I am trying to call a Kotlin function that might throw an exception from Swift code. My goal is to retry this operation until it does not throw an exception anymore. To do that, I have added an

@Throws

annotation on the Kotlin side and now wrapped the Swift side with a

do {
    try await operation()
} catch let e as NSError {
    ...
}

block. Catching the exception kind of works as I can see logs from inside the catch block, but my app still crashes from the already caught and handled exception, saying that it is uncaught. Why is that happening?

Is there anything unconventional about how SKIE subscribes to Flows, when using the SwiftUI

Observing

View? Asking because I have a perplexing result... The view receives emissions if I start the Flow

SharingStarted.Eagerly

, but if I set it to

WhileSubscribed

it never starts... So is

Observing

subscribing or not 🤔

Hi guys, I am implementing a map in my application with markers, which are SVG images, and I am having a performance problem. Most of the markers need to be shown in black and white, not colored. I have around 300 markers, where 280 more or less are like that. The problem is that in the first execution of the screen, the iPhone uses around 250 MB memory, it creates the markers, resize them and make them black and white. If I leave the screen and come back to it a couple of times, the memory usage raises to 2GB and the app crahses. If I don't make them black and white it does not happen and the memory stays in 250-300 mb. Is there any optimized way to fix this problem? A different way to make images black and white or release non used resources when I leave the screen? I explain more details of the implementation in the thread.

thank you. But this does not talk about how to use the WhileSubscribed method?

Hello Everyone, I have compose multiplatform android/ios app. iOS app size 83 MB how I decrease this size? The cocoapods libraries are : [Maplibre, FirebaseCore, FirebaseMessaging], other one only kotlin common libraries

Hello again my compose multiplatform ios app sometimes ui freezing when I call http request in the viewModel but same code is working fine in android. How I can fix this problem?

Hey everyone, on my app in iosMain folder I would love to detect if user use wifi, cellular or ethernet. on iOS i can just create

NWPathMonitor

and listen to enum changes

NWInterface.InterfaceType

. But I can’t do that on KMP side? Anyone have any tips here?

Hello in our KMP project we are seeing extremely high build times. Of order of 30-40 minutes. We are trying to figure practices to reduce the build times. Part of the reason the build time is so high is because we are building out both x86 and arm flavors. Removing one of them only reduced build time by half. What other ideas we can implement to reduce build time? Is modularizing a good idea? I know iOS doesn’t support importing multiple frameworks built on kmp. But would just splitting into many modules help? Still package them into umbrella framework. Anyone has thoughts?

On Android we have some code that, if some request fails while say offline, kicks off Worker to run as soon as network connection available (and that will run whether app is in foreground or background). I know you can setup background tasks on iOS but doesn't see to offer quite same functionality (and very undeterministic when task will actually run!). Is anyone using any particular approach on iOS for this?

How can we access the AVPlayer FullScreen close button?

I'm trying to use a variable font on a label in UIKitView, but the variations are not applying. What could I be doing wrong?

Does anyone know how can I read the custom data sent in APN payload (push notification) while app is started from inactive state? Preferrably in kotlin. I've tried to catch it in

AppDelegate

(didFinishLaunchingWithOptions, didReceiveRemoteNotifications) and

UNUserNotificationDelegate

on kotlin side as well as in swift but with no luck. 🤔 This is a case of user opening app by tapping notification when app was closed completly (not in background)

Hey! I am working on integrating SwiftCode (CryptoKit) to my Kotlin Multiplatform Project but somehow I just can't do it. There is an example of

SwiftChachaPoly

on the internet but it's outdated. Here is my error and Gradle File. Error Message

Exception in thread "main" java.lang.Error: /var/folders/4m/c90drcr50gsghb8p86fnn51r0000gp/T/17669576026474868801.m:1:10: fatal error: 'AppleBridge/AppleBridge-Swift.h' file not found

Failed to generate cinterop for :shared:cinteropAppleBridgeIosArm64: Process 'command '/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java'' finished with non-zero exit value 1

:shared:iosArm64Main: cinterop file: /Users/patrykdrozd/Programing/dms-agent/shared/build/libs/shared-iosArm64Cinterop-AppleBridgeMain-1.0.0.klib does not exist

etc

Gradle File

listOf(
    iosArm64(),
    iosSimulatorArm64(),
).forEach {
    it.binaries.framework {
        baseName = "shared"
        isStatic = true
        binaryOption("bundleId", "shared")
    }

    val platform = when (it.name) {
        "iosArm64" -> "iphoneos"
        "iosSimulatorArm64" -> "iphonesimulator"
        else -> error("Unsupported target ${it.name}")
    }

    it.compilations.getByName("main") {
        cinterops.create("AppleBridge") {
            val interopTask = tasks[interopProcessingTaskName]
            interopTask.dependsOn(":AppleBridge:build${platform.replaceFirstChar(Char::titlecase)}")
            includeDirs.headerFilterOnly("$rootDir/AppleBridge/build/Release-$platform/include")
        }
    }
}

