I have a kotlin fun defined in a KMP project with ...

# multiplatform

[Christopher Mederos]

I have a kotlin fun defined in a KMP project with an Int paramter -

fun getUser(userId: Int) {}

However, when I try to use this function in swift, I'm getting a type error -

Cannot convert value of type 'Int?' to expected argument type 'KotlinInt?'

Presumably I'm missing a step or config here? I'd assume that KMP magic handles the Int implementation in each platform without me having to write any additional mapping?

[Pablichjenkov]

You need to pass the swift type that maps your kotlin type. https://kotlinlang.org/docs/native-objc-interop.html#nsnumber
Oh wait, you are using the right type.
What if you pass an objective-c integer?

[Christopher Mederos]

I ended up adding a swift Int extension to handle the conversion, as per this article!
https://medium.com/cox-auto-tech-blog/navigating-seas-with-kmm-an-ios-developer-story-3791310e39eb

extension Int {
    /// converts this Integer to KotlinInt
        func toKotlinInt() -> KotlinInt {
            return KotlinInt(integerLiteral: self)
        }
}