Hi everyone, I updated from Kotlin 1.3.72 to Kotlin 1.4.10 today and I'm getting the following compilation error when I try to build my multiplatform library. Any idea what this is about? There are no references to my code on this error so I guess it's an issue inside Kotlin? Or is there anything I have to configure for this after the migration to to Kotlin 1.4 that can fix this?

I'm trying to set up a multi platform project, with two modules,

shared

and

desktop

. 'Shared' is the typical

multiplatform

gradle project, declaring

commonMain

and

jvmMain

sourcesets. 'Desktop' depends on 'shared', via:

implementation(project(":shared"))

However, the 'shared' source files don't seem to be available to the 'desktop' module. Do I need to do something special to 'publish' shared, or otherwise make it accessible to other modules?

Hi, I updated from Kotlin 1.3.72 to 1.4.10 and when trying to use my multiplatform library (imported as a module) on a JVM module I get the following error:

Ignoring dependency of module <MPP Lib> on module <JVM Module>. Java modules cannot depend on Android modules

Any idea why this would happen? It seems like the JVM module is trying to import the Android target of the multiplatform library instead of the JVM one.

Hello, does anyone know how to get rid of these log messages? I have them repeated hundreds of times in my builds because I have over 40 multiplatform modules targeting Android, and that makes eye scanning the logs way tougher.

The Kotlin source set androidAndroidTestRelease was configured but not added to any Kotlin compilation. You can add a source set to a target's compilation by connecting it with the compilation's default source set using 'dependsOn'.
See <https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html#connecting-source-sets>

I'm trying to set up some tests with suspend functions, It works fine on JVM but I'm curious what people are doing for JS and native?

Anyone know of a good way to get test coverage info for test runs on iOS and/or JS targets? Jacoco works for JVM, but it would be nice to get insight into coverage for platform-specific stuff

Hello, World! Trying to create a MPP library with 1.4.10, I get

Unresolved reference assertEquals

in my unit tests. I have these dependencies:

commonTest {
            dependencies {
                implementation(kotlin("test-common"))
                implementation(kotlin("test-annotations-common"))
            }
        }

Googling a bit it looks like I'm not the only one [1] - but I'm a bit surprised, this seems like a major problem. So I guess my question is: does anyone have a basic example project, with tests, that works? [1] = https://youtrack.jetbrains.com/issue/KT-40571

i have a multiplatform module (jvm and ios target), as well as a jvm based module. intellij is unable to find any of the sources from the multiplatform module (and says unresolved reference), but the gradle builds work fine. I've tried invalidating caches, removing .idea, and uninstalling intellij. any other ideas?

Hello everybody, I'm trying to build a library and I always find my imports unresolved, IDK if I should do something. but everything runs fine.

val commonMain by getting {
    dependencies {
        implementation("org.jsoup:jsoup:1.13.1")
    }
}

Hi, does anyone know how suspend functions are compiled for iOS?

I try to create library for macOS and iOS application. 1. I’ve read https://kotlinlang.org/docs/reference/native/cocoapods.html and add

cocoapods

into

build.gradle.kts

2. I’ve called

build

3. I’ve called

podspec

and

library.podspec

was created 4. I’ve called

podBuildDependenciesMacos

podSetupBuildMacos

- was created cocoapods dir with framework 5. I’ve called

podInstall

- but was not pod into list:

$ pod list

returns

0 pods were found

. What do I wrong? How can I create library for use in Xcode?

Today it was a great milestone! I was able to run exactly the same shared ViewModel on both Android and iOS, using

StateFlow

!!! I can easily say 85% of the code is on Kotlin Multiplatform, and 15% only on the platform-specific declarative UI (Compose and SwiftUI)! on Android, it uses Compose's `collectAsState`:

@Composable
fun MainLayout(coreModel: CoreViewModel) {
    val appState by coreModel.stateFlow.collectAsState()
    ...
}

on iOS, it uses a very simple class extending

ObservableObject

, where a StateFlow “listener” is initialized:

class AppViewModel: ObservableObject {
  let coreModel : CoreViewModel = CoreViewModel()
  @Published var appState : AppState = AppState()
     
  init() {
      coreModel.onChange { newState in
          self.appState = newState
      }
   }
}

this is the shared `ViewModel`:

class CoreViewModel {

  internal val mutableStateFlow: MutableStateFlow(AppState())
  val stateFlow: StateFlow<AppState>
      get() = mutableStateFlow

  fun onChange(provideNewState: ((AppState) -> Unit)) {
      stateFlow.onEach {
          provideNewState.invoke(it)
      }.launchIn(CoroutineScope(Dispatchers.Main))
  }
}

I am playing around with Multiplatform and Kotlin/Native. I want to be able to use

posix

in code shared between Linux/OSX. However I cannot get this to work at all. I have set

kotlin.mpp.enableGranularSourceSetsMetadata=true

and

kotlin.native.enableDependencyPropagation=false

like described in the docs. Then I have created a

nativeMain

source set:

val nativeMain by creating {
  dependsOn(commonMain)
 }

Then I have configured the

linuxX64Main

and

osxX64Main

source sets to depend on

nativeMain

. However I still cannot use

posix

in

nativeMain

. This issue happens both when trying to compile with Gradle as well as in IntelliJ (types / functions cannot be resolved). What am I missing?

