SwiftUI Navigation stack

Navigation.swift

struct NavigationStack: View {

    @ObservedObject var viewModel: NavigationStackViewModel

    var body: some View {
        viewModel.currentBody?
            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .center)
    }
}

final class NavigationStackViewModel: Navigation, ObservableObject {

    @Published private var stack = [AnyView]()
    @Published var currentBody: AnyView?

    init(root: AnyView? = nil) {
        currentBody = root
    }

    func present<T: View>(view newView: T) {
        if let currentBody = currentBody {
            stack.append(currentBody)
        }
        currentBody = AnyView(newView)
    }

    func dismiss() {
        currentBody = stack.removeLast()
    }
}

protocol Navigation {
    var currentBody: AnyView? { get }

    func present<T: View>(view: T)
    func dismiss()
}