Swipe to go back in specific SwiftUI views

Question

In my SwiftUI app I have set in all my views .navigationBarBackButtonHidden(true) to have always a custom Back Button, so the iOS classic swipe to go back has been disabled everywhere, but I actually need it only in specific views.

I re enabled it using this code:

extension UINavigationController: UIGestureRecognizerDelegate {
    override open func viewDidLoad() {
        super.viewDidLoad()
        interactivePopGestureRecognizer?.delegate = self
    }

    public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        return viewControllers.count > 1
    }
}

It works but unfortunately it re enables swipe to go back in the entire project, what should I do?

Answer 1

It can be managed via some global app state, like

class AppState {
  static let shared = AppState()

  var swipeEnabled = false    // << by default
}

extension UINavigationController: UIGestureRecognizerDelegate {
    // ...

    public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        return AppState.shared.swipeEnabled ? 
                 viewControllers.count > 1 : false // << here !!
    }
}

// ... and somewhere in view, for example
     .onAppear {
        AppState.shared.swipeEnabled = true
     }
     .onDisappear {
        AppState.shared.swipeEnabled = false
     }