Is there something I can do to make

fun sectionForIndex(index: Int): Section?

not compile to

Int32

in my objective-c framework?

Change it to:

fun sectionForIndex(index: Long): Section?

Is this intentional design by Jetbrains?

Kotlin Ints are 32-bit whereas Swift integers are 64-bit on 64-bit platforms.

doh, okay. thank you

Beware of that if you plan on targeting older iOS devices/versions as it will cause some pain. For the most part 32-bit iOS stuff has been dead for long enough that it isn’t hard to justify not supporting it.

Good catch!

I’m not aware of any.

Would be a big page. I kid.

Gotcha #1: using experimental, unreleased frameworks

What, mutliplatform? Experimental, maybe, but not unreleased.

unreleased was probably too strong of a joke, but that's interesting about native.

The platform is “stable” in the sense that the runtime is OK. There’s definitely a few surprises, though. All improving over time.

@Sam Long semi-works, but now it requires an

Int64

wrapper. Was this what you expected?

There’s some info about primitive numbers interop between Kotlin <-> iOS (https://kotlinlang.org/docs/reference/native/objc_interop.html#nsnumber). Looks like you can pass in an

NSNumber

object instead.

It isn’t quite the way I remember it working no.

If the type you’re expecting is an Int or Long, you can’t pass in NSNumber. That’s for a different situation (I assume. Too late/tired to try to make an example). I’m pretty sure you do need to explicitly cast to Int64. Not ideal, but you know. It works. I’ve been mostly passing objects in/out, so I’m a little rusty on how primitives work.

@kpgalligan thanks for the sanity check. If it's the way it is, that's fine, it does work after all, but it's good to hear that's apparently the common solution.