Flutter TextFormField 被键盘隐藏

NOTE: Im using Navigator.of(context).push to push ModalRoute,个

嗨，我有ModalRoute页和TextFormField页的正文，但是当键盘出现时，输入被键盘隐藏了，怎么解决这个问题？

个

return Container(
      child: ListView(
          children: <Widget>[
            //other widget
            SizedBox(height: _qtyAnimation.value),
            Row(
              children: <Widget>[
                Expanded(
                  child: Text(
                    "Jumlah",
                    style: TextStyle(fontWeight: FontWeight.bold),
                  ),
                ),
                SizedBox(
                  width: 145.0,
                  child: TextFormField(
                    focusNode: _qtyFocusNode,
                    controller: qty,
                    keyboardType: TextInputType.number,
                    textAlign: TextAlign.center,
                    decoration: InputDecoration(
                      contentPadding: EdgeInsets.all(0.0),
                      prefixIcon: IconButton(
                        icon: Icon(Icons.remove),
                        onPressed: () {},
                      ),
                      border: OutlineInputBorder(
                        borderSide:
                            BorderSide(color: Colors.grey, width: 0.1),
                      ),
                      suffixIcon: IconButton(
                        icon: Icon(Icons.add),
                        onPressed: () {},
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ],
    );

这就是我的代码，我try 使用焦点 node 以及更多，结果仍然是一样的 请帮帮我