storing information of the onboarding in the NavigationController

NavigationOnboardingController.swift

import Foundation
import Combine

class NavigationController: ObservableObject  {
    
    @Published var hasSeenOnboarding: Bool
    var subscriptions = Set<AnyCancellable>()
    
    init() {
        //initilizing by looking up the value from UserDefaults
        hasSeenOnboarding = UserDefaults.standard.bool(forKey: onboardingKey)
        
        //updating the value in UserDefaults every time the onboarding value changes
        $hasSeenOnboarding.removeDuplicates().sink { (value) in
            UserDefaults.standard.set(value, forKey: self.onboardingKey)
        }.store(in: &subscriptions)
    }
    
    
    private let onboardingKey = "hasSeenOnboarding"
}