1、SearchAppBar增加searchIconSize属性

lib/widget/search_app_bar.dart

@@ -17,6 +17,7 @@ class SearchAppBar extends StatefulWidget implements PreferredSizeWidget {
   final Color? hintTextColor;
   final Color? searchTextColor;
   final Color? searchIconColor;
+  final double? searchIconSize;
   final Function? onFocusListener;
   final String? rightText;
   final Function? onRightBtnCallback;
@@ -37,6 +38,7 @@ class SearchAppBar extends StatefulWidget implements PreferredSizeWidget {
     this.rightText,
     this.onRightBtnCallback,
     this.searchIconColor,
+    this.searchIconSize,
   }) : super(key: key);
 
   @override
@@ -84,7 +86,11 @@ class _SearchAppBarState extends State<SearchAppBar> {
                 child: Row(
                   children: <Widget>[
                     hGap10,
-                    Icon(Icons.search, color: widget.searchIconColor ?? Colors.grey.shade300),
+                    Icon(
+                      Icons.search,
+                      color: widget.searchIconColor ?? Colors.grey.shade300,
+                      size: widget.searchIconSize,
+                    ),
                     hGap5,
                     Expanded(
                       child: TextField(