如何在 Flutter 中使屏幕可滚动？
在我的 Flutter 项目中，在一页中我有一些行，包括垂直对齐的卡片。现在，我希望这个屏幕可以滚动。
我曾尝试将该列替换为Listview，但没有奏效。我也尝试用SingleChildScrollview包装它，但没有用。它显示如下图-
这是代码 -
HomeFragment.dart
class HomeFragment extends StatefulWidget {
@override
_HomeFragmentState createState() => new _HomeFragmentState();
}
String jwt;
class _HomeFragmentState extends State<HomeFragment> {
List<LastEngagement> _lastEngagements = List<LastEngagement>();
@override
void initState() {
super.initState();
_getLastEngagement;
_getLastEngagement2();
}
void _getLastEngagement() {
Webservice().load(LastEngagement.allLastEngagement).then((newsArticles) => {
setState(() => {
_lastEngagements = newsArticles
})
});
}
void _getLastEngagement2() {
Webservice().load(LastEngagement.allLastEngagement).then((newsArticles) => {
setState(() => {
_lastEngagements = newsArticles
})
});
}
Card showCard(int index) {
return new Card(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: <Widget>[
CircleAvatar(
backgroundImage: NetworkImage(
"https://randomuser.me/api/portraits/men/1.jpg"
),
),
SizedBox(
width: 10.0,
),
Expanded(child: Text(_lastEngagements[index].title)),
],
),
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('News'),
),
body:Column(
children: <Widget>[
Row(
children: <Widget>[
Expanded(
child: Container(
color: Colors.blue,
child: SizedBox(
height: 100.0,
child: new ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: _lastEngagements.length,
itemBuilder: (BuildContext ctxt, int index) {
return Container(
width: 200.0,
child: showCard(index),
);
},
),
),
),
),
],
mainAxisAlignment: MainAxisAlignment.spaceBetween,
),
Row(
children: <Widget>[
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
child: InkWell(
splashColor: Colors.blue.withAlpha(30),
onTap: () {
print('Card tapped.');
},
child: Container(
height: 100,
child: Text('A card that can be tapped'),
),
),
),
),
),
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
child: InkWell(
splashColor: Colors.blue.withAlpha(30),
onTap: () {
print('Card tapped.');
},
child: Container(
height: 100,
child: Text('A card that can be tapped'),
),
),
),
),
),
],
),
Row(
children: <Widget>[
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
child: InkWell(
splashColor: Colors.blue.withAlpha(30),
onTap: () {
print('Card tapped.');
},
child: Container(
height: 100,
child: Text('A card that can be tapped'),
),
),
),
),
),
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
child: InkWell(
splashColor: Colors.blue.withAlpha(30),
onTap: () {
print('Card tapped.');
},
child: Container(
height: 100,
child: Text('A card that can be tapped'),
),
),
),
),
),
],
),
Row(
children: <Widget>[
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
child: InkWell(
splashColor: Colors.blue.withAlpha(30),
onTap: () {
print('Card tapped.');
},
child: Container(
height: 100,
child: Text('A card that can be tapped'),
),
),
),
),
),
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
child: InkWell(
splashColor: Colors.blue.withAlpha(30),
onTap: () {
print('Card tapped.');
},
child: Container(
height: 100,
child: Text('A card that can be tapped'),
),
),
),
),
),
],
),
Row(
children: <Widget>[
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
child: InkWell(
splashColor: Colors.blue.withAlpha(30),
onTap: () {
print('Card tapped.');
},
child: Container(
height: 100,
child: Text('A card that can be tapped'),
),
),
),
),
),
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
child: InkWell(
splashColor: Colors.blue.withAlpha(30),
onTap: () {
print('Card tapped.');
},
child: Container(
height: 100,
child: Text('A card that can be tapped'),
),
),
),
),
),
],
)
],
)
);
}
}
用 Listview 替换列会导致以下错误-
所以，我需要一个永久的解决方案来让我的屏幕可以滚动，不管我使用什么小部件。
Jar*_*vis 12
您可以使用SingleChildScrollView或更改列小部件ListView
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('News'),
),
body: SingleChildScrollView(
child: Column(
children: <Widget>[
],
),
));
}
或者
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('News'),
),
body: ListView(
children: <Widget>[],
));
}
小智 10
好吧，以前的答案确实包含解决方案..至少我是这么想的..但它们是错误的答案，这就是为什么它不起作用..试试这个
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("News"),
),
body: Column(
children: <Widget>[
Expanded(
child: SingleChildScrollView(),
)
],
),
);
}
展开后的 SingleChildScrollView() 可以占据屏幕的整个高度，使其可以工作:) 我认为它应该可以工作。祝你好运
| 归档时间： |
|
| 查看次数： |
12607 次 |
| 最近记录： |