Hello Guys, I want to build my KMPP iOS sources into an iOS static library, and my iOS kotlin code uses some ObjC classes from another iOS framework, which are accessed using cinterop. When my ObjC app code (

ViewController.m

) calls iOS kotlin function (

KmppBootstrap.test

, built to iOS static library), which accept an ObjC object (

IOSDummyObj

from

IOSDummyFramework.framework

), if

KmppBootstrap.test

use

IOSDummyObj

, my app will crash at

Kotlin_Interop_refToObjC

with

EXC_BAD_ACCESS (code=1, address=0x1a102ba0120)

, but if

KmppBootstrap.test

don't, my app runs fine. Could you guys please help me, thanks! I upload my repro project onto GitHub, in the

ios_static_lib_repro

branch of https://github.com/Piasy/KmppBootstrap , my iOS kotlin code is mainly

kmpp/src/iosMain/kotlin/com/piasy/kmpp/KmppBootstrap.kt

, and iOS app is under

iOSExample2/iOSExample2/ViewController.m

. Or maybe my app code is wrong?

IOSDummyObj* obj = [[IOSDummyObj alloc] initWithInt:42];

    libkmpp_ExportedSymbols* lib = libkmpp_symbols();

    libkmpp_kref_com_piasy_kmpp_KmppBootstrap kmpp = lib-><http://kotlin.root.com|kotlin.root.com>.piasy.kmpp.KmppBootstrap.KmppBootstrap();

    libkmpp_kref_Dummy_IOSDummyObj dummy;
    dummy.pinned = (__bridge libkmpp_KNativePtr)(obj);
    lib-><http://kotlin.root.com|kotlin.root.com>.piasy.kmpp.KmppBootstrap.test(kmpp, dummy);

Hello! Can you please extend the repro project with some additional instructions? Unfortunately, I cannot make it work as you described here.

Hi Artyom, thanks for your reply! at first, you can download the repro branch with this url: https://github.com/Piasy/KmppBootstrap/archive/ios_static_lib_repro.zip then you can unzip it, and open the

iOSExample2.xcodeproj

under

iOSExample2

folder, sorry that it was ignored, I just commit it. Then after you run it in iPhone device, it would crash. If you change kotlin code, then you need run

./gradlew :kmpp:linkDebugStaticIos && cp kmpp/build/bin/ios/debugStatic/libkmpp.a libs/iOS/ && cp kmpp/build/bin/ios/debugStatic/libkmpp_api.h libs/iOS/

.

FYI: This discussion seems relevant: https://github.com/JetBrains/kotlin-native/issues/1395

@Artyom Degtyarev [JB] Thanks, I'll check it out.

Yes, AFAIK thats the best option here. I’ll ping you if something else can be done, but for now I would recommend this approach.

okay, thank you very much!

II managed to do it like described here(https://kotlinlang.slack.com/archives/C3SGXARS6/p1565279186194700?thread_ts=1565203926.191700&cid=C3SGXARS6). Assuming existance of

IOSDummyObj(dict: NSDictionary)

constructor, I’ve made a wrapper like:

fun wrappedInit(dict: CPointer<*>){
	IOSDummyObj(interpretObjCPointer<NSDictionary>(dict.rawValue)))
}

and called it from Objective-C as

NSDictionary* dict = [NSDictionary alloc];
  dict = @{ @“firstInt”  : @2,
            @“secondInt” : @2,
  };
 lib-><http://kotlin.root.com|kotlin.root.com>.piasy.kmpp.KmppBootstrap.wrappedInit(kmpp, (__bridge void *)(dict));

I think it can be done even prettier, but I am no expert in this particular case 😅.

Okay thanks! I'll try it later.

Make a wrapper method

iterate

, I suppose. Nothing is exposed to the library API by default.

Okay, thanks! I'll try that.