I cannot get Kotlin native working with the new Sw...

# kotlin-native

[Thomas]

I cannot get Kotlin native working with the new SwiftUI. The app works fine in the simulator, but if I want to see a preview in Xcode I get this error:

Terminating app due to uncaught exception 'NSGenericException', reason: 'Only one Kotlin framework can be loaded currently'
terminating with uncaught exception of type NSException

[Thomas]

Here is the crash log from Xcode: https://gist.github.com/Thomas-Vos/8d8e51f254d77e4f65a572ac9cabacdf

[gildor]

I’m not really sure how this rrelated to SwiftUI and how preview works, K/N allows only one K/N framework per app, so you cannot write 2 k/n frameworks and include them to single application, you have to merge them

[Thomas]

@gildor this is related to the SwiftUI preview. I only have one K/N framework, the app in the simulator works fine. It is just that the preview in Xcode is not working.

[gildor]

Probably it’s some sort magic on preview

[gildor]

what you exactly doing? Do you try to use K/N frameowrk in a project with SwiftUI?

[Thomas]

Yes. I have a current iOS project with K/N. I changed the iOS deployment target to 13.0. Then I added a SwiftUI file using Xcode and the preview crashes.

[gildor]

I see, interesting

[Sam]

It could be a bug in the Xcode beta. Maybe it is trying to load your framework twice.

[svyatoslav.scherbina]

Can’t reproduce.
Could you share your project and steps to reproduce the bug?

[Thomas]

@svyatoslav.scherbina Yes, of course. I created an issue on GitHub, with a link to a sample project. It looks like it is related to the CocoaPods plugin. Are you able to reproduce the issue with this project? https://github.com/JetBrains/kotlin-native/issues/3059

[svyatoslav.scherbina]

Thanks! We will check it in a few days.