无法访问 streambuilder 中的文档

Question

大家好，我试图构建一个 streambuilder 来访问我的云存储，但我无法做到 streamsnapshot.data.doc，因为我无法将文档用于我的应用程序

这是我的 streambuilder 代码：

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

class ChatScreen extends StatelessWidget {
  const ChatScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: StreamBuilder(
        stream: FirebaseFirestore
            .instance 
            .collection('chats')
            .snapshots(), 
        builder: (ctx, streamSnapshot) {
          if (streamSnapshot.connectionState == ConnectionState.waiting) {
            return Center(
              child: CircularProgressIndicator(),
            );
          }

          return ListView.builder(
              itemCount: streamSnapshot.data,   **//not able to add .documents.length after this**
              itemBuilder: (ctx, index) => Container(
                    padding: EdgeInsets.all(8.0),
                    child: Text('This is working'),
                  ));
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {},
        child: Icon(Icons.add),
      ),
    );
  }
}

Answer 1

您必须像这样在 StreamBuilder 上添加对象的类型：

StreamBuilder<YourObject>

之后，您将从 streamSnapshot

访问 documents