在我的flutter应用程序中,我想有一张卡片和四个水平对齐的框,其中的宽度和高度相等。代码如下;
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Container(
padding: EdgeInsets.fromLTRB(20,10,10,0),
height: 220,
width: double.maxFinite,
child: Card(
elevation: 5,
child: Column(
children: <Widget>[
Row(
children: <Widget>[
Expanded(
child: Container(
height:25,
color:Color(0xff6898F7),
child: Text('Online Pharmacy',
style:TextStyle(color: Color(0xffffffff)))
)
)
],
),
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Container(
height: 150,
padding: EdgeInsets.only(top:40),
color: Colors.red,
child: Column(
children: <Widget>[
Image.asset("images/medicine.jpg"),
Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding:EdgeInsets.only(top:25),
child:Flexible(
child:Text('Medicine', style: TextStyle(color: Colors.white)),
),
),
],
),
),
],
)
),
),
],
),
],
),
我使用Flexible
的原因是我希望在必要时将文本包装成多行。
但是我得到这个错误:
════════小部件库捕获到异常═══════════════════════════════════ ════════════════════抛出以下断言来构建Container(padding:EdgeInsets(0.0,40.0,0.0,0.0),bg:BoxDecoration(color:MaterialColor(主值:Color(0xfff44336))))约束:BoxConstraints(0.0 <= w <= Infinity ,h = 150.0)):不正确使用ParentDataWidget。
Flexible widget必须直接放置在Flex widget中。Flexible(无深度,flex:1,脏)具有Flex祖先,但它们之间还有其他小部件:-填充(填充:EdgeInsets(0.0,25.0,0.0,0.0))这些小部件不能介于Flex及其Flex之间。有问题的Flexible的父级的所有权链为:填充←行←中心←列←填充←DecoratedBox←ConstrainedBox←容器←展开←行←⋯
所以我如何正确包装文本? 没有包装问题,代码就可以正常工作。
编辑:我的预期布局似乎类似于下图:
Edit2:让我给您一个关于布局的更精确的想法:
Padding(
padding: const EdgeInsets.all(8.0),
child: Material(
elevation: 5.0,
child: Container(
// height: 220,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
padding: EdgeInsets.symmetric(horizontal: 8.0),
height: 25,
color: Color(0xff6898F7),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Online Pharmacy',
style: TextStyle(
color: Color(0xffffffff),
),
),
Text(
'your hidden text lol',
style: TextStyle(
color: Color(0xffffffff),
),
),
],
),
),
Container(
height: 150.0,
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets.all(8.0),
child: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
// you could use icon instead of image
// Container(
// height: 80,
// child: Image.asset(
// "images/medicine.jpg",
// fit: BoxFit.fill,
// ),
// ),
Icon(
Icons.touch_app,
size: 40.0,
),
SizedBox(height: 10.0),
Flexible(
child: Text(
'Browse Through Database',
textAlign: TextAlign.center,
))
],
),
),
),
Expanded(
child: Container(
padding: EdgeInsets.all(8.0),
child: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
// you could use icon instead of image
// Container(
// height: 80,
// child: Image.asset(
// "images/medicine.jpg",
// fit: BoxFit.fill,
// ),
// ),
Icon(
Icons.input,
size: 40.0,
),
SizedBox(height: 10.0),
Flexible(
child: Text(
'Type your own medicine',
textAlign: TextAlign.center,
))
],
),
),
),
Expanded(
child: Container(
padding: EdgeInsets.all(8.0),
child: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
// you could use icon instead of image
// Container(
// height: 80,
// child: Image.asset(
// "images/medicine.jpg",
// fit: BoxFit.fill,
// ),
// ),
Icon(
Icons.image,
size: 40.0,
),
SizedBox(height: 10.0),
Flexible(
child: Text(
'Picture of your prescription',
textAlign: TextAlign.center,
))
],
),
),
),
],
),
),
],
)),
),
)