Hello there I am currently experimenting with cros...

# swift-export

[Dmitry Stakhov]

Hello there
I am currently experimenting with cross-language inheritance with 2.4.20
For the similar code:

// Kootlin
interface MyKotlinController {
    fun handle()
}
// Swift
class MySwiftController: KotlinBase, MyKotlinController {
    func handle() {
    }
}
let controller = MySwiftController()

I have the compilation error:
'init()' is unavailable
Does anyone have ideas?

[Rick Clephas]

Hey! This is a known issue. Please keep an eye on
https://youtrack.jetbrains.com/issue/KT-88251

[Artem Olkov]

I'll just highlight that there is a workaround - one can define a new open class that would be used as inheritance base - like this issue demonstrates. There is a bug in this approach, also listed in that issue 🙂 The good news - it works as expected in release mode.

[Dmitry Stakhov]

@Artem Olkov Thank you for the workaround idea, but unfortunately it doesn't work in my case:

@objcMembers final class MySwiftController: SwiftBase, MyKotlinController {
   ...
}

Implicit initializer 'init()' with Objective-C selector 'init' conflicts with initializer 'init()' from superclass 'KotlinBase' with the same Objective-C selector

[Artem Olkov]

Just out of curiosity - What drove you to write @objcMembers ? If there is a suggestion to do that somewhere in our docs I would love to remove that.

I've just added the example from the docs here - github.com/Kotlin/swift-export-sample/…/inheritance_demo

It works both in release and debug modes.

[Dmitry Stakhov]

I need to double check, but as I remember it's needed to call the controller from ObjC code (we still have a lot of legacy objective C in our iOS app project)