I want to use SwiftUI `ForEach` on an `KotlinArray` , but I get `Generic struct 'ForEach' requires...

# multiplatform

[Stefan Oltmann]

I want to use SwiftUI ForEach on an KotlinArray , but I get Generic struct 'ForEach' requires that 'KotlinArray<MyType>' conform to 'RandomAccessCollection' .
Is there any compatiblity layer build in for that?

[louiscad]

Can't you make it conform to that RandomAccessCollection protocol via a Swift extension?

[Stefan Oltmann]

Not sure how. 🤷‍♂️

As a workaround I now will convert it "toList()" and write that into a variable.

[louiscad]

Search how to implement a protocol via a Swift extension on Google and I'm pretty sure you'll find out. Converting to a list is fine as well.

[Sam]

Make a swift file and in that file add something like the following
extension KotlinArray<T>: RandomAccessCollection {}
That should get you started. It's possible that you won't be able to do that with a generic T and will need to specify your class directly. Generics and protocols can be finicky.

[ankushg]

Thanks for that tidbit @Sam!

I'm curious if anyone has put together a collection of these kinds of utilities to make Kotlin/Swift ergonomics a bit better… it might be tricky to package and redistribute though