1、修改SearchAppBar

lib/widget/search_app_bar.dart

@@ -14,6 +14,7 @@ class SearchAppBar extends StatefulWidget implements PreferredSizeWidget {
   final Color? searchBackgroundColor;
   final Color? inputTextColor;
   final Color? hintTextColor;
+  final Color? searchTextColor;
 
   const SearchAppBar({
     Key? key,
@@ -25,6 +26,7 @@ class SearchAppBar extends StatefulWidget implements PreferredSizeWidget {
     this.searchBackgroundColor,
     this.inputTextColor,
     this.hintTextColor,
+    this.searchTextColor,
   }) : super(key: key);
 
   @override
@@ -98,9 +100,11 @@ class _SearchAppBarState extends State<SearchAppBar> {
               child: Container(
                 width: 60.0,
                 alignment: Alignment.center,
-                child: const Text(
+                child: Text(
                   "搜索",
-                  style: TextStyle(color: Color(0xFFFFFFFF), fontSize: 14.0),
+                  style: TextStyle(
+                      color: widget.searchTextColor ?? const Color(0xFFFFFFFF),
+                      fontSize: 14.0),
                 ),
               ),
             )