Does anyone know if Kotlin suspend functions actually suspend on iOS and if so, how is it implemented on iOS?

Does anyone have a working example for a project with SqlDelight using migrations?

I have added a KMM module to my existing Android project via the wizard. The iOS project is in another repository. What's the easiest way for us to make a KMM proof-of-concept in the iOS repository? I would expect a generated ObjectiveC framework from the android project but can't seem to find it...

are there any recommendations on a Observer / RX multiplatform library targeting Android / iOS? I saw https://github.com/noheltcj/RxCommon but not sure how up to date is. Also not necessarily looking for RX specifically, but a framework perhaps already available to deal with observables on Android / iOS.

Hello 👋! Can I start a Kotlin MMP for Android & iOS with Android Studio on Windows? Does anybody have some samples on how to prepare the environment and "hello world sample" maybe?

My xcode updated to version 12 and since then I’m getting build error:

output:
Undefined symbols for architecture x86_64:
  "_objc_setHook_setAssociatedObject", referenced from:
      _platform_objc_objc_setHook_setAssociatedObject_wrapper100 in libobjc-cache.a(result.o)
     (maybe you meant: _platform_objc_objc_setHook_setAssociatedObject_wrapper100, knifunptr_platform_objc100_objc_setHook_setAssociatedObject )
ld: symbol(s) not found for architecture x86_64

Any idea how to fix this? 😓

Hello what are the best practices to implement multi-module Kotlin on iOS? We have multiple apps, each app can dependent on multiple feature frameworks. Here's an example diagram. From what I read is that the iOS App2 might see 2 versions of the classes in Module1... Because the frameworks are being compiled separately... Any suggestion/workarounds on how to solve this problem?

Currently working in a multi-platform project and wanna share the

CoroutineDispatcher

I'm using for iOS. There's a few variants out there, but this specific implementation allows for using

delay()

calls in suspend function. I keep this object inside my

SharedViewModel

and use it to define the

viewModelScope

for iOS coroutines.

Another great milestone today, after

Android

and

iOS

, I was able to run the shared ViewModel on

Web

too! I admit I never used

React

before, but with Kotlin it was incredibly easy to setup it up! I was actually thinking to use

Vue.js

for the web, because I was interested in a lightweight web framework, whose main capability is to provide a declarative UI, similar to what Compose and SwiftUI provide in mobile. But I was not aware of how simple Kotlin makes it to work with React! I am still astonished now. Kotlin hides most React complexity, and Android Studio even spins a node.js server on localhost to test the app, with no setup! My project uses a shared ViewModel, which means that changes to the app state only happen in the shared code. Such changes are then propagated via

StateFlow

to the platform-specific app code. In Kotlin/React it’s as simple as this to observe the app state changes via StateFlow:

fun myAppState() : AppState {
    val appDependencies = useContext(AppDependenciesContext)
    val (state, setState) = useState(appDependencies.coreModel.stateFlow.value)

    useEffectWithCleanup {
        val job = appDependencies.coreModel.stateFlow.onEach { setState(it) }.launchIn(GlobalScope)
        return@useEffectWithCleanup { job.cancel() }
    }
    
    return state
}

I’m trying to upload a multiplatform library to bintray, I’m following their doc from the github page :https://github.com/bintray/gradle-bintray-plugin I’m also using kotlin dsl for my build file and I’m not sure what I’m supposed to do for the step 7 :

publishing {
    publications {
        MyPublication(MavenPublication) {
            from components.java
            groupId 'org.jfrog.gradle.sample'
            artifactId 'gradle-project'
            version '1.1'
        }
    }
}

Where does

MyPublication

comes from?

Trying to find the easiest way to use a KMM library as a dependency for separate iOS, Android, and possibly Web, any suggestions?

Hello everyone! Can anyone please help me to understand why I cannot see the screen shown on 4th step? How can I solve it?

I am constantly getting this

ld: warning: ignoring file /Users/vivek/AndroidStudioProjects/kmm-sample/shared/build/xcode-frameworks/shared.framework/shared, building for iOS Simulator-arm64 but attempting to link with file built for iOS Simulator-x86_64
Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_SharedGreeting", referenced from:
      objc-class-ref in ContentView.o
  "_OBJC_CLASS_$_SharedCalculatorCompanion", referenced from:
      objc-class-ref in ContentView.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I am able to open the xcodeproject in XCode and run it on the iphone Simulator there.

I have successfully setup a multiplatform project. But I want to have my project as a multiplatform multi project. so I'm wrapping it all inside the

allprojects

and this works fine, but as soon as I add a

include

to my

settings.gradle.kts

file I immedietally get this error:

Extension with name 'kotlin' does not exist. Currently registered extension names: [ext]

. Does anyone know how to setup a multiplatform multi project using kotlin gradle script? or is this something that's not possible yet?

Question: How do I setup a iosApp as a workspace instead of project, mine is designed to only run when launched through xcworkspace not xcodeproj? I am trying to change the flag in xcodebuild from -project to -workspace Anyone have any luck with setting up their KMM plugin to do so?

Anyone have any experience adding Multiplatform framework to a iOS workspace which uses Carthage for managing frameworks?