With Navigation Compose. When I select a tab, and ...

# compose

[Frank van der Laan]

With Navigation Compose. When I select a tab, and follow the documentation, I do this:

popUpTo(navController.graph.findStartDestination().id) {
    saveState = true
}

as a result, my tab's ViewModels is not cleared when switching tabs. That's good. But let's say the user now logs out and I want to clear this ViewModel after all. How do I do so? Popping all screens from the backstack will clear all their ViewModels, but this screen is not in the backstack anymore.

[Frank van der Laan]

/**
     * Clears any saved state associated with [route] that was previously saved
     * via [popBackStack] when using a `saveState` value of `true`.
     *
     * @param route The route of the destination previously used with [popBackStack] with a
     * `saveState` value of `true`
     *
     * @return true if the saved state of the stack associated with [route] was cleared.
     */
    @MainThread
    public fun clearBackStack(
        route: String
    ): Boolean = clearBackStack(createRoute(route).hashCode())

[Frank van der Laan]

^ even this method does nothing because the route is no longer in the backstack

[Ian Lake]

clearBackStack() clears the back stack you've saved with saveState; it absolutely does work with those saved back stacks

[Ian Lake]

It sounds like you aren't passing in the right route? You'd want to pass in the route pattern of each tab in your bottom nav

[Frank van der Laan]

aah, you are actually right. I was using the id of the screen, not the id of the graph in the tab. Thank you!