Flutter 侧滑菜单
Scaffold中有drawer和endDrawer两个参数
分别对应左边的菜单和右边的菜单

左Drawer
侧滑菜单能够从左面滑出
drawer: new Drawer( child: new ListView( children: <Widget>[  ], ), ),

右endDrawer从右面滑出
endDrawer: new Drawer( child: new ListView( children: <Widget>[ ], ), ),

@override
Widget build(BuildContext context) {
super.build(context);
return Scaffold(
  appBar: AppBar(
    title: Text('侧滑菜单'),
  ),
  body: Center(
    child: Text('侧滑菜单'),
  ),
  drawer: new Drawer(
    child: new ListView(
      children: <Widget>[],
    ),
  ),
  endDrawer: new Drawer(
    child: new ListView(
      children: <Widget>[],
    ),
  ),
  )
}