Those using KMM for iOS development - how have you worked with / around these errors?

Exception doesn't match @Throws-specified class list and thus isn't propagated from Kotlin to Objective-C/Swift as NSError.
It is considered unexpected and unhandled instead. Program will be terminated.
Uncaught Kotlin exception: com.apollographql.apollo.ApolloNetworkException: Failed to execute GraphQL http network request

Seems a built in part of the KMM framework is if your Kotlin function doesn’t mark @Throws() with the exception, KMM crashes your app. There’s no compile time safety enforcing that only exceptions annotated in @Throws, so it is possible that an exception is missed that later ends up crashing your iOS application. This is undesired behaviour, as if we miss documenting an exception, it can crash in the wild. In iOS, we typically just show an error message when an unexpected error arises. Is there a way to ensure that Kotlin never crashes us in this case?

In my KMP project I am trying to sort a HashMap by its keys, however I noticed that

toSortedMap

seems not to be available in the common module only the JVM. What is the way to sort a hashmap in the common module?

Hello everyone, I am working with KMM & KTOR to post data to an API. However , when the post request is successful, it returns a set of API-specific headers. I am supposed to use one of the header information to make another request. So , I made the POST request to return an HttpResponse. However, AS shows this error when trying to make the post request in my main activity in android studio. Please any idea on how I can fix it? Thank you

Hi everyone 👋, The KMM team is keen to improve our documentation, and right now we are working on improving documentation dedicated to Objective-C interoperability. Please help us make it better by taking part in a short survey. Feel free to DM me in case you have any questions. Here is the link to the survey.

When building a multiplatform app for Android, I notice that I have two

mapping.txt

files -- one in the

shared

build, and one in the Android app build. However, the Play store only accepts one file. Does the Android one contain all the necessary information from

shared

?

How can you share test util code between multiplatform modules? Should I put it in main sourceset?

Hey guys 👋🏻,are there any good resources you’d recommend to get started with kotlin native? (Besides official Kotlin docs). Thank you!

Hi, I’m building a multiplatform app and I have run into an issue in iOS regarding SwiftUI preview not working at all. I’ve boiled the issue down to the following minimum working example: I’m using an Android Studio KMM template project with the iOS framework distribution set to the CocoaPods dependency manager. When use a class that has the member-parameter syntax (I don’t know how it’s called? i mean “testString” in the following example code) in a View, the preview crashes. An example for such a class would be:

//Does not work with SwiftUI preview
class Greeting1(
    var testString: String
) {
    fun greeting(): String {
        return "Hello, ${Platform().platform}!"
    }
}

//Works with SwiftUI preview
class Greeting2(
    testString: String
) {
    fun greeting(): String {
        return "Hello, ${Platform().platform}!"
    }
}

An instance of this class being part of the view, even if none of its members are actually displayed, crashes the preview. It works fine on the simulator though. This does not happen in the template project when using the Xcode build phases framework approach, the one with the packForXcode task. Does anyone have any idea what could cause this?

Can you use shared resources for tests in a Kotlin Multiplatform Mobile project? I tried to include some JSON files under

src/commonTest/resources

but they don't seem to get copied to the output directory when running Android tests. Putting them under

src/androidTest/resources

did the trick for Android tests, but I don't want to have two copies of these files, as they are common for both Android and iOS tests.

Is there a Kotlin Multiplatform library to work with files? a simple wrapper to

java.util.File

on the JVM and POSIX calls on Kotlin native

fopen

,

fclose

,

acccess

, ...

Anyone figured a nicer way to consume a stateflow from swift side?

Hello everyone 👋 is anyone interested in joining a Kotlin multiplatform project for a new app? I'm looking for teammates 🙂 Tech stack is the ideal : Kotlin multiplatform + SwiftUI + Compose + GraphQL. Sydney or Australia based only 🇦🇺

Hi, I have a question on kotlin multiplatform and memory management for ios and I am very grateful if someone has an hint for me here. When using classes from a kotlin multiplatform shared module in an ios app (f.e. in a local function context in a view controller) - when this view controller gets removed from memory the kotlin multiplatform sdk classes still continue living in the memory. Is there a way to also remove them from there? Is that a known issue?

