hey all, I keep running into this error on iOS when trying to cast a type of

Any

to a more concrete type

Could not cast value of type 'kobjcc0'

Hi, I’m trying to save data to the iOS keychain. I use the following piece of code to accomplish that:

val searchDictionary = CFDictionaryCreateMutable(kCFAllocatorDefault, 5, null, null)

        CFDictionaryAddValue(searchDictionary, kSecClass, kSecClassGenericPassword)
        CFDictionaryAddValue(searchDictionary, kSecAttrService, CFBridgingRetain(appName))
        CFDictionaryAddValue(searchDictionary, kSecAttrGeneric, CFBridgingRetain(identifier))
        CFDictionaryAddValue(searchDictionary, kSecAttrAccount, CFBridgingRetain(identifier))
        CFDictionaryAddValue(searchDictionary, kSecValueData, CFBridgingRetain(NSNumber(int = 2048)))

 SecItemAdd(searchDictionary, null)

But I keep getting OSStatus -50 (One or more parameters passed to a function were not valid.). I followed several Ojective-c tutorials to come up with this code and it should be valid.. Someone got an idea what I’m missing?

hmmm, I seem to be experiencing a deadlock inserting a record into a sql delight database (while running iOS tests)

so the above issue is actually rooted in using

CoroutineWorker.execute

with

CompletableDeferred

. anyone have an idea why completing the deferred might deadlock when used from

execute

?

in intellij, when you click a play button next to a test and choose debug, how do you change that to use a different target (i.e. android instead of mingw) for debugging?

how should i be configuring my build script to use generics? i tried following the documentation and digging into the PR that added generics support but i don't know if i'm doing it right

tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinCommonCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xobjc-generics")
    }
}

has anyone figured out how to turn off the sql delight verbose logging?

Hi all, I have created this stack overflow with an issue I'm having in my

build.gradle.kts

file. I have marked the lines that have problems with comments. If you have any suggestions it would be a big help. https://stackoverflow.com/questions/60208710/spring-boot-gradle-dependencies-in-kotlin-multiplatform

It appears that data class is not fully compatible with iOS SwiftUI/Combine ObservableObject. Using this template app: https://github.com/joreilly/PeopleInSpace which lists people in space. On iOS its using SwiftUI and MVVM with viewmodel class (inherit from ObservableObject) that has a list/array of People object which is Kotlin data class in commonMain. The iOS basically calls the Repository class in commonMain to retrieve a list of People objects and display in list view. ObservableObject in SwiftUI/Combine is setup to update the SwiftUI list view whenever there is any changes in viewmodel class. Everything works fine if youre not changing the content of People object, like the sample template app. But when you try to change the attribute of the People object, the update is not reflected in the SwiftUI list view. So I changed the viewmodel class to have a list of PeopleIOS object, which is a struct I define in iOS. When retrieving the list of People object from commonMain, I convert them to a list of PeopleIOS, and use this structure in SwiftUI list view. And the changes is reflected in SwiftUI list view. I’m only few days picking up KMP so not so sure if I did anything wrong. Trying to look for a sample app that has KMP/SwiftUI/Combine that edit the commonMain data class model, if there is any would like to take a look. And I find the KaMPKit too much for KMP beginner. It might do more damage than getting people to adopt KMP.

Ok I found the problem.. Missing the logback implementation. Weird that was working on iOS though without it..

Ok now I have a weird issue. My application is working fine on debug mode. But not when build with release.. My issue came from the serializer here the message: • Can’t locate argument-less serializer for class • (Kotlin reflection is not available). For generic classes, such as lists, please provide serializer explicitly.

Hey, when I link my Kotlin Multiplatform framework with an iOS app extension, I get this warning: „Linking against a dylib which is not safe for use in application extensions“ In Xcode I can set this build flag APPLICATION_EXTENSION_API_ONLY. I think I need to add this somehow to my framework target in the grade build script. Somebody knows how?

This message was deleted.

Is there any way to debug common tests with 1.3.6x? It currently does not stop at breakpoints. I develop a library mainly through common tests and that workflow is broken. It seems it was broken in the last Kotlin release and no activity to fix it in over a month. (I would expect a hotfix) Maybe I missed a method to make the tests pause at breakpoints? https://youtrack.jetbrains.com/issue/KT-35632

Are there any guidelines on when you should run tests for common code on all target platforms and when it is not needed? Context: In our mobile multiplatform app, our domain (use cases) are shared. This is just the business logic and there's no thread switch happening for example. The entire domain layer executes on a single thread. Currently we run these tests as JVM tests on the development host. Does it make sense to somehow test it on iOS as well, especially since this layer is not impacted by the memory model?

