AppRoutes.kt

enum class AppScreen(
    routeFormat: String,
    override val annotations: Set<RouteAnnotation> = emptySet(),
) : Route {
    Home("/app/home"),
    PostList("/app/posts?sort={?}"),
    PostDetails("/app/posts/{postId}"),
    ;

    override val matcher: RouteMatcher = RouteMatcher.create(routeFormat)
}

BallastNavigationSwiftUi.swift

import Combine
import SwiftUI
import shared

struct BallastNavigationView: View {

    @ObservedObject var vm = BallastObservable<
        RouterContract.Inputs<AppScreen>,
        RouterContract.Events<AppScreen>,
        RouterContract.State<AppScreen>
    >(
            viewModelFactory: { IosRouterViewModel() },
    )

    var body: some View {
        BallastNavigationViewContent(
            vmState: observableModel.vmState,
            postInput: observableModel.postInput
        )
        .withViewModel(vm) {
            vm.activate()
        }
    }
}

struct BallastNavigationViewContent: View {
    var vmState: ExampleContract.State
    var postInput: (ExampleContract.Inputs) -> Void

    var body: some View {
        RoutingUtilsKt.renderCurrentDestination(
            route = { match, route ->
                switch route { 
                    case .Home: 
                        HomeView()
                    case .PostList: 
                        PostListView(
                            match.queryParamters["sort"]
                        )
                    case .Home: 
                        PostDetailsView(
                            match.pathParamters["postId"]
                        )
            },
            notFound = { NotFoundView() }
        )
    }
}

IosRouterViewModel.kt

class IosRouterViewModel() : IosViewModel<
  <RouterContract.Inputs<AppScreen>,
   RouterContract.Events<AppScreen>,
   RouterContract.State<AppScreen>
  >(
    config = BallastViewModelConfiguration.Builder()
        .withRouter(RoutingTable.fromEnum(AppScreens.values()), AppScreens.Home)
        .build(),
)