Hello, I have the following issue with state preservation on iOS. The app fails at runtime with the ...

# decompose

[Pavel S]

Hello, I have the following issue with state preservation on iOS. The app fails at runtime with the error below (full trace in the thread)

kfun:kotlin.Throwable#<init>(kotlin.String?){} + 123 
kfun:kotlin.Error#<init>(kotlin.String?){} + 119 
kfun:kotlin.NotImplementedError#<init>(kotlin.String){} + 119 
kfun:com.arkivanov.parcelize.darwin.NotImplementedCoding#objc:encodeWithCoder: + 219

when navigating from the app with some entries in the navigation stack, when the following method in AppDelegate is called

func application(_ application: UIApplication, shouldSaveSecureApplicationState coder: NSCoder) -> Bool {
        let savedState = rootHolder!.stateKeeper.save()
        CodingKt.encodeParcelable(coder, value: savedState, key: "savedState")
        return true
    }

I’m using Essenty 1.1.0, parcelize-darwin plugin 0.1.4.
What might be the cause of it?

[Pavel S]

full trace.txt

full trace.txt

[Arkadii Ivanov]

Glad you are trying the state preservation on iOS! Have you applied the parcelize-darwin plugin? See the docs: https://arkivanov.github.io/Decompose/component/state-preservation/#darwin-apple-targets-support

[Pavel S]

Yes, the plugin is applied in the shared module and dependencies are exported to framework as follows

export(libs.essenty.state.keeper)            export(libs.parcelize.darwin.runtime)

[Arkadii Ivanov]

Unfortunately, the stack trace points to something like knbridge3 which doesn't provide any useful information. It looks like the plugin is not applied in the module where that Parcelable class is located, or @Parcelize annotation is not added on that class, or the compiler plugin failed to discover that class.

[Pavel S]

Thanks, this seems to be the issue

[Arkadii Ivanov]

Please let me know what the issue was. Could be useful in the future.

[Pavel S]

The Parcelable class was located not in the module where parcelize-darwin plugin was applied