Is there any way of doing something like this On common.kt ```expect fun foo(font: UIFont)``` I mea...

# multiplatform

[Christian Sousa]

Is there any way of doing something like this

On common.kt

expect fun foo(font: UIFont)

I mean, having some platform specific parameter on the expect?
Or do I have to resort to use Any ?

Thanks!

[russhwolf]

You could also expect/actual the parameter

[Christian Sousa]

Like this @russhwolf?

expect fun foo(expect font: UIFont)

[russhwolf]

no, like

expect fun foo(font: Font) 
expect class Font

[Christian Sousa]

And is there any way of then on the iOS side for example do something like

actual class Font = UIFont

?

[Christian Sousa]

Because I want to use a class that already exists on the iOS/Android side

[russhwolf]

yeah that's exactly what you'd do

[Christian Sousa]

It gives me the following: Expecting a top level declaration

[Christian Sousa]

on the AndroidMain

[russhwolf]

Are you not doing a top-level class?

[Christian Sousa]

I’m declarating it inside my androidMain/actual.kt

[russhwolf]

oh sorry. You want to do actual typealias Font = ...

[Christian Sousa]

Why the typealias? Just curious

[russhwolf]

You're typaliasing Font to the platform-specific type

[russhwolf]

actual class defines a new class

[Christian Sousa]

Oh.. and should I do on the expect class Font as well?

[russhwolf]

no that's still expect class

[Christian Sousa]

Yeah, got it!

[russhwolf]

Some examples in the docs here https://kotlinlang.org/docs/reference/platform-specific-declarations.html

[Christian Sousa]

By the way, and somewhat unrelated. But is there a way of overloading expected methods and using an OptionalExpectation?

Something like:

@OptionalExpectation
expect fun foo(bar: String)

@OptionalExpectation
expect fun foo(foo: String)

And then on the platform specific only implementing the one we want? For example the first one being for Android and the second one for iOS

[russhwolf]

No, @OptionalExpectation only works for annotations

[russhwolf]

Otherwise you might try to call that function from common and not know it's missing

[Christian Sousa]

Yeah, thats what I thought. Thanks a lot for your help!