如何在ModalBottomSheet pop后更新原始页面的状态？

var data = '初始数据';

void updateData(String newData) {
  setState(() {
    data = newData;
  });
}

void _showModalBottomSheet() {
  showModalBottomSheet(
    context: context,
    builder: (BuildContext context) {
      return Container(
        child: Column(
          children: [
            Text('ModalBottomSheet内容'),
            RaisedButton(
              child: Text('更新数据'),
              onPressed: () {
                Navigator.pop(context, '更新后的数据');
              },
            ),
          ],
        ),
      );
    },
  ).then((value) {
    updateData(value);
  });
}