Hi all, I’m currently having trouble converting a Kotlin

Map

to an objective-c

CFDictionary

using

CFDictionaryCreate

. The main issue is using the pointers to go back and forth between Kotlin and Objective-C. Here’s my code so far (not generic for now will be later)

fun Map<CFStringRef?, Any?>.toCFDictionary(): CFDictionaryRef? {
    return CFDictionaryCreate(
        kCFAllocatorDefault,
        keys,
        values,
        size.toLong(),
        kCFTypeDictionaryKeyCallBacks,
        kCFTypeDictionaryValueCallBacks
    )
}

There is a type mismatch for the second, third, fifth and sixth arguments. Second and third arguments should be CValuesRef<COpaquePointerVar>? but are currently Set<CPointer<__CFString>?> and Collection<Any?>. The last two arguments should be CValuesRef<CFDictionaryKeyCallBacks>? and CValuesRef<CFDictionaryValueCallBacks>? but are CFDictionaryKeyCallBacks and CFDictionaryValueCallBacks. I do not know how to convert those values to the expected ones, can anyone help me plase ? Thank you for your time.

is there any meaningful workaround to be able to access shared-code Sealed Classes from Swift?

Hey there, I tried googling without much help, and I figured I should ask here. Is there a way, I can write and compile kotlin multiplatform apps that also targets ios from a linux machine? the reason is I can't afford a mac. or, is there any form of setup I can do on a PC or even install a non official mac os so that I can also build for ios? I know this has so little to do with kotlin, but I am guessing this is where I can get help from. Thanks in advance

Hey everyone ! Am I the only one to have collision naming issues when generating obj-c headers ? If I have two interfaces with a same property but of different type, the compiler will add an

_

at the end of one of them in the header.

interface A {
    val foo: Int
}
interface B {
    val foo: Int?
}

I will have the following header:

__attribute__((swift_name("A")))
@protocol A
@required
@property (readonly) int32_t foo __attribute__((swift_name("foo"))); // <----- foo: OK
@end;

__attribute__((swift_name("B")))
@protocol B
@required
@property (readonly) KotlinInt * _Nullable foo_ __attribute__((swift_name("foo_"))); // <----- foo with an underscore: NOK
@end;

I didn't find any issue on https://youtrack.jetbrains.com/ So I ask to you here before opening one. _P.S: if props have the same type, there is no collision and no `_`_ added.

Hello community 👋 I was exploring how to work with

StateFlow

on the Swift side and I come up with this idea in order to translate the stream into a

Combine

Producer. I have the feeling that I’m reinventing the wheel 🤔 Is there any better alternative already available to achieve these adapters seamlessly? https://gist.github.com/gbasile/955b22e7334dc5c5dcbef8ed0e7fccde

Hey everyone👋 is there any iOS developer based in Australia looking for new opportunities here?

Hi all, I’m new to iOS development and trying out kotlin multiplatform. Does anyone know of a good example or a way for consuming fat xcframework .zip artifact in a native iOS app from a remote location?

So it’s probably a long shot as I sometimes feel like I’m the only one doing UIKit in Kotlin, but does anyone know if there’s a know bug or trick with

CAGradientLayer

in Kotlin/Native? I really can’t get it to work even on a simple view and I feel like I checked all the problems people usually encounter when using it in ObjC/Swift

What tactic should I use for the following scenario? • I have an existing XCode project that uses XCodegen and a Podfile • I created a KMM project with logic I want to share between JVM and iOS What steps should I take to use my logic in my XCode project? Should I create fat frameworks? An XCFramework? Something else?

👋 hey folks Has anyone tried to expose an interface with a suspend function and implementing this interface in Swift? Is it even expected to work? I’m trying this rn and if I call

completionHandler

not on the same thread the “coroutine” method was called on, I get illegal sharing exception:

class DependencyImpl: FooBarDependency {
    func getName(completionHandler: @escaping (String?, Error?) -> Void) {
        ...
    }
}

When thread stays the same, it’s all good. I’m using coroutines 1.5.1-native-mt. Kotlin code in comments.

👋 it’s me again how does one use

XCFramework

extension function from

build.gradle

(no KTS)? Importing

import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework

doesn’t work:

unable to resolve class org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework

👋 let’s say I have this:

public expect class PlatformDecimal
public expect value class Decimal(public val impl: PlatformDecimal)

// in iosMain:
@Suppress("CONFLICTING_OVERLOADS")
public actual typealias PlatformDecimal = NSDecimalNumber

public actual value class Decimal(public val impl: NSDecimalNumber) {

If I make a framework out of it, all instances of

Decimal

have type of

id

(I’d expect

NSDecimalNumber

there) in the generated Objective-C header. Is this a known limitation?

