Hello! I am stuck with the following problem: I am implementing NFC logic in kmp, I need to implement the protocol

NFCNDEFReaderSessionDelegateProtocol

from kotlin code. The problem is that this protocol was translated from OBJ-C to Kotlin like this:

public expect interface NFCNDEFReaderSessionDelegateProtocol : platform.darwin.NSObjectProtocol {
    @kotlin.commonizer.ObjCCallable public open expect fun readerSession(session: platform.CoreNFC.NFCNDEFReaderSession, didDetectTags: kotlin.collections.List<*>): kotlin.Unit { /* compiled code */ }

    @kotlin.commonizer.ObjCCallable public abstract expect fun readerSession(session: platform.CoreNFC.NFCNDEFReaderSession, didDetectNDEFs: kotlin.collections.List<*>): kotlin.Unit

    @kotlin.commonizer.ObjCCallable public abstract expect fun readerSession(session: platform.CoreNFC.NFCNDEFReaderSession, didInvalidateWithError: platform.Foundation.NSError): kotlin.Unit

    @kotlin.commonizer.ObjCCallable public open expect fun readerSessionDidBecomeActive(session: platform.CoreNFC.NFCNDEFReaderSession): kotlin.Unit { /* compiled code */ }
}

Meaning that there are two

readerSession

methods with the exact same signature, thus I am unable to implement all the abstract methods of this interface from Kotlin code

I was facing the same issue with the

CBCentralManagerDelegate

https://developer.apple.com/documentation/corebluetooth/cbcentralmanagerdelegate?language=objc The workaround I came up with: provide an Interface, that has all your callback Methods and some swiftcode has to implement the interface and calls them. In your case:

NFCNDEFReaderSessionDelegateProtocolInterface {
// the two you need
fun readerSessionDidDetectTags(session: platform.CoreNFC.NFCNDEFReaderSession, didDetectTags: kotlin.collections.List<*>)
fun readerSessionDidDetectNDEFs(session: platform.CoreNFC.NFCNDEFReaderSession, didDetectTags: kotlin.collections.List<*>)
// for consistency
fun readerSessionDidInvalidateWithError(session: platform.CoreNFC.NFCNDEFReaderSession, didInvalidateWithError: platform.Foundation.NSError)
fun readerSessionDidBecomeActive(session: platform.CoreNFC.NFCNDEFReaderSession)
}

Let your Switftcode inherit these methods and call them when the swift

func

gets called. And eventually inject that class which implemented NFCNDEFReaderSessionDelegateProtocolInterface into your shared code.

yeah your solution seems to be the only possible solution here, I wanted to avoid adding code from client side but seems like I don't have any other choice. Thank you Anton

@Federico Torres https://kotlinlang.slack.com/archives/C3SGXARS6/p1699101675161829?thread_ts=1699101675.161829&cid=C3SGXARS6 I haven't tried but looks promising.