ui adjustment

Pixiview.iOS/Services/EnvironmentService.cs

@@ -1,5 +1,8 @@
-using Pixiview.iOS.Services;
+using System.Diagnostics.CodeAnalysis;
+using Pixiview.iOS.Services;
 using Pixiview.Utils;
+using UIKit;
+using Xamarin.Essentials;
 using Xamarin.Forms;
 
 [assembly: Dependency(typeof(EnvironmentService))]
@@ -7,6 +10,32 @@ namespace Pixiview.iOS.Services
 {
     public class EnvironmentService : IEnvironmentService
     {
+        [SuppressMessage("Code Notifications", "XI0002:Notifies you from using newer Apple APIs when targeting an older OS version", Justification = "<Pending>")]
+        public Theme GetApplicationTheme()
+        {
+            if (UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
+            {
+                var currentController = Platform.GetCurrentUIViewController();
+                if (currentController == null)
+                {
+                    return Theme.Light;
+                }
+                var style = currentController.TraitCollection.UserInterfaceStyle;
+                if (style == UIUserInterfaceStyle.Dark)
+                {
+                    return Theme.Dark;
+                }
+                else
+                {
+                    return Theme.Light;
+                }
+            }
+            else
+            {
+                return Theme.Light;
+            }
+        }
+
         public EnvironmentParameter GetEnvironment()
         {
             return new EnvironmentParameter
@@ -18,5 +47,10 @@ namespace Pixiview.iOS.Services
                 IconLeft = "\uf104"     // for android, it's "\uf060"
             };
         }
+
+        public void SetStatusBarColor(Color color)
+        {
+            // nothing need to do
+        }
     }
 }