Question

An AI wrote this Swift Combine subscription to update a balance label from a shared publisher. It works, but after the user navigates away from and back to this screen several times, you notice old screens still receiving updates, and the network layer reports duplicate in-flight requests multiplying. What's wrong and how would you fix it?

1final class BalanceVC: UIViewController {2    override func viewDidLoad() {3        super.viewDidLoad()4        AppState.shared.balancePublisher5            .receive(on: DispatchQueue.main)6            .sink { value in7                self.label.text = "$\(value)"8            }9    }10}