Hello, when I use native library for iOS in KMM, I...

# multiplatform

[Charles Jo]

Hello, when I use native library for iOS in KMM, I used cinterop to generate kotlin binding codes. But for delegation that is implemented by Objective-C is converted to Kotlin interface based on NSObjectProtocol type. But when I try to implement this interface on KMM iOS code, it requires to implement many unnecessary functions like hash, equal, etc. But the problem is that even when I override all the functions, I still see the following issue.
Internal error occurred while analyzing this expression: InvalidCardinalityException: Container: LocalClassifierAnalyzer: Request interface org.jetbrains.kotlin.builtins.PlatformSpecificCastChecker cannot be satisfied because there is more than one type registered Clashed registrations: Instance: NativePlatformSpecificCastChecker, Instance: NativePlatformSpecificCastChecker, Instance: NativePlatformSpecificCastChecker

This is exmaple delegate definition in Objective-C header file
@protocol TestDelegate NSObject
@required
- (void) onTest:(Test *)testObj scanData:(NSString *)scanData;
@end

And converted Kotlin binding code is like this
@kotlinx.cinterop.ExperimentalForeignApi public expect interface TestDelegateProtocol : platform.darwin.NSObjectProtocol {
@kotlin.commonizer.ObjCCallable public abstract expect fun onTest(testObj: com.example.proj.Test?, scanData: kotlin.String?): kotlin.Unit
}

[Michael Krussel]

I think you probably want to inherit from NSObject for the class that is implementing the protocol.

[Charles Jo]

But it’s generated by cinterop

[Charles Jo]

Do you have any idea of inherift from NSObject?

[Michael Krussel]

class MyTestDelegate : NSObject(), TestDelegateProtocol {}

[Charles Jo]

Wow, thanks. Build is okay, Let me check feature.