hasRoot / isRoot crashes app

[emartinson]

Hi! I've adapted example app to handle deeplink, but app crashes when trying to get current coordinator:

final class AppCoordinator: NavigationCoordinatable {
    var stack: Stinsen.NavigationStack<AppCoordinator>

    @Root var unauthenticated = makeUnauthenticated
    @Root var authenticated = makeAuthenticated

    init() {
        let user = User() // obtaining user from persistent store
        stack = NavigationStack(initial: \AppCoordinator.authenticated, user) // this is also handled by auth state listeners
    }

     func makeUnauthenticated() -> NavigationViewCoordinator<UnauthenticatedCoordinator> {
        NavigationViewCoordinator(UnauthenticatedCoordinator())
    }

    func makeAuthenticated(param user: User) -> NavigationViewCoordinator<MainCoordinator> {
        NavigationViewCoordinator(MainCoordinator(user: user)) // MainCoordinator is a simple navigaion view coordinator
    }

    func handleDynamicLink(_ url: URL) {
        guard let coordinator = self.hasRoot(\.authenticated) else { // <-- Crashes here.  self.isRoot(\.authenticated) causes the same crash
            return
        }
    }
}

Crash in NavigationCoordinatable.swift, line 661, col 21

Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

Printing description of route: <ReferenceWritableKeyPath<AppCoordinator, Transition<AppCoordinator, RootSwitch, User, NavigationViewCoordinator>>: 0x280687280> Printing description of inputItem: nil

((input: App.User, comparator: ())?) inputItem = nil Printing description of self: <AppCoordinator: 0x283d59500>

App and coordination logic works perfectly, but this check on AppCoordinator level causes the crash.

It looks that unwraping var root: NavigationRoot! from NavigationStack (NavigationStack.swift, line 29) causes the crash. What is the reason for this crash and how to solve it?

Stinsen (2.0.7) MacOS 12.6, XCode 14 Release, iOS 15-16

[emartinson]

Hi, any updates here? Maybe there are other ways to check if we're currently presenting this screen? Or mark some routes as exclusive (may be showed only once at a time)