initState()方法中异步函数调用总是在Flutter中的build()方法之后调用吗？

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  String data;

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

  Future<void> fetchData() async {
    // 模拟异步操作
    await Future.delayed(Duration(seconds: 1));
    setState(() {
      data = 'Data fetched successfully';
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: data != null
            ? Text(data)
            : CircularProgressIndicator(),
      ),
    );
  }
}