如何首先应用从Firebase收到的数据？

Question

给定以下代码：

  Widget Topstocklist(Size size) {

    firestore
        .collection('stock')
        .orderBy("dailynewscount", descending: true)
        .limit(1)
        .get()
        .then((QuerySnapshot qs)
    {
      qs.docs.forEach((doc){
        name = (doc['name']);
        perc = (doc['perc']);
        price = (doc['price']);
        newscount = (doc['dailynewscount']);
        print("100");
      });
    }
    );

    return Container(
        child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
      Text(
        '',
        style: TextStyle(
          color: Color.fromRGBO(0, 0, 0, 0.7),
          fontFamily: 'Content',
          fontSize: size.width * 0.025,
          fontWeight: FontWeight.normal,
          height: 1,
        ),
      ) // Firebase 적용 사항
      ,
      Container(
          child: Column(
            children: [
              Topstock(size, "deci", "+3.2%", 75000, 1200),
              Topstock(size, name, perc, price ,newscount),
            ],
          ))
    ]));
  }

 Widget Topstock(Size size, String stockname, var stockperc, var stockprice, var newscount) {
    print(stockperc);
}

关键点代码： 打印（“ 100”） 打印（stockperc）。

预期

I/flutter (15287): 100
I/flutter (15287): //perc = (doc['perc']);
I/flutter (15287): +3.2%

输出

 I/flutter (15287): +3.2%
 I/flutter (15287): 
 I/flutter (15287): 100

我认为，在从firebase导入数据之前，我认为这个问题与任务处理有关，即，异步工作，但是我还没有找到解决

方案来自Firebase的数据，然后运行TopStock代码？