如何将transaction与int data - Firestore Flutter一起使用

dependencies:
  cloud_firestore: ^2.2.0

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

void main() async {
  // 初始化Firestore
  WidgetsFlutterBinding.ensureInitialized();
  await FirebaseFirestore.instance
      .settings(host: 'your_firestore_host')
      .enablePersistence();
  
  runApp(MyApp());
}

void incrementCounter() async {
  FirebaseFirestore firestore = FirebaseFirestore.instance;
  
  firestore.runTransaction((transaction) async {
    DocumentReference counterRef = firestore.collection('counters').doc('counter1');
    
    DocumentSnapshot counterSnapshot = await transaction.get(counterRef);
    int currentCounter = counterSnapshot.data()['value'];
    int newCounter = currentCounter + 1;
    
    transaction.update(counterRef, {'value': newCounter});
  });
}

StreamBuilder<DocumentSnapshot>(
  stream: FirebaseFirestore.instance.collection('counters').doc('counter1').snapshots(),
  builder: (context, snapshot) {
    if (snapshot.hasData) {
      int counterValue = snapshot.data.data()['value'];
      return Text('Counter: $counterValue');
    } else {
      return CircularProgressIndicator();
    }
  },
)