Is there a good list of MPP-ready open source libraries out there? Doing a bit of research for a talk I’m preparing. I’m aware of some of the big ones [okio, moshi, SQLDelight], but not much beyond that.

Hey, Can I get an answer please to whether the database created by sqlDelight is not suppose to persist changes made due to the fact that the database is created using the platform specific SQL drivers. If that’s true is there a way to persist the changes to be seen by more than one platform?

Hey guys! I have an implementation doubt, may be you can help me: I have a shared single common class that internally holds a

MutableMap

, so: For JVM: I use the

ConcurrentHashMap

class For Web: I use just a

mutableMapOf

But for Native, I have to

freeze()

the singleton to avoid the

IncorrectDereferenceException

. So, if the whole graph is frozen, I don’t know how to have a

MutableMap

inside it. Any tips?

Anyone know of jobs in this? I'm novice but been coding 20 years and this is the only way I've been able to solve my dreams. Just nobody is paying me to do it and minimal time to do it on my own...

Anyone has a working jacoco sample file?

I’m doing some multiplatform date work. Currently I have an expect class called

Date

. I have it aliased on the jvm as

actual typealias Date = java.util.Date

I would like to define a method in the expect class called

before(date: Date): Boolean

. Currently I’m doing it like:

expect fun Date.before(date: Date): Boolean
//jvm
actual fun Date.before(date: Date): Boolean {
    return this.before(date)
}

This gives me a shadowing warning. Is there a way to do something like

actual  fun Date.before(date: Date): Boolean = java.util.Date.before

?

Good morning multiplatform trailblazers!!! I have a very noob question but i get mixed signals from the Internet. I can read here and there it’s possible to have access to generics from swift code by activating the

Xobjc-generics

flag on the compiler. That being said i keep having my type erased on the swift side and have to deal with a

Any?

instead. The type im trying to use is the

Result

type. Do you have any idea if it’s possible? Do I have to write my own

Either

type?

Getting stuck on trying to setup remote publishing to Bintray with a Kotlin Multiplatform project. Every time the publish Gradle task is run Gradle becomes stuck when the message

Configure build..

is outputted.

I've been trying to get a KMP app to compile today to a WatchOS device. I swear this worked before, however the error I'm getting is:

ld warning: ... building for watchOS-armv7k but attempting to link with file built for watchOS-arm64_32

Undefined symbols for architecture armv7k:
  "_OBJC_CLASS_$_CommonAssignment", referenced from:
      objc-class-ref in ViewModel.o

I don't remember seeing armv7k before. Any ideas about this?

Hello! I have a KMP module called analytics-interface with targets

ios

and

jvm

that contains class A:

class A {
    fun foo() { ... }
}

and another KMP module called analytics with targets

ios

and

android

that contains class B:

actual class B : A() {
    fun bar() { ... }
}

When I run

./gradlew :analytics:assembleRelease

, the analytics-release.aar artifact is generated, and when I plug it in Android library, I can do

B().bar()

but not

B().foo()

. What am I doing wrong? EDIT Added a project to reproduce the issue https://gitlab.com/NikitaKhlebushkin/kmp-multi-module

Is there a way to figure out if I am using the debug or the release executable at runtime?

Is there a compile time option to hide the console window in Windows? Every time I start the App, the console is visible for a brief moment if I use

FreeConsole()

or

ShowWindow(GetConsoleWindow(), SW_HIDE)

TL;DR How to move/distribute built framework for iOS to another machine? Full story I have a framework in KMP with cocoapods dependency. I'm building it by ./gradlew :module:podspec, then add the location to Podfile and run pod install. Finally, I'm building iOS project that has the build phase from .podspec and it uses Framework and it's all good. Now, I need to plug the output framework into a project on another machine, so I go to build/bin/iosX64/debugFramework and send the myproject.framework to my friend on the another machine. He plugs it into Xcode, runs a build for simulator and gets

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_AnalyticsInitParameters", referenced from:
      objc-class-ref in Analytic.o
  "_OBJC_CLASS_$_AnalyticsAnalytics", referenced from:
      objc-class-ref in Analytic.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

1. Is there a right way to distribute resulted iOS framework? 2. What am I doing wrong?

Question about

suspend

functions and iOS: Am I correct in assuming that even when running on iOS, suspension does work as it does on Android (without blocking the thread it is running on etc)? The only limitation being that a

suspend

function cannot be invoked from Swift/Obj-C code?