added IPageAware to Respond to the page lifecycle in the viewmodel

samples/mavvmApp/ViewModels/SecondPageViewModel.cs

@@ -3,11 +3,12 @@
 using Microsoft.Maui.Controls;
 using Microsoft.Maui.Hosting;
 using mavvm;
+using mavvm.Interfaces;
 
 namespace mavvmApp.ViewModels
 {
     [QueryProperty(nameof(Count), "countParam")]
-    public class SecondPageViewModel : BindableBase
+    public class SecondPageViewModel : BindableBase, IPageAware
     {
         string _title;
         public string Title
@@ -54,6 +55,16 @@ async void LogCount()
             var optionAlert = await BaseMethods.ShowAlert("Count", $"Count is {Count}", "Cancel", "Ok");
             _consoleService.Log(optionAlert.ToString());
         }
+
+        public void Appearing()
+        {
+            _consoleService.Log("Appearing");
+        }
+
+        public void Disappearing()
+        {
+            _consoleService.Log("Disappearing");
+        }
     }
 }
 

src/mavvm/Factories/MavvmResolveRouteFactory.cs

@@ -1,4 +1,5 @@
 using System;
+using mavvm.Interfaces;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Maui.Controls;
 
@@ -13,11 +14,14 @@ public override Element GetOrCreate()
                 BindingContext = MavvmContainer.ServiceProvider.GetRequiredService<TViewModel>()
             };
 
-            //if (view.BindingContext is IPageAware pageAware)
-            //{
-            //    view.Disappearing += (s, e) => pageAware.Disappearing();
-            //    view.Appearing += (s, e) => pageAware.Appearing();
-            //}
+            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;
         } 

src/mavvm/Interfaces/IPageAware.cs

@@ -0,0 +1,10 @@
+using System;
+namespace mavvm.Interfaces
+{
+	public interface IPageAware
+	{
+		void Appearing();
+		void Disappearing();
+	}
+}
+

src/mavvm/mavvm.csproj

@@ -12,7 +12,7 @@
 		<SupportedOSPlatformVersion Condition="'$(TargetFramework)' == 'net6.0-android'">21.0</SupportedOSPlatformVersion>
 		<SupportedOSPlatformVersion Condition="$(TargetFramework.Contains('-windows'))">10.0.18362.0</SupportedOSPlatformVersion>
 		<PackageId>mavvm</PackageId>
-		<PackageVersion>0.9.4</PackageVersion>
+		<PackageVersion>0.9.5</PackageVersion>
 		<Authors>Vincent Niehues</Authors>
 		<Copyright>Vincent Niehues 2021</Copyright>
 		<Owners>Vincent Niehues</Owners>
@@ -28,10 +28,12 @@ It uses the Shell we all know from xamarin together with the all new .net maui w
 	  <None Remove="ViewModels\" />
 	  <None Remove="Containers\" />
 	  <None Remove="Navigation\" />
+	  <None Remove="Interfaces\" />
 	</ItemGroup>
 	<ItemGroup>
 	  <Folder Include="Implementations\" />
 	  <Folder Include="Containers\" />
 	  <Folder Include="Navigation\" />
+	  <Folder Include="Interfaces\" />
 	</ItemGroup>
 </Project>