opt: nav icon color

ref orz12/main

lib/pages/main/view.dart

@@ -184,6 +184,14 @@ class _MainAppState extends State<MainApp>
           }
         }
       },
+      child: AnnotatedRegion<SystemUiOverlayStyle>(
+        value: SystemUiOverlayStyle(
+          systemNavigationBarColor: Colors.transparent,
+          systemNavigationBarIconBrightness:
+              Theme.of(context).brightness == Brightness.light
+                  ? Brightness.dark
+                  : Brightness.light, // 设置虚拟按键图标颜色
+        ),
         child: Scaffold(
           resizeToAvoidBottomInset: false,
           extendBody: true,
@@ -250,8 +258,8 @@ class _MainAppState extends State<MainApp>
               ),
             ],
           ),
-        bottomNavigationBar:
+          bottomNavigationBar: useSideBar ||
-            useSideBar || context.orientation == Orientation.landscape
+                  context.orientation == Orientation.landscape
               ? null
               : StreamBuilder(
                   stream: _mainController.hideTabBar
@@ -325,6 +333,7 @@ class _MainAppState extends State<MainApp>
                   },
                 ),
         ),
+      ),
     );
   }