boolean-publisher-example-2-cancellable

class AgreementFormVC: UIViewController {
    
    @Published var isNextEnabled: Bool = false
    // private var switchSubscriber: AnyCancellable?
    private var subscribers = Set<AnyCancellable>() // ← set of all subscriptions 
    @IBOutlet private weak var acceptAgreementSwitch: UISwitch!
    @IBOutlet private weak var nextButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Save the Cancellable Subscription
        $isNextEnabled
            .receive(on: DispatchQueue.main)
            .assign(to: \.isEnabled, on: nextButton)
            .store(in: &subscribers) // ← storing the subscription
    }
    
    @IBAction func didSwitch(_ sender: UISwitch) {
        isNextEnabled = sender.isOn
    }
    
}