如何将API调用中的值赋给flutter中的变量

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

class MyApiPage extends StatefulWidget {
  @override
  _MyApiPageState createState() => _MyApiPageState();
}

class _MyApiPageState extends State<MyApiPage> {
  String apiData = '';

  Future<void> fetchData() async {
    try {
      Response response = await Dio().get('https://api.example.com/data');
      setState(() {
        apiData = response.data['value'];
      });
    } catch (error) {
      print(error);
    }
  }

  @override
  void initState() {
    super.initState();
    fetchData();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('API Data'),
      ),
      body: Center(
        child: Text(apiData),
      ),
    );
  }
}