我注意到Scaffold的抽屉.只有当有AppBar of Scaffold时，才会出现抽屉.
但我没有使用AppBar，而是使用了BottomNavigationBar中的BottomAppBar.
如何让Drawer使用BottomAppBar？
class homieclass extends State<homie>{
@Override 小部件生成(BuildContext上下文){ 退货MaterialApp( debugShowCheckedModeBanner:False， 主页:新脚手架(
backgroundColor: Colors.white70.withOpacity(0.9),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
floatingActionButton: FloatingActionButton(onPressed: (){},backgroundColor: Colors.redAccent,child: ImageIcon(new AssetImage("ast/hello123.png")),),
bottomNavigationBar: BottomAppBar(child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,mainAxisSize: MainAxisSize.max,children: <Widget>[
IconButton(icon: Icon(Icons.menu), onPressed: (){}),IconButton(icon: Icon(Icons.message), onPressed: (){}),
],
),
),
body: new Column(
children: <Widget>[new SizedBox(height: 50.0, ),
Container(margin: EdgeInsets.only(left: 0.0),child: new Text("Events",textAlign: TextAlign.left,style: TextStyle(fontFamily: 'ssfr',fontSize: 35.0,fontWeight: FontWeight.bold),),)
, Container(margin: EdgeInsets.only(left: 10.0,right: 10.0) ,width: 360.0,height: 40.0,decoration: new BoxDecoration(color: Colors.blueGrey.withOpacity(0.2),
border: new Border.all(color: Colors.blueGrey.withOpacity(0.0), width: 2.0),
borderRadius: new BorderRadius.circular(10.0),),child: new Row(children: <Widget>[SizedBox(width: 10.0,),Icon(Icons.search,color: Colors.blueGrey.withOpacity(0.9),),Text(" Search",style: TextStyle(fontFamily: 'ssft',color: Colors.blueGrey,fontSize: 20.0),)],),)
,new SizedBox(height: 10.0,),new SizedBox(
height: 5.0,
child: new Center(
child: new Container(
margin: new EdgeInsetsDirectional.only(start: 1.0, end: 1.0),
height: 2.0
,
color: Colors.redAccent.withOpacity(0.8),
),
),
),],
),drawer: new Drawer(
child: new ListView(
children: <Widget>[ListTile(title: Text("hello"),)],
),
),
),
);
}