清理引用，将NavigatorServices更改为使用Message来实现导航的切换

Extensions/TaskExtensions.cs

@@ -2,8 +2,7 @@
 
 public static class TaskExtensions
 {
-
-    public  static async Task Await(this Task task,Action<Exception> onError=null,Action onComplete=null)
+    public static async Task Await(this Task task, Action<Exception> onError = null, Action onComplete = null)
     {
         try
         {
@@ -15,5 +14,4 @@ public static class TaskExtensions
             onError?.Invoke(e);
         }
     }
-    
 }