SliverAppBar隐藏SliverFillRemaining中的小部件

Question

SliverFillRemainingWhen中有一些小部件滚动页面，这些小部件隐藏在SliverAppBar下方。

我想查看AppBar下面的小部件。

return new Scaffold(
  body: new Stack(
    children: <Widget>[
      new CustomScrollView(
        controller: _scrollController,
        slivers: [
          new SliverAppBar(
            expandedHeight: 256.0,
            pinned: true,
            snap: true,
            floating: true,
            forceElevated: true,
            flexibleSpace: new FlexibleSpaceBar(
              title: new Text("Status Entry"),
              centerTitle: true,
              background: new Image.asset(
                "assets/images/noimage.png",
                fit: BoxFit.cover,
              ),
            ),
          ),

    SliverFillRemaining(
            child: Center(
              child: new SingleChildScrollView(
                  padding: const EdgeInsets.only(
                      left: 20.0, right: 20.0, top: 0.0, bottom: 0.0),
                  child: new Column(
                    //mainAxisAlignment: MainAxisAlignment.start,
                    mainAxisSize: MainAxisSize.max,
                    children: <Widget>[
                      TextField(
                        enabled: false, // will disable paste operation
                        decoration: InputDecoration(labelText: 'Work name'),
                      ),
                      TextFormField(
                        decoration: InputDecoration(
                            labelText: 'Enter your current status'),
                      ),

                    ],
                  )),
            ),
          ),

我的输出是这样的：