如何使屏幕在Flutter中可滚动？ [英] How to make a screen scrollable in Flutter?
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问题描述
在我的Flutter项目中，一页中有几行，包括垂直对齐的卡片。现在，我希望该屏幕可滚动。
In my Flutter project, in one page I have some rows including card align vertically. Now, I want this screen to make scroll-able.
我尝试将列替换为 Listview ，但没有用。我也尝试用 SingleChildScrollview 包装它，但是没有用。如下图所示-
I have tried replacing the column to Listview but it didn't work. I also tried to wrap it with SingleChildScrollview but didn't work. It shows like below image-
< img src = https://i.stack.imgur.com/K0C0D.png alt =在此处输入图片描述>
这里是代码-
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'),
),
),
),
),
),
],
)
],
)
);
}
}
替换列由Listview引起以下错误-
Replacing the Column by Listview causes following error-
< img src = https://i.stack.imgur.com/Q97oX.png alt =在此处输入图片描述>
因此，我需要一个永久性的解决方案来使屏幕可滚动，而不管我使用什么小部件。
So, I need a permanent solution to make my screen scroll-able, doesn't matter whatever widgets I use.
推荐答案
您可以使用 SingleChildScrollView 或将列窗口小部件更改为 ListView
You can use SingleChildScrollView or change the column widget to ListView
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('News'),
),
body: SingleChildScrollView(
child: Column(
children: <Widget>[
],
),
));
}
或
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('News'),
),
body: ListView(
children: <Widget>[],
));
}
这篇关于如何使屏幕在Flutter中可滚动？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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