https://artifactory.some.thing/1.0.0/shared.Framework.zip", * "1.0.1": "https://artifactory.some.thing/1.0.1/shared.Framework.zip", * "1.1.0": "https://artifactory.some.thing/1.1.0/shared.Framework.zip" * } * ``` * Basically a `version <-> Framework location` mapping. */
29. ...and publish it as well tasks.register("publishFrameworkJsonToArtifactory", Exec::class.java) { it.dependsOn(downloadAndModifyJson) it.commandLine("jfrog", "magic") }
31. Q'nd A