使用 BottomNavigationBar：BottomAppBar 时，正文不会显示在屏幕上。但是当我移动它时，身体会出现在屏幕上。由于我应该在主体之外有底部导航栏，所以为什么当底部导航栏在代码中时正文内容不可见，这是非常令人费解的。
编辑：想知道是否可能需要将主体从“新容器”更改为其他内容，因此我包含了这么多代码。
这是代码：
Widget build(BuildContext context) {
return new Scaffold(
appBar: AppBar(
title: const Text('Refine'),
backgroundColor: Color(0xFFffffff),
),
body: new Container(
width: MediaQuery.of(context).copyWith().size.width,
child: ListView(
shrinkWrap: true,
children: <Widget>[
new Column(
children: <Widget>[
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
child: Text(
'Sort By',
style:
TextStyle(color: Colors.black, fontSize: 15.0, fontWeight: FontWeight.bold),
),
),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
color: Color(0xFFffffff),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
new Text(
'Relevance',
style:
TextStyle(color: Colors.black,
fontSize: 15.0,
fontWeight: FontWeight.normal),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
new Text(
'Top Rated',
style:
TextStyle(color: Colors.black,
fontSize: 15.0,
fontWeight: FontWeight.normal),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
new Text(
'New',
style:
TextStyle(color: Colors.black,
fontSize: 15.0,
fontWeight: FontWeight.normal),
),
],
),
),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
child: Text(
'Category',
style:
TextStyle(color: Colors.black, fontSize: 15.0, fontWeight: FontWeight.bold),
),
),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
color: Color(0xFFffffff),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
new DropdownButtonHideUnderline(
child: DropdownButton<String>(
hint: Text('All Categories'),
),
),
],
),
),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
child: Text(
'Location',
style:
TextStyle(color: Colors.black,
fontSize: 15.0,
fontWeight: FontWeight.bold),
),
),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
color: Color(0xFFffffff),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget> [
new DropdownButtonHideUnderline(
child: DropdownButton<String>(
hint: Text('Illinois'),
),
),
new DropdownButtonHideUnderline(
child: DropdownButton<String>(
hint: Text('Chicago'),
),
),
],
),
),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
child: Text(
'Price',
style:
TextStyle(color: Colors.black,
fontSize: 15.0,
fontWeight: FontWeight.bold),
),
),
),
new Padding(
padding: const EdgeInsets.only(top: 15.0,),
),
Align(
alignment: Alignment.centerLeft,
child: Container(
color: Color(0xFFffffff),
child: Row(
children: <Widget>[
new Text(
'\$',
),
new Text(
'To',
),
],
),
),
),
],
),
],
),
),
bottomNavigationBar: BottomAppBar(
child: new Container(
padding: EdgeInsets.only(
top: 20.0,
bottom: 20.0,
left: 25.0,
right: 25.0,
),
decoration: BoxDecoration(
color: Color(0xFFffffff),
),
child: new Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new SizedBox(
width: double.infinity, child: RaisedButton(
color: Color(0xFF2e616f),
textColor: Colors.white,
onPressed: () {},
child: Text('Apply',
style: new TextStyle(fontSize: 14.0)),
),
),
],
),
),
),
);
}