AppleBridge.def File

language = Objective-C
package = swift.appleBridge

headers = AppleBridge/AppleBridge-Swift.h
headerFilter = AppleBridge/*

staticLibraries = libAppleBridge.a
libraryPaths.ios_x64 = AppleBridge/build/Release-iphonesimulator
libraryPaths.ios_simulator_arm64 = AppleBridge/build/Release-iphonesimulator
libraryPaths.ios_arm64 = AppleBridge/build/Release-iphoneos

linkerOpts = -L/usr/lib/swift
linkerOpts.ios_x64 = -ios_simulator_version_min 13.0 -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator/
linkerOpts.ios_simulator_arm64 = -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator/
linkerOpts.ios_arm64 = -iphoneos_version_min 13.0 -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos/

Update I found that my Xcode project doesn't create folder with a header

Debug-iphoneos/include/*-Bridging-Header.h

What do folks use for looking at application logs for an iOS app when not connected to the debugger? I've tried

idevicesyslog

for example but not showing the logs for some reason

I started getting those weird errors today

Undefined symbols for architecture arm64

. Anybody knows how to resolve this? I did not change anything and the build ran fine yesterday 🤔

Hey! Did anyone tried to use https://github.com/apple/swift-certificates inside KMP?

Has anyone managed to squeeze KMP into an App Clip? Seems like a tall task given the overheads of KMP and the 15MB limit if you go for the QR only approach.

Long standing workflow issue for me with Kotlin Multiplatform for iOS... When I build for iOS device in Xcode, resulting

shared

Kotlin symbols are visible and navigable from Xcode ✅ When building for simulator in Xcode, compilation result remains correct, but Kotlin symbols are unresolvable to the Xcode IDE 🙅 Is there some search path or configuration that can be added to enable awareness of symbols from simulator build paths?

Hey, I am trying to use Swift

thows

with kotlin. Swift

@objcMembers public class AESCryptoBridge: NSObject {
    public func test() throws {
        throw CryptoError.invalidData
    }
}

On Kotlin I have access to NSError but I have no idea how to use is. Is there any resource that will explain me how to work with?

AESCryptoBridge().testAndReturnError("I have no idea how to use NSError Pointer here")

I found this code but alloc is deprecated if I am correct

val errorPointer: CPointer<ObjCObjectVar<NSError?>> = alloc<ObjCObjectVar<NSError?>>().ptr

Update: I found the solution 🙂

val error = memScoped {
    allocPointerTo<ObjCObjectVar<NSError?>>()
}
AESCryptoBridge().testAndReturnError(error.value)

Hi all, what's the minimal boilerplate code way to define an actual implementation of an expect class straight in swift?

Hello, a big tip about the completion issue with Xcode. If you’re using custom Xcode configuration (more than Debug/Release), it’s breaking SOURCE_KIT. For fixing this issue, add next to your Compile Kotlin Framework - Build phase. •

cd "${SRCROOT}/../shared/build/xcode-frameworks/"

(or any other path to the shared framework •

ln -Fs "${CONFIGURATION}" "Debug"

A Debug directory is mandatory for SOURCE_KIT to work!

If I have a Kotlin interface with functions or variables that have a body and which I don't want to override, when implementing it in Swift, it requires me to still override everything.

It could be a naive question. Is there a support for adding the breakpoint in kotlin code and debug in xcode? If not then how others are debugging the code? What other solutions are there for the same?

Is there a way to properly export a UByteArray type in an interface to Swift? Unlike a normal ByteArray it just turns into Any instead of KotlinByteArray.

👀 KMP Classes not visible in Swift by default 👀 Sometimes I face the issue that classes defined in KMP shared code are not visible in Swift. I work around this issue by adding a “fake usage” to the

MainViewController.kt

class like below. Afterwards I can access

IOSPlatformFile

in Swift code.

fun MainViewController() = ComposeUIViewController { App() }

// so swift code can access this
val platformFile: IOSPlatformFile = IOSPlatformFile("")

Could someone clarify what I’m doing wrong in these cases? Are only classes from the main module visible to Swift by default?

I don't know if it's offtopic or not but I need iOS Device Support files for 18.5 (22F5053f). Would be grateful for any help

Hi , Team I am working on BLE iOS application. While reading the data from BLE device continuously, I am getting below crash Message from debugger: Terminated due to signal 9 Note: app running in background. Any suggestions on how to resolve it? Thanks, GNKumar.

Is there anything I can do to make

embedAndSign

run faster (besides buy new computer)? I'm not using cocoapods nor SPM, only kotlin (and minimum swift boilerplate) yet full ios build still takes 20-30 minutes (macbook M3 16GB ram) *embedAndSign takes >50% of that time

Hey, I am using

kotlin native cocoapods

. I have few questions. 1. Why kotlin native cocoapods plugin automatically creates podspec file upon sync. 2. If i use some cocoapods dependency and like Alamofire. I can define in gradle inside cocoapods block. Upon gradle sync podInstall task is ran by gradle. Then kotlin files of those pods are generated from cocoapods package. This later compiled with the final fat-framework. We can use this framework in any ios app. If so why we need to create a pod file in iosApp and run pod install there as well?

Hey, sorry if this is a stupid question as I don't know much about iOS development. When I use "jump to definition" in XCode on a (KMP) method or class from code, it will jump to that (basically) unreadable generated header file. However if I do the same on the module import it does show that header in a more human readable format, is there a flag or setting I forgot that parses all those

swift_name

attributes?