在firestore中更新数据时，Itembuilder不能在streambuilder中执行

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

StreamBuilder<DocumentSnapshot>(
  stream: FirebaseFirestore.instance.collection('collectionName').doc('documentID').snapshots(),
  builder: (BuildContext context, AsyncSnapshot<DocumentSnapshot> snapshot) {
    if (snapshot.hasError) {
      return Text('Error: ${snapshot.error}');
    }

    if (snapshot.connectionState == ConnectionState.waiting) {
      return CircularProgressIndicator();
    }

    if (snapshot.hasData && !snapshot.data.exists) {
      return Text('Document does not exist');
    }

    // 获取更新后的数据
    var data = snapshot.data.data();

    return ItemBuilder(
      // 在这里根据更新后的数据构建UI
    );
  },
);

FirebaseFirestore.instance.collection('collectionName').doc('documentID').update({
  'fieldName': 'updatedValue',
});