AuthGraph

AuthGraph.kt

fun NavGraphBuilder.authGraph(navController: NavController) {
    navigation(
        startDestination = AuthScreens.Login.route,
        route = Graph.AUTHENTICATION
    ) {
        composable(AuthScreens.Login.route) {
            LoginScreen(navController = navController)
        }

        composable(AuthScreens.SignUp.route) {
            SignUpScreen(navController = navController)
        }
    }
}

sealed class AuthScreens(val route: String) {
    object SignUp : AuthScreens(route = "sign_up")
    object Login : AuthScreens(route = "login")
}

@Composable
fun LoginScreen(navController: NavController) {
    Box(
        modifier = Modifier.fillMaxSize(),
        contentAlignment = Alignment.Center
    ) {
        Button(onClick = {
            navController.navigate(AuthScreens.SignUp.route)
        }) {
            Text(text = "Sign Up")
        }
    }
}

@Composable
fun SignUpScreen(navController: NavController) {
    Box(
        modifier = Modifier.fillMaxSize(),
        contentAlignment = Alignment.Center
    ) {
        Button(onClick = {
            navController.popBackStack()
        }) {
            Text(text = "Back")
        }
    }
}