FlowCoordinator.swift

final class FlowCoordinator: ObservableObject {
  // …
  func showDetailView() {
    let detailView = DetailView()
      .environmentObject(self)
    let viewController = UIHostingController(rootView: detailView)
    window.rootViewController?.present(viewController, animated: true, completion: nil)
  }
    
  func closeDetailView() {
    // Needs to be more sophisticated later when there are more views
    window.rootViewController?.presentedViewController?.dismiss(animated: true, completion: nil)
  }
}

struct DetailView: View {
  @EnvironmentObject var flowController: FlowCoordinator
    
  var body: some View {
    VStack(spacing: 8) {
      Text("Detail view content")
      Button("Dismiss", action: flowController.closeDetailView)
    }.frame(maxWidth: .infinity, maxHeight: .infinity)
      .background(.orange)
  }
}