FutureBuilder在GestureDetector的OnTap()中不起作用

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

class _MyWidgetState extends State<MyWidget> {
  Future<String> fetchData() async {
    // 异步操作，例如从网络获取数据
    await Future.delayed(Duration(seconds: 2));
    return 'Data loaded';
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        fetchData().then((data) {
          setState(() {
            // 更新父级小部件的状态
            // 这将触发UI的重新构建
          });
        });
      },
      child: Container(
        // 父级小部件
        child: FutureBuilder(
          future: fetchData(),
          builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
            if (snapshot.connectionState == ConnectionState.waiting) {
              return CircularProgressIndicator();
            } else if (snapshot.hasError) {
              return Text('Error: ${snapshot.error}');
            } else {
              return Text('Data: ${snapshot.data}');
            }
          },
        ),
      ),
    );
  }
}