Flutter带搜索图标的文本输入框

import 'dart:convert';

import 'package:flutter/material.dart';

void main() {
   
   
  runApp(const MaterialApp(home: _SecondScreen()));
}

class _SecondScreen extends StatelessWidget {
   
   
  const _SecondScreen({
   
   super.key});

  @override
  Widget build(BuildContext context) {
   
   
    return Scaffold(
      appBar: AppBar(title: const Text('每日进阶')),