当我在代码中使用Sizedbox时，它会显示红线批注和错误。我正在使用安卓工作室开发flutter应用程序。这是我正在创建的登录UI。https://www.youtube.com/watch?v=PqZgkU_SZAE&t=111s我指的是这个youtube视频。有人能解释一下为什么会这样吗
在此处输入图像描述错误：此SizedBox(高度：50(之前应为"，"，错误：找不到方法："Sizedbox"。
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import'package:flutter/services.dart';
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() => _LoginScreenState();
}
Widget buildEmail(){
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
'Email',
style: TextStyle(
color: Colors.white,
fontSize: 16,
fontWeight: FontWeight.bold
),
)
**Sizedbox (height:10),** //error
Container(
alignment: Alignment.centerLeft,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
boxShadow: [
BoxShadow(
color:Colors.black26,
blurRadius: 6,
offset :Offset(0,2)
)
]
),
height:60,
child: TextField(
keyboardType: TextInputType.emailAddress,
)
)
]
);
}
class _LoginScreenState extends State <LoginScreen> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: AnnotatedRegion<SystemUiOverlayStyle> (
value: SystemUiOverlayStyle.light,
child: GestureDetector(
child: Stack(
children: <Widget>[
Container(
height: double.infinity,
width: double.infinity,
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
colors:[
Color(0x665ac18e),
Color(0x995ac18e),
Color(0xcc5ac18e),
Color(0xff5ac18e),
]
)
),
child:Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'Sign In',
style: TextStyle(
color: Colors.white,
fontSize: 40,
fontWeight: FontWeight.bold
),
)
**SizedBox(height: 50),** //error
buildEmail(),
],
)
)
],
),
),
),
);
}
}
您使用这个
Text(
'Sign In',
style: TextStyle(
cbuildEmail(),olor: Colors.white,
fontSize: 40,
fontWeight: FontWeight.bold),
),
SizedBox(height: 50),
buildEmail(),
在SizedBox()之前添加逗号(，(
上一篇：
) SizedBox(height:10), //error
正确：
), SizedBox(height:10), //debugged
您缺少commma(，(，并将Sizedbox更改为SizedBox执行以下操作：
Text(
'Email',
style: TextStyle(
color: Colors.white,
fontSize: 16,
fontWeight: FontWeight.bold
),
) , //you are missing comma here
SizedBox(height: 50),