我正在建立一个包含4-5个表单域的表单。但是，当我尝试输入数据时，它将引发以下错误
<template>
<v-data-table
:headers="headers"
:items="desserts"
:items-per-page="5"
class="elevation-1"
></v-data-table>
</template>
这是我的代码
Performing hot reload...
Syncing files to device sdk gphone x86 64...
Reloaded 3 of 512 libraries in 363ms.
W/IInputConnectionWrapper(21437): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper(21437): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper(21437): getTextAfterCursor on inactive InputConnection
W/IInputConnectionWrapper(21437): beginBatchEdit on inactive InputConnection
W/IInputConnectionWrapper(21437): endBatchEdit on inactive InputConnection
════════ Exception caught by rendering library ═════════════════════════════════════════════════════
The following assertion was thrown during layout:
A RenderFlex overflowed by 192 pixels on the bottom.
The relevant error-causing widget was:
Column file:///C:/Users/xyz/Documents/quizmaker/lib/views/signup.dart:54:20
The overflowing RenderFlex has an orientation of Axis.vertical.
The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the RenderFlex to fit within the available space instead of being sized to their natural size.
This is considered an error condition because it indicates that there is content that cannot be seen. If the content is legitimately bigger than the available space, consider clipping it with a ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex, like a ListView.
The specific RenderFlex in question is: RenderFlex#322a5 relayoutBoundary=up2 OVERFLOWING
... needs compositing
... parentData: offset=Offset(24.0, 0.0) (can use size)
... constraints: BoxConstraints(0.0<=w<=363.4, 0.0<=h<=321.1)
... size: Size(363.4, 321.1)
... direction: vertical
... mainAxisAlignment: start
... mainAxisSize: min
... crossAxisAlignment: start
... textDirection: ltr
... verticalDirection: down
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我尝试将Expanded添加到子项中，它消除了错误，但是在输入数据时表单字段变得很小。尝试了SingleChildScrollView中的换行列，但以下内容为我提供
RenderFlex子级的flex为非零值，但传入的高度限制不受限制
有人能暗示我做错了什么吗？
谢谢！
答案 0 :(得分：2)
您必须将Form小部件包装在SingleChildScrollView中。另外，请注意，添加SingleChildScrollView之后没有固定高度，因此您不能使用spacer小部件。取而代之的是，您可以使用SizedBox小部件在上方留出一些空间。
final _formKey = GlobalKey<FormState>();
String sName, fName, lName, email, phone, password;
AuthService authService = new AuthService();
bool _isLoading = false;
signUp() async {
if (_formKey.currentState.validate()) {
setState(() {
_isLoading = true;
});
authService.signUpWithEmailAndPass(email, password).then((value) {
if (value != null) {
setState(() {
_isLoading = false;
});
Navigator.pushReplacement(
context, MaterialPageRoute(builder: (context) => Home()));
}
});
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: appBar(context),
centerTitle: true,
backgroundColor: Colors.transparent,
elevation: 0.0,
brightness: Brightness.light,
),
body: _isLoading
? Container(
child: Center(
child: CircularProgressIndicator(),
),
)
: SingleChildScrollView(
child: Form(
key: _formKey,
child: Container(
padding: EdgeInsets.symmetric(horizontal: 24),
child: Container(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
// here you can't use spacer because their is no fix height, so you have to use SixedBox give some spacing
SizedBox(
height: 50,
),
TextFormField(
validator: (val) {
return val.isEmpty ? "Enter School Name" : null;
},
decoration: InputDecoration(hintText: "School Name"),
onChanged: (val) {
sName = val;
},
),
SizedBox(
height: 6,
),
TextFormField(
validator: (val) {
return val.isEmpty ? "Enter First Name" : null;
},
decoration: InputDecoration(hintText: "First Name"),
onChanged: (val) {
fName = val;
},
),
SizedBox(
height: 6,
),
TextFormField(
validator: (val) {
return val.isEmpty ? "Enter Last Name" : null;
},
decoration: InputDecoration(hintText: "Last Name"),
onChanged: (val) {
lName = val;
},
),
SizedBox(
height: 6,
),
TextFormField(
validator: (val) {
return val.isEmpty ? "Enter Emailid" : null;
},
decoration: InputDecoration(hintText: "Email"),
onChanged: (val) {
email = val;
},
),
SizedBox(
height: 6,
),
TextFormField(
validator: (val) {
return val.isEmpty ? "Enter Phone Number" : null;
},
decoration: InputDecoration(hintText: "Phone"),
onChanged: (val) {
phone = val;
},
),
SizedBox(
height: 6,
),
TextFormField(
obscureText: true,
validator: (val) {
return val.isEmpty ? "Enter Password" : null;
},
decoration: InputDecoration(hintText: "Password"),
onChanged: (val) {
password = val;
},
),
SizedBox(
height: 24,
),
GestureDetector(
onTap: () {
signUp();
},
child: Container(
padding: EdgeInsets.symmetric(vertical: 18),
decoration: BoxDecoration(
color: Colors.blue,
borderRadius: BorderRadius.circular(30)),
alignment: Alignment.center,
width: MediaQuery.of(context).size.width - 48,
child: Text(
"Register",
style:
TextStyle(color: Colors.white, fontSize: 16),
),
),
),
SizedBox(
height: 18,
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
"Already have an account? ",
style: TextStyle(fontSize: 15.5),
),
GestureDetector(
onTap: () {
Navigator.pushReplacement(
context,
MaterialPageRoute(
builder: (context) => SignIn()));
},
child: Text(
"Sign in",
style: TextStyle(
fontSize: 15.5,
decoration: TextDecoration.underline),
))
],
),
SizedBox(
height: 80,
),
],
),
),
),
),
),
);
}
}
答案 1 :(得分：0)
在“ singlechildscrollview”中包裹您的身体。