我想在页面中添加SingleChildScrollView,但我具有PageView。
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new IneatAppBarPollWidget()
.getAppBar('Blackblox', 'assets/img/logo_ineat.png', cand),
body: new Center(
child: SingleChildScrollView(
child: new Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new Expanded(
child: new Container(
child: new FutureBuilder<List<PollQuestionsDto>>(
future: _future,
// ignore: missing_return
builder: (context, snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
return Text('Failed connection API');
case ConnectionState.waiting:
return new Text('Wait...');
case ConnectionState.done:
if (snapshot.hasData) {
if (snapshot.data != null) {
return PageView.builder(
scrollDirection: Axis.horizontal,
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context, index) {
print(this.responses);
return PollListViewItem(
entitled:
snapshot.data[index].entitled,
answers:
snapshot.data[index].answers,
currentAnswer:
this.responses[index],
onSelect: (Answer answer) {
this.responses[index] = answer;
},
);
},
);
}
}
break;
case ConnectionState.active:
}
}),
),
),
new ProgressBar(),
new Container(
margin: EdgeInsets.only(right: 10.0),
child: new RaisedButton.icon(
onPressed: () async {
//await Poll().submitPoll(answers: answers);
setState(() {
Navigator.pushReplacement(context,
MaterialPageRoute(builder: (context) =>
PollPage()));
});
},
label: Text('Suivant'),
icon: Icon(Icons.navigate_next),
),
alignment: Alignment.bottomRight,
),
],
),
),
),
);
}
}
添加时,出现此错误:
RenderFlex子级具有非零的flex,但是传入的高度限制是不受限制的。
[当列位于不提供有限高度限制的父级中时,例如,如果它在垂直滚动条中,它将尝试沿垂直轴收缩包装其子级。在子级上设置柔韧性(例如使用扩展)表示子级将扩展以填充垂直方向上的剩余空间。这两个指令是互斥的。如果父母要收缩包裹其子女,则子女不能同时扩张以适合其父母。考虑将mainAxisSize设置为MainAxisSize.min并使用FlexFit.loose适合于灵活的子代(使用Flexible而不是Expanded)。这将使灵活的子代能够将其大小调整为小于他们将被迫占用的无限剩余空间,然后使RenderFlex收缩包装子代,而不是扩展以适应父代提供的最大约束。] >
RenderBox未被布置:RenderFlex#4c442 relayoutBoundary = up12 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE'package:flutter / src / rendering / box.dart':断言失败:行1681位置12:'hasSize'
我想在页面中添加SingleChildScrollView,但我具有PageView。 @override Widget build(BuildContext context){return new Scaffold(appBar:new IneatAppBarPollWidget()....
我用示例数据重新创建了您的案例。以下是我修复的问题: