gistfile1.txt

//
//  CustomNavigationStack.swift
//

import SwiftUI

struct CustomNavigationStack<Content: View>: View {
  @Binding var path: NavigationPath
  @ViewBuilder var content: Content

  @State private var interactivePopGestureRecognizer: UIScreenEdgePanGestureRecognizer = {
    let gesture = UIScreenEdgePanGestureRecognizer()
    gesture.name = UUID().uuidString
    gesture.edges = UIRectEdge.left
    gesture.isEnabled = true
    return gesture
  }()

  var body: some View {
    NavigationStack(path: $path) {
      content
        .background {
          AttachPopGestureView(gesture: $interactivePopGestureRecognizer)
        }
    }
  }
}

private struct AttachPopGestureView: UIViewRepresentable {
  @Binding var gesture: UIScreenEdgePanGestureRecognizer

  func makeUIView(context: Context) -> some UIView {
    UIView()
  }

  func updateUIView(_ uiView: UIViewType, context: Context) {
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.02) {
      if let parentVC = uiView.parentViewController {
        if let navigationController = parentVC.navigationController {
          // To prevent duplication
          guard !(navigationController.view.gestureRecognizers?
            .contains(where: { $0.name == gesture.name }) ?? true) else { return }
          navigationController.addInteractivePopGesture(gesture)
        }
      }
    }
  }
}

// MARK: - Helper
private extension UINavigationController {
  func addInteractivePopGesture(_ gesture: UIPanGestureRecognizer) {
    guard let gestureSelector = interactivePopGestureRecognizer?.value(forKey: "targets") else { return }

    gesture.setValue(gestureSelector, forKey: "targets")
    view.addGestureRecognizer(gesture)
  }
}

private extension UIView {
  var parentViewController: UIViewController? {
    sequence(first: self) { $0.next }.first(where: { $0 is UIViewController }) as? UIViewController
  }
}