【发布时间】：2021-01-12 17:15:50
【问题描述】：
我在编辑用户个人资料屏幕上工作，我需要创建一个 Row，它应该采用两个 RadioListTile 小部件来表示性别。但在列表视图中添加行后，一切都消失了，我得到了这个错误
2: 'child.hasSize': is not true.
I/flutter (31410): Another exception was thrown: NoSuchMethodError: The
getter 'scrollOffsetCorrection' was called on null.
I/flutter (31410): Another exception was thrown: NoSuchMethodError: The
method 'debugAssertIsValid' was called on null.
I/flutter (31410): Another exception was thrown: NoSuchMethodError: The
getter 'visible' was called on null.
我真的不明白，如果我将它们作为列小部件的直接子级，它工作正常，但我需要将性别放在一行内，尝试搜索解决方案但找不到任何解决方案，请帮助伙计们，这是我下面的代码
class EditUserProfile extends StatefulWidget {
static String id = 'edit-profile';
@override
_EditUserProfileState createState() => _EditUserProfileState();
}
enum Gender { male, female }
class _EditUserProfileState extends State<EditUserProfile> {
Gender _gender = Gender.male;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.white,
iconTheme: IconThemeData(color: Colors.black),
title: Text(
"Edit Profile",
style: TextStyle(color: Colors.black),
),
actions: [
Padding(
padding: const EdgeInsets.all(8.0),
child: RaisedButton(
onPressed: null,
child: Text('Done'),
),
)
],
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: ListView(
children: [
InputField(
icon: Icon(
Icons.person,
color: Colors.white,
),
showText: true,
labelText: 'Nickname',
hintText: 'What do they call you?',
),
SizedBox(
height: 10,
),
InputField(
icon: Icon(
Icons.phone_in_talk,
color: Colors.white,
),
showText: true,
labelText: 'Mobile Number',
hintText: 'How can people reach your cell?',
),
SizedBox(
height: 10,
),
InputField(
icon: Icon(
FontAwesomeIcons.child,
color: Colors.white,
),
showText: true,
labelText: 'Age',
hintText: 'How old are you?',
),
SizedBox(
height: 10,
),
InputField(
icon: Icon(
Icons.person,
color: Colors.white,
),
showText: true,
labelText: 'Gender',
hintText: 'Are you single or married?',
),
SizedBox(
height: 10,
),
Expanded(
child: Row(
children: [
RadioListTile<Gender>(
title: Text('Male'),
value: Gender.male,
groupValue: _gender,
onChanged: (Gender value) {
setState(() {
_gender = value;
});
},
),
RadioListTile<Gender>(
title: Text('Female'),
value: Gender.female,
groupValue: _gender,
onChanged: (Gender value) {
setState(() {
_gender = value;
});
},
),
],
),
),
InputField(
icon: Icon(
FontAwesomeIcons.locationArrow,
color: Colors.white,
),
showText: true,
labelText: 'Lives In',
hintText: 'Where do you reside',
),
SizedBox(
height: 10,
),
InputField(
icon: Icon(
Icons.person,
color: Colors.white,
),
showText: true,
labelText: 'Relationship Status',
hintText: 'Are you single or married?',
),
SizedBox(
height: 10,
),
Expanded(
child: Row(
children: [
RadioListTile<Gender>(
title: Text('Male'),
value: Gender.male,
groupValue: _gender,
onChanged: (Gender value) {
setState(() {
_gender = value;
});
},
),
RadioListTile<Gender>(
title: Text('Female'),
value: Gender.female,
groupValue: _gender,
onChanged: (Gender value) {
setState(() {
_gender = value;
});
},
),
],
),
),
],
),
),
);
}
}
我尝试为我的列设置一个固定的高度和宽度，但仍然没有成功。
child: Expanded(
child: Container(
width: double.infinity,
height: 200,
child: ListView(
children: [
InputField(
icon: Icon(
Icons.person,
color: Colors.white,
),
【问题讨论】：
-
谢谢，我早先看到并尝试了所有三种方法，但似乎都没有。最后一种方法执行热重载时出现以下错误... /I/flutter (32208): ══╡ 渲染库╞══════════════════ ═══════════════════════════════════════ I/flutter (3222)在 performLayout() 期间抛出：I/flutter (32208): BoxConstraints 强制无限宽度。 I/flutter (32208)：这些无效的约束被提供给 RenderParagraph 的 layout()
-
你能发布一个可执行代码吗，我收到错误：InputField & FontAwesomeIcons