Anyone who has experienced an issue with Cocoapods? In the attached error, I’m trying to add ‘SQLCipher’, but the same error occurs when I try to sync gradle with Pods like ‘AFNetworking’ or ‘Reachability’, those that are Objective-C pods. This doesn’t occur on my other mac. I’m just wondering if anyone ever experienced this and what steps you did to solve this? Thank you.

Hi, I would like to know if it’s possible with Kotlin MPP or Kotlin Native, to create an IntentExtension as a kotlin MPP library. I’m stuck with the glue-code actually, because Kotlin allows me to check for SiriKit permissions and add words to an INVocabulary, but it actually fails because of

Info.plist

missing entries about NSExtension. Is it possible to create these entries for handling custom Intents with a kotlin project?

This will probably be a bit vague of a question, but it’s related to ktor, and we’re generating an OpenAPI client from a certain source, into KMM code. Not sure if anyone has any sort of experience when it comes to KMM, OpenAPI and iOS. Let’s take this client for example, since I had troubles integrating this from the beginning (I found a workaround back then, but now there’s a major issue with our own client) https://github.com/andrewemery/openapi-generator-kotlin-multiplatform-petstore These errors only occur on Kotlin Native, specifically for iOS. The issues are pretty similar to this: https://youtrack.jetbrains.com/issue/KTOR-1087 Our solution was to wrap it inside an immutable object, and yes, it worked.

object ClientWrapper{
    val api = PetApi()
}

While it did work, now we have some adjustments on our own client. It needs to have a Bearer Token. In order to that, I need to call the

setBearerToken()

function inside the

api

. But I can’t do that when it’s wrapped in an immutable class. So I had to instantiate the Api object everytime I need to set the bearer token. The thing is, it’s not working at all in iOS. It gives me off an error of “Frozen Mutability Exception”, it’s kind of pointing out on the lazy variables. While I get the gist of the problem, what I’m not sure of is how to do some workarounds to solve this problem. Putting a

@ThreadLocal

on the client wrapper itself doesn’t seem to work at all. Has anyone ever solved this? I’m seeing certain youtrack posts that it will not be solved until Kotlin changes some memory stuff, but I’m not sure. I hope someone can help me figure this out. Thank you.

Hi! 👋 I'm creating a wrapper for a multiplatform dependency. Some functions of my wrapper are not available to my iOS app (those that have types in their signatures that were defined by the dependency I'm wrapping). Interestingly, these functions exist in the

shared.h

header file though. Do you have any idea how I might be able to make these functions available to my iOS App code?

Hey there! 👋 I'm trying to pack the classes of a

cinterop multiplatform dependency

into the

shared.framework

for my iOS app (to make them available). The dependency uses

cinterop

as it's wrapping a C library. I'm already trying to

export

it via the Gradle setup (see setup in the thread). Though when building in either Xcode or AppCode, I get an error about

missing symbols for architecture x86_64

and a warning that the

dependency can't be exported

(see error log in the thread). I tried fixing this by including the

.def

file of the wrapping dependency and the

include

folder of the C library itself and making the export

transitive

. But this didn't help. I'm using Kotlin 1.5.31.

Hello https://github.com/JetBrains/skiko/commit/8cde16e17cd01d7e8efc5e903f42266bb22c91df

Hi, where exactly is the

embedAndSignAppleFrameworkForXcode

task defined? I'm running the

kmm-integration-samples

test project, and when I simply run the iOS target it builds successfully:

> Task :shared:linkDebugFrameworkIosX64
> Task :shared:assembleDebugAppleFrameworkForXcodeIosX64
> Task :shared:embedAndSignAppleFrameworkForXcode

BUILD SUCCESSFUL in 13s
4 actionable tasks: 4 executed

But I can't see such a task in Gradle tasks, and when I try to run the task manually, Gradle can't seem to find it:

$ ./gradlew :shared:embedAndSignAppleFrameworkForXcode

> Configure project :shared
Kotlin Multiplatform Projects are an Alpha feature. See: <https://kotlinlang.org/docs/reference/evolution/components-stability.html>. To hide this message, add 'kotlin.mpp.stability.nowarn=true' to the Gradle properties.


FAILURE: Build failed with an exception.

* What went wrong:
Task 'embedAndSignAppleFrameworkForXcode' not found in project ':shared'.

Hello can I use the Preview also in appCode like on xcode ?

Hey guys. How can we use InjectionIII with the new KMM project with Gradle generating the Xcodeproject ? In essence, I'd like to use this method : https://www.jetbrains.com/help/objc/create-a-swiftui-application.html but in a project created by AppCode with Gradle.

