fixes for pre12

src/mavvm/Factories/MavvmResolveRouteFactory.cs

@@ -7,6 +7,28 @@ namespace mavvm
 {
     public class MavvmResolveRouteFactory<TView, TViewModel> : RouteFactory where TView : ContentPage, new() where TViewModel : BindableBase
     {
+
+        public override Element GetOrCreate(IServiceProvider services)
+        {
+            var serviceProvider = services != null ? services : MavvmContainer.ServiceProvider;
+
+            var view = new TView
+            {
+                BindingContext = serviceProvider.GetRequiredService<TViewModel>()
+            };
+
+            if (view.BindingContext is IPageAware pageAware)
+            {
+                view.Disappearing -= (s, e) => pageAware.Disappearing();
+                view.Appearing -= (s, e) => pageAware.Appearing();
+
+                view.Disappearing += (s, e) => pageAware.Disappearing();
+                view.Appearing += (s, e) => pageAware.Appearing();
+            }
+
+            return view;
+        }
+
         public override Element GetOrCreate()
         {
             var view = new TView
@@ -24,7 +46,7 @@ public override Element GetOrCreate()
             }
 
             return view;
-        } 
+        }
     }
 }