Hi did anybody succeed with resuming 

suspendCoroutine

 from another thread? Im getting

CoroutinesInternalError: Fatal exception in coroutines machinery for DispatchedContinuation

Hi folks! I've written an article about intercepting network calls using KMM/Ktor and throwing custom exceptions (it turned to be pretty tricky topic), it might help some of you too. Here's the link: https://yusufabd.medium.com/kotlin-multiplatform-mobile-intercepting-network-request-and-response-6805a79b4699

Has anybody faced problems when including resources in the

androidTest

source set?? I'm getting this:

Warning:project ':xxx': Unable to build Kotlin project configuration
Details: org.gradle.api.InvalidUserDataException: Source directory '/Users/xxx/Documents/projects/xxx/src/androidTest/resources/provider-metadata.json' is not a directory.

when reloading the Gradle project in Android Studio. I've tried putting the file both in the root

androidTest/resources

directory and in a nested folder under that directory. If I do the following it works properly: 1. Remove any files under

androidTest/resources

2. Reload the Gradle project in Android Studio 3. Move/copy files to

androidTest/resources

4. Run tests to my heart's content without any problem using existing Android Studio's Run/Debug configuration I can also run

./gradlew build

or

./gradlew test

without any problem with files located under

androidTest/resources

... I've even tried to re-create the Android Studio project deleting the

.idea

folder and re-opening the project... what am I doing wrong????

Hi! I'm trying to add an extension to ByteArray that converts it to NSData, following this snippet: https://gist.github.com/noahsark769/61cfb7a8b7231e2069a9dab94cf74a62. I've added a new file with the extension in the iosMain module, but I cannot see it in the iOS code. What am a I missing?

There is a way to write things to apple keychain directly from kotlin?

Hey 👋 Im a student whos new to kotlin multiplatform. I am builing a KMM app and was wondering if anyone has used any projects that allow for shared view models in KMM

With KMM still in Alpha, how do you convince a team that doesn't use Alpha libraries that KMM's alpha is different from the average alpha framework? (not just pointing them to other big team companies that has KMM in production). More like, how reliable is KMM's alpha state?

what do you all think about save tokens in ios userdefaults?? i saw a lot of devs yelling about how it’s unsafe.. but it’s like sharedprefs on android.. i know it’s not encrypted, but you need access to devices filesystem to read it.. correct me if i am wrong: you need to hack the device or stole the device to have access to it. (and after that you need to understand what it is and how to use)

While it's an early soft-release (what the customer themselves termed 'Pre-MVP'), I'm proud to say my team successfully launched our Kotlin Multiplatform App to the store today! :kotlin: 💪 📱 BarnTalk for iOS on the AppStore :android:  BarnTalk for Android on Google Play

Hello! Is there library for mocking common code? I have some classes in common code and I would like to write unit tests, so I need to mock their dependencies. Which library is suitable for that?

I'm slowly losing my mind over Android Studio Canary 15. Suddenly (it worked fine for a few days and then stopped) it went rogue with indexing and I can't fix it. I tried every trick in the book including removing android studio, restarting computer, removing AS settings etc. Everything from here as well: https://kotlinlang.slack.com/archives/CRDCFF3RC/p1618779620052500 Project builds just fine, it's just that Android studio doesn't index most classes, including very basic ones like platform.Foundation or any external libraries. It stopped marking the right directories as sources root like you see in the screenshot. I can mark them manually, but it doesn't fix the issue with indexing libraries or

platform.*

etc. I guess the problem is with it not properly collecting sources, but how do I fix it?

Is there a website that explains the KMM architecture in an UML way? I want to know for example if Dependency Inversion is used with the shared module and ios/android specific implementation in the source sets

Hello, I am currently trying to assemble a starter project for people who want to write command-line tools in Kotlin multiplatform. I would appreciate if you can have a look and tell me what you think Thanks! 🙏🏻 https://github.com/jmfayard/kotlin-cli-starter

Hi Foks, I’m getting

kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen

exception.

Dependencies info -
kotlin = "1.4.30"
coroutines = "1.4.2-native-mt"
serialization = "1.0.1"
ktor = "1.4.2"

This is what I’m doing -

class Manager {
 var user: User
 init(){
  GlobalScope.async(context = Dispatchers.Default) {
  val result = callToSuspendFunction
  user = result //ERROR ON THIS LINE
 }
}

How to achieve something like this?

Hi Forks, I'm exploring KMM, I have done with the setup in Android Studio. I could able to run the Android app perfectly, but when I try to run the ios app, facing an issue in configuration setup. Xcode project scheme Dropdown is empty. • But when I launch the ios App directly from Xcode, the app is working perfectly.

I am trying to replace

packForXcode

with the

cocoapods

approach, everything runs fine on the android, but i get an error while trying to build for ios. Error shown ☝️