Is there an example of a full Kotlin MPP Mobile project? I mean Gradle Kotlin DSL, Android & iOS...

# multiplatform

[ribesg]

Is there an example of a full Kotlin MPP Mobile project? I mean Gradle Kotlin DSL, Android & iOS app with 100% Kotlin

[ribesg]

I’m still not sure if that’s even possible or viable. Can you use Swift dependencies in an Kotlin iOS app?

[BenDLH]

That's exactly what I'm stuck on. It looks like you can but I have no idea how: https://github.com/JetBrains/kotlinconf-app/blob/master/common/src/iosMain/kotlin/org/jetbrains/kotlinconf/storage/PlatformSettings.kt

[BenDLH]

See the import

import platform.Foundation.*

[ribesg]

That’s what I understood but I find the lack of resources and example very weird

[ribesg]

And it’s nice with Foundation but could I do

import platform.RxSwift

or something like that? What would be responsible for managing this dependency? Do I need to have both Carthage and Gradle?

[BenDLH]

Yeah exactly. All examples stop at calling Kotlin from Swift, which looks to be "relatively" easy. But examples of calling Swift from Kotlin are no where to be found

[BenDLH]

Found this: https://kotlinlang.org/docs/tutorials/native/interop-with-c.html

[ribesg]

I’m reading things about Kotlin Native not supporting Swift, so libraries which are not working when called from an ObjC project would not work in Kotlin Native

[BenDLH]

Yeah that makes sense I suppose, that's why you need the @objc annotation on any swift classes you want to access

[BenDLH]

https://kotlinlang.org/docs/reference/native/objc_interop.html

[ribesg]

I found this https://kotlinlang.org/docs/reference/native/gradle_plugin.html

This document describes Kotlin/Native experimental Gradle plugin, which is not the plugin yet supported by IDE or in multiplatform projects

[BenDLH]

Yeah but C interop must be supported as it's found in the sample projects

[BenDLH]

Are you on a mac?

[ribesg]

Yes

[ribesg]

I just found this https://github.com/JetBrains/kotlinconf-spinner/tree/master/clients

[BenDLH]

Just ran the demo project I have and it looks like the first build causes the multiplatform gradle plugin to download and link the iOS platform imports. Try building and you should be able to import platform.* classes, which are iOS platform Objc classes

[BenDLH]

Kotlin can't communicate directly with Swift, but exporting Swift code to Objc can be accessed by Kotlin

[ribesg]

The repo I linked doesn’t use the MPP plugin, right?

[BenDLH]

No, that's link is for creating Kotlin libraries to be used by Native/C code only

[ribesg]

Well I’m not sure, this looks like a Kotlin iOS app using share Kotlin code https://github.com/JetBrains/kotlinconf-spinner/tree/master/clients/ios

[ribesg]

But it’s not a kotlin-multiplatform project, just multiple gradle projects