如何防止Flutter小部件在键盘出现时调整大小？

Question

出现键盘时，Flutter窗口小部件将调整大小。如何在不使用

的情况下防止这种情况

resizeToAvoidBottomInset : false,

如果我将其设置为假，则因为键盘在其上方，所以我看不到TextFormField怎么办？这是我的代码

    return Scaffold(
//      resizeToAvoidBottomInset : false,
      body: Center(
        child: Stack(
          children: <Widget>[
            SizedBox(
              height: MediaQuery.of(context).size.height,
              width: MediaQuery.of(context).size.width,
              child: Image.asset('images/back_ui4.png',fit: BoxFit.fill,),
            ),
            SingleChildScrollView(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  SizedBox(height: 0.7*MediaQuery.of(context).size.height,),
                  TextFormField()
                ],
              ),
            ),
          ],
        ),
      ),
    );

Answer 1

return Scaffold(
      body: SingleChildScrollView(
        child : Center(
        child: Stack(
          children: <Widget>[
            SizedBox(
              height: MediaQuery.of(context).size.height,
              width: MediaQuery.of(context).size.width,
              child: Image.asset('images/back_ui4.png',fit: BoxFit.fill,),
            ),
            Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  SizedBox(height: 0.7*MediaQuery.of(context).size.height,),
                  TextFormField()
                ],
              ),
            ),
          ],
        ),
      ),
    );