sunshinejr · February 26, 2020 10:57 · Feb 26, 2020
diff --git a/Navigation.swift b/Navigation.swift
@@ -0,0 +1,37 @@
+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()
+}