如何在颤动中更改SearchDelegate StatusBarIcons颜色或buildSuggestions主体颜色？

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class CustomSearchDelegate extends SearchDelegate {
  @override
  Widget buildSuggestions(BuildContext context) {
    // 更改buildSuggestions主体颜色
    return Container(
      color: Colors.blue, // 设置主体颜色为蓝色
      child: Text('Suggestions'),
    );
  }

  @override
  ThemeData appBarTheme(BuildContext context) {
    // 更改StatusBarIcons颜色
    final ThemeData theme = Theme.of(context);
    return theme.copyWith(
      appBarTheme: theme.appBarTheme.copyWith(
        brightness: Brightness.dark, // 设置StatusBarIcons为白色
      ),
    );
  }
}

void main() {
  SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
    statusBarIconBrightness: Brightness.light, // 设置StatusBarIcons为白色
    statusBarColor: Colors.transparent, // 设置StatusBar背景颜色为透明
  ));
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Search'),
          actions: [
            IconButton(
              icon: Icon(Icons.search),
              onPressed: () {
                showSearch(context: context, delegate: CustomSearchDelegate());
              },
            ),
          ],
        ),
      ),
    );
  }
}