update for changed navigation interface

Author: christiannagel

Xamarin/BooksAppX/BooksAppX/BooksAppX/Services/XamarinNavigationService.cs

@@ -46,6 +46,8 @@ public string CurrentPage
             }
         }
 
+        public bool UseNavigation { get; set; }
+
         private readonly XamarinInitializeNavigationService _initializeNavigation;
 
         public XamarinNavigationService(XamarinInitializeNavigationService initializeNavigation) =>

Xamarin/BooksAppX/BooksAppX/BooksAppX/Views/BooksPage.xaml.cs

@@ -1,19 +1,17 @@
-using BooksLib.Models;
-using BooksLib.ViewModels;
+using BooksLib.ViewModels;
 using Microsoft.Extensions.DependencyInjection;
 using Xamarin.Forms;
 using Xamarin.Forms.Xaml;
 
 namespace BooksAppX.Views
 {
     [XamlCompilation(XamlCompilationOptions.Compile)]
-	public partial class BooksPage : ContentPage
-	{
-		public BooksPage ()
-		{
-			InitializeComponent ();
+    public partial class BooksPage : ContentPage
+    {
+        public BooksPage()
+        {
+            InitializeComponent();
             BindingContext = this;
-            ViewModel.UseNavigation = true;
         }
 
         public BooksViewModel ViewModel { get; } = (Application.Current as App).AppServices.GetService<BooksViewModel>();