<@UNKMT11L3> quick question, when using Kotlin 2.3...

# swift-export

[Guilherme Delgado]

@Artem Olkov quick question, when using Kotlin 2.3.0-RC (and up), should we except swift primitive types - even if we run embedAndSignAppleFrameworkForXcode?

[Artem Olkov]

that depends 🙂 what kotlin code do you have in mind?

[Guilherme Delgado]

I ask because I’m seeing this:

open class KotlinLong : KotlinNumber {

    public init(value: Int64)

    public convenience init(longLong value: Int64)
}

open class KotlinBoolean : KotlinNumber {

  public init(value: Bool)

  public convenience init(bool value: Bool)
}

public class GradientScreenUIViewController : KotlinBase {

  public convenience init()

  open class var shared: GradientScreenUIViewController { get }

  open func make(randomize: @escaping (KotlinLong) -> Void) -> UIViewController

  open func update(state: ScreenState)
}

public class TestScreenUIViewController : KotlinBase {

  public convenience init()

  open class var shared: TestScreenUIViewController { get }

  open func make(value: Bool) -> UIViewController
}

[Guilherme Delgado]

GradientScreenUIViewController uses KotlinLong but TestScreenUIViewController uses Bool

[Guilherme Delgado]

I was expecting it to be KotlinBoolean

[Guilherme Delgado]

My generated code:

public struct TestScreenRepresentable: UIViewControllerRepresentable {
    let value: KotlinBoolean

    public func makeUIViewController(context: Context) -> UIViewController {
        TestScreenUIViewController().make(value: value)
    }

    public func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
        //unused
    }
}

will fail because the exported framework asks for Bool instead of KotlinBoolean in .make(value: value)

[Artem Olkov]

With Objective-C export it's OK to see Kotlin*. It is used each time the type should(may) be boxed. In your example it was used because it is a parameter inside an escaping closure (btw, probably may be used w/o boxing, probably can be reported as a bug)

I would say that this doc (and neighbouring articles) covers this quite well.

[Guilherme Delgado]

Correct, in that .md you can see that the expected type for Boolean should be Boolean? -> KotlinBoolean?

[Guilherme Delgado]

I also consulted this: https://kotlinlang.org/docs/apple-framework.html#kotlin-numbers-and-nsnumber

[Guilherme Delgado]

and this (for swift export): https://github.com/JetBrains/kotlin/blob/master/docs/swift-export/language-mapping.md#built-in-types

[Artem Olkov]

Yes, and for non optional type - Bool is expected 🙂

[Artem Olkov]

and this (for swift export

But your project doesn't use swift export?

[Guilherme Delgado]

this specific one is not exporting with swift export, is using embedAndSignAppleFrameworkForXcode. And if I use it inside a closure:

public class TestScreenUIViewController : KotlinBase {

  public convenience init()

  open class var shared: TestScreenUIViewController { get }

  open func make(value: Bool, otherValue: @escaping (KotlinBoolean) -> Void) -> UIViewController
}

the type is expected.

[Artem Olkov]

Oh, 2 question

1. do you see this behaviour on compile time, or inside AS?
2. Was it working the other way around before 2.3?

[Guilherme Delgado]

actually i cannot see the result framework in AS, I don’t know if it is a bug, with Xcode I can see it.

[Guilherme Delgado]

it’s compile time, when I build the project and go inside the import to see the resulting framework

[Guilherme Delgado]

I think it was working as I expected, I don’t know when started failing.

[Guilherme Delgado]

perhaps 2.3.0-RC?

[Guilherme Delgado]

I’ll investigate 😉

[Artem Olkov]

I’ll investigate

Thanks! If it was working on 2.2.21 as you expect - please file a ticket for that, as is it definitely a problem

[Guilherme Delgado]

Tested with 2.2.21 and 2.2.20 and the result is:

public class SampleData : KotlinBase {

  public init(v1: Bool)

  open func doCopy(v1: Bool) -> SampleData

  open func isEqual(_ other: Any?) -> Bool

  open func hash() -> UInt

  open func description() -> String

  open var v1: Bool { get }
}

public class MainKt : KotlinBase {

    open class func ExportTestFun(v1: Bool, v2: @escaping (KotlinBoolean) -> Void, v3: SampleData)

    open class func MainViewController() -> UIViewController
}

For the input:

data class SampleData(val v1: Boolean)

fun ExportTestFun(v1: Boolean, v2: (Boolean) -> Unit, v3: SampleData){
}

[Guilherme Delgado]

so I’ll have to take this into account in my KSP 😅

[Guilherme Delgado]

Yup, my fault — some corner cases weren’t considered due to my lack of knowledge. Sorry for the false positive 😅