【发布时间】：2019-12-01 03:19:26
【问题描述】：
在我的 Flutter 项目中，在一页中我有一些行，包括卡片垂直对齐。现在，我希望这个屏幕可以滚动。
我已尝试将列替换为 Listview，但没有成功。我也尝试用 SingleChildScrollview 包装它，但没有奏效。如下图所示-
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 Column 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。
【问题讨论】：
-
当您将内容包装到 List 或 SingleChildScrollview 中时，只需删除 Expanded 并尝试。
-
我应该删除所有展开的吗？
-
是的，您需要删除所有展开的。
-
通过将内容包装到 List 或 SingleChildScrollview 我只是删除了 Expanded。但它没有用