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Hey guys, I am learning kotlin Mutliplatform moblie. I am learning use of common module in ios application from the documentation. https://kotlinlang.org/docs/kmm-integrate-in-existing-app.html#connect-the-framework-to-your-ios-project What if we have pre-existing ios application. How can we use module code in ios application ? I didnt find this in document. Any guide would be great. Thanks

Is there a suggested way to provide an Android Context where needed in a multiplatform project? I'm using SQLDelight right now, which needs a context for creating a DB factory on Android, but not iOS or other platforms, but other libraries could have similar use cases in the future.

I want to setup multi module KMP project with one of the modules just having only common sources. Why have I to specify KMP target in that module? Actually I will not have any platform specific code there.

Hello. I’m quite new to multiplatform development. I’m seeking an advice. I want my iOS and Android app to be able to fetch a json file from network and cache it on a device for the purpose of performance. Is there a multiplatform library doing that? I would appreciate any recommendation or advice.

Hi Everyone. Is it possible to create a pure npm library with KMP? Could you point me to some document where I can understand where are the artifacts generated? And how to consume them from another node package? Thanks in advance!

Hello, Is there an official documentation with a suggested architecture for KMP apps/libraries? I am currently trying to create a library. The documentation I use for reference is the one provided by the Android. This currently what I am doing

my-project/
├─ shared/
│  ├─ feature.domain.usecase/
│  │  ├─ GetSomethingUseCase
├─ android/
│  ├─ feature.domain.usecase/
│  │  ├─ GetSomethingUseCaseImpl
├─ iOS/
│  ├─ feature.domain.usecase/
│  │  ├─ GetSomethingUseCaseImpl

Where

GetSomethingUseCase

interface GetSomethingUseCase {
    operator fun invoke(): String
}

And Android

GetSomethingUseCaseImpl

class GetSomethingUseCaseImpl(private val context: Context) : GetSomethingUseCase {
    override operator fun invoke() = TODO("It uses the context.")
}

And iOS

GetSomethingUseCaseImpl

class GetSomethingUseCaseImpl(private val context: NSBundle) : GetSomethingUseCase {
    override operator fun invoke() = TODO("It does use something else.")
}

I am not sure I am doing it the correct way. Without expect/actual, I am loosing some tips, like “missing implementation” errors at compile time 😞

Hi. Is anyone else facing issues while distributing a KMM iOS app on Azure CI? My app presents no errors when I try to distribute it locally, but on CI it always says that the module shared wasn’t found (

no such module 'shared'

). Can it be something related to the env config?

Hey, Did anyone try to implement socket communication with

Ktor

? Does it work on iOS as well?

Anyone know how to import the

-jvm

variant of a kmp project module?

// javafx sample module build.gradle.kts
plugins {
    kotlin("jvm")
    application
    id("org.openjfx.javafxplugin") version("0.0.11")
}

// java/javafx/application configuration...

dependencies {
    implementation(project(":multiplatform-module"))
}

The above keeps importing the

-android

variant of my

:multiplatform-module

😢

I wonder if it's possible to exploit

expect/actual

into checking at compile-time if all endpoints are implemented. Eg, having a common module in which you declare the different endpoints, having a client-side module that depends on it and must implement all the endpoints, and the same server-side. The difficulty is that the implementation on the client-side and the server-side will not look the same at all, and the server-side needs to know the list of endpoints so they can be registered in Ktor

I just noticed that on

./gradlew detekt

the konan compiler is downloaded. Is there a way I can make native compiler downloads lazy? Furthermore I only have mingwX64 and macosX64, why is my jvm build runner that happens to be linux downloading linux platform compiler stuff?

Hi there. I'm guessing I can't just

java.util.Date

in the

shared

module under

commonMain

? (I'm guessing this because the import fails, although I have other strange import failures)

When I start a new KMM project, add

implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.3.2")

to

commonMain

in my

shared

module, add

Clock.System.now().epochSeconds

in my

Greeting

file, then run the application in Android, it crashes with an error about not finding

java.time.Instance

.

why is there no

commonDebug

by default? whats the best way to create a dubug source set that links up correctly to android debug variant and ios debug configuration?

Is there a way to create a

sqldelight

DatabaseDriver

for Android without requiring a context? I want all of my database work to be handled by shared code and I don't love having to instantiate it all by passing in an Android context

Is there a way to see how the generated

equals()

of my data class actually looks like? I needed to change it to a normal class and now in Swift it does not work anymore. So I try to find out what the original generated method does different.

I am developing KMM library called edoLibrary used both on ios and android platforms. edoLibrary uses inside native modules responsible for video capture. On Ios platform video module called iosBiometry is added by c-interoperability. When I am publishing final edoLibrary binary and adding it to my ios project it also demands from me to add as a framework iosBiometry module with message: dyld: Library not loaded: @rpath/iosBiometry.framework/iosBiometry  Referenced from: /private/var/containers/Bundle/Application/5964BC21-66DB-4634-915A-450D647EC5E0/Multiplatform_Poc.app/Frameworks/edoLibrary.framework/edoLibrary  Reason: image not found Is there any way to export KMM shared module as umbrella framework containing all depended frameworks added by c-interoperability? I know that there is an export method but i don't know how to connect cinterop as a dependency. Or should I use cocoapods? below photo of iosBiometry c-interoperability and edoLibrary final native configuration.

🚀 is now available! ⚛️ A Touch of Multiplatform (ATOM) is a brand new monthly podcast dedicated to Kotlin Multiplatform, hosted by @touchlab_justin and me and produced by JetBrains and Touchlab! Check it out for Kotlin Multiplatform news and plans K In the series premiere, we host @dsavvinov and @kpgalligan for a discussion of Multiplatform Mobile’s road to Beta and Compose Multiplatform. Feel free to share your ideas on the next topics and guests for ATOM in 🧵 !