I am running into an issue regarding duplicate frameworks with cocoapods. I am trying to consume a kotlin generated framework into 3 modules inside of my xcode projects: • iosSdk • iosSdkUx • iosSdkSampleApplication I have tried adding this flag to the kotlin project, but am still running into the error.

kotlin.native.cacheKind=none

I also have a post install script inside of my podfile which was working when I was only consuming the kotlin generated framework in

iosSdk

and

iosSdkUx

. But when trying to add the third it fails (

iosSdkSampleApplication

). (SEE THREAD FOR PODFILE) Here is the error I am getting:

objc[29904]: Class ISSDouble is implemented in both /Users/ME/Library/Developer/Xcode/DerivedData/iosSdk-ftsmsdlkscvzlmdbohckpjheeupx/Build/Products/Debug-iphonesimulator/iosSdkUx.framework/iosSdkUx (0x110508d60) and /Users/ME/Library/Developer/CoreSimulator/Devices/7C739BFB-DFD9-4F88-A2D4-4185065B258D/data/Containers/Bundle/Application/C98D5D0A-45C5-43F5-A4AA-70C42E3E283F/iosSdkSampleApplication.app/iosSdkSampleApplication (0x103bbb2f0). One of the two will be used. Which one is undefined.

Hi there! Looking to find out if anyone is using https://kotlinlang.org/docs/apple-framework.html in practice here in their shipping apps that otherwise use Swift and if there were any big pain points/tool lag that made that higher "cost" than it may appear at first glance

Hi there! Help with looking for the best practice work on coroutines flow from swift. Any articles or github examples

Advance apologies, on this being a long one. I’m working on a KMM module and not strong with gradle. I’m trying to use the gradle XCFramework plugin in conjunction cocoapods for external dependency management, and I have several questions about how to make all the iOS pieces play together. Below is basically what the iOS outline of my gradle looks like (reduced to the relevant iOS bits)

import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget
import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework

val bitcode: String = if ("release".equals(configuration, true)) "bitcode" else "marker"
val iosFrameworkName = "FooFramework"

kotlin {
    
    val xcf = XCFramework(iosFrameworkName)

    ios {
        binaries.framework {
            xcf.add(this)
        }
    }

    val iosTarget: (String, KotlinNativeTarget.() -> Unit) -> KotlinNativeTarget = when {
        System.getenv("SDK_NAME")?.startsWith("iphoneos") == true -> ::iosArm64
        System.getenv("NATIVE_ARCH")?.startsWith("arm") == true -> ::iosSimulatorArm64
        else -> ::iosX64
    }
    iosTarget("ios") {}

    cocoapods {
        summary = "summary here"
        homepage = "<https://www.example.com>"
        ios.deploymentTarget = "10.0"
        podfile = project.file("../iosApp/Podfile")
        framework {
            baseName = iosFrameworkName
            freeCompilerArgs += listOf("-module-name", "FOO")
            embedBitcode(bitcode)
        }
        pod("AFNetworking", "~> 4.0.1")
    }

}

First question: Am I doing it wrong? 😀 Second question: Is it right to configure the framework (baseName, module-name, etc) inside the

cocoapods

extension instead of the

ios

target? Third question: When set up this way, the

iosTarget

workaround to for the IDE in conjunction with cocoapods reports exceptions about the x64 architecture already having a binary:

Cannot add binary podDebugFramework dependency to default fat framework
java.lang.IllegalArgumentException: This fat framework already has a binary for architecture `x64` (podDebugFramework for target `iosX64`)…

Cannot add binary podReleaseFramework dependency to default fat framework
java.lang.IllegalArgumentException: This fat framework already has a binary for architecture `x64` (podReleaseFramework for target `iosX64`)…

Even though things seem to build successfully, even with these pod<config>Framework exceptions, is there a possibility of a problem rearing its head? Is there something I can do to clean the exceptions up? references: Build XCFramework: https://kotlinlang.org/docs/mpp-build-native-binaries.html#build-xcframeworks iOS dependencies with CocoaPods: https://kotlinlang.org/docs/kmm-add-dependencies.html#with-cocoapods Note for iOS dependencies needing workaround to get code completion/highlighting in the IDE for the 3rd party libs https://kotlinlang.org/docs/kmm-add-dependencies.html#workaround-to-enable-ide-support-for-the-shared-ios-source-set

Hi everybody, I wonder if anyone has managed to use gRPC <> iOS with Kotlin Multiplatform, until now, we have had lots of issues, I found out that https://github.com/grpc/grpc-kotlin seems to be a pure Kotlin implementation but I haven't tried it for IOS Thanks

hello folks 👋 Let’s say I have an abstract class in Kotlin that is subclassed from Swift. This subclass is then instantiated and passed to Kotlin code. Is there a way to get Swift’s subclass name from Kotlin?

Does freezing typically occur only when objects are passed across thread boundaries? Or are there other cases?

For my Android app, I have ~60 app "variants", which each have a handful of key/value config options + a folder of assets specific to that variant... Any way to achieve something similar with org.jetbrains.gradle.apple.applePlugin?

How do you add iOS dependencies (e.g. cocoapods) to an app built with org.jetbrains.gradle.apple.applePlugin?