如何使用streambuilder以QuerySnaphot格式从firestore中获取数据？

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

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<QuerySnapshot>(
      stream: FirebaseFirestore.instance.collection('myCollection').snapshots(),
      builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
        if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        }

        if (snapshot.connectionState == ConnectionState.waiting) {
          return Text('Loading...');
        }

        if (snapshot.hasData) {
          // 处理数据
          final data = snapshot.data!.docs;
          return ListView.builder(
            itemCount: data.length,
            itemBuilder: (BuildContext context, int index) {
              final document = data[index];
              return ListTile(
                title: Text(document['title']),
                subtitle: Text(document['subtitle']),
              );
            },
          );
        }

        return Text('No data available');
      },
    );
  }
}