In one of my projects, I am using expect/actual for platform-specific behaviour. I now need my tests to be able to override this behaviour if possible (for example, having an actual class in both androidMain and androidTest). I would like the actual from the test source set to be used in tests, even in code in commonMain. Is this possible? When I define an actual class in androidTest, it complains that there's no expect declaration.

I started a project as a multiplatform library with android and ios client in different folders but publishing new versions is quite cumbersome and I now would like to move to the “centralized” file architecture, like the one created by the kmm module. I tried to replicate how it’s done from a freshly created project but I keep getting this error

Plugin [id: 'com.android.application'] was not found in any of the following sources:

and nothing after. So gradle doesn’t understand that the

buildscript

block is now define in a different gradle file. I did include

implementation(project(":shared"))

in the gradle file at the android app level but still the same issue. Are there any non-gradle configuration changes to do I am not aware of?

I have a kotlin class that takes a

suspend

function as a constructor parameter. How can I call this in swift? I've attempted to pass a simple closure but it complains it doesn't conform to

KotlinSuspendFunction0

. Any idea on the correct swift syntax? My attempt in 🧵.

I have a kotlin function that uses a default parameter value. Is there any way of using this in the generated ios/swift code?

[✅ SOLVED] How do I share fonts in a Compose Multiplatform library (Desktop and Android only) ? I am aware there’s a library to do this. But how do we achieve this without 3rd party lib?

I have

class

that takes a

suspend

function,

passedFn

, as a parameter. And the class has a

suspend

method,

fn()

. When

fn()

calls

passedFn()

I receive this error on iOS

illegal attempt to access non-shared Something.$fnCOROUTINE$0@2d9f788 from other thread.

I'm vaguely aware it has something to do with freezing objects across threads. Could anyone enlighten me further? What would I need to do in order to get this to work?

I have a

StateFlow

that I'm collecting from swift. It works with a class that inherits from

Kotlinx_coroutines_coreFlowCollector

. But it's rather ugly. Is there are more concise way? Code in 🧵

I'm trying to run my Kotest

commonTest

on iOS, however it doesn't look like any tests are run from the binary (

text.kexe

). Looking at the output from

$ ./gradlew iosX64Test --info

and running

xcrun

myself I get

$ /usr/bin/xcrun simctl spawn --standalone A92077C5-F953-4646-8FEE-C0F0A0C84C8F /Users/kieran/my-library/build/bin/iosX64/debugTest/test.kexe
[==========] Running 0 tests from 0 test cases.
[----------] Global test environment set-up.
[----------] Global test environment tear-down
[==========] 0 tests from 0 test cases ran. (0 ms total)
[  PASSED  ] 0 tests.

It works find for the JVM. My Gradle looks like:

kotlin {
    jvm {
        compilations.all {
            kotlinOptions.jvmTarget = "1.8"
        }
        withJava()
        testRuns["test"].executionTask.configure {
            useJUnitPlatform()
        }
    }

    ios {
        binaries {
            framework {
                baseName = "MyLibrary"
            }
        }
    }

    sourceSets {
        commonMain {
            dependencies {
                api "io.arrow-kt:arrow-core:${rootProject.ext.arrowVersion}"
                api "io.arrow-kt:arrow-fx-coroutines:${rootProject.ext.arrowVersion}"
            }
        }

        commonTest {
            dependencies {
                implementation "io.kotest:kotest-framework-engine:${rootProject.ext.kotestVersion}"
                implementation "io.kotest:kotest-assertions-core:${rootProject.ext.kotestVersion}"
                implementation "io.kotest:kotest-property:${rootProject.ext.kotestVersion}"
                implementation "io.kotest.extensions:kotest-assertions-arrow:1.1.0.98-SNAPSHOT"
            }
        }

        iosMain {
            dependsOn(commonMain)
            iosX64Main.dependsOn(it)
            iosArm64Main.dependsOn(it)
        }

        iosTest {
            dependsOn(commonTest)
            iosX64Test.dependsOn(it)
            iosArm64Test.dependsOn(it)
        }

        jvmTest {
            dependencies {
                implementation "io.kotest:kotest-runner-junit5:${rootProject.ext.kotestVersion}"
            }
        }
    }
}

Am I missing something?

In my kmp iOS app, I'm trying to create a

Set<Foo>

, where

Foo

is just a simple interface with a couple of functions defined in

commonMain

, and if I try to declare or instantiate this set in swift, I get the error "Type 'Foo' does not conform to protocol 'Hashable'". Is there a way to make my interface Hashable or is there another good way to have sets of my interface?

Where am I suppose to add custom maven repo configuration in a kmm project? I tried in

build.gradle -> buildscript -> repositories

,

build.gradle -> allprojects -> repositories

,

settings.gradle -> pluginManagement -> repositories

and

shared -> build.gradle -> repositories

but I always get the same error :

Could not find com.jeantuffierstatemachine1.5.0.

Required by:

project :shared

Hey! Question regarding Data Binding/Flow. How do you usually handle that in KMM Project? For using Kotlin’s Flow type for example, we need to implement wrappers. Currently I am playing around with https://johnoreilly.dev/posts/kotlinmultiplatform-swift-combine_publisher-flow/. What about normal

suspend

functions? I’ve noticed you can call

suspend/async

Kotlin function inside Swift, and it is compiled into a completion closure. One downside I see there, is

nullability

and would be nice to have

Swift's Result

type in it for example. Any best practices regarding data flow in KMM project? 🙏