Flutter 如何相互约束不同行的项？
下面是我想要实现的屏幕截图 下面是我的Flutter 如何相互约束不同行的项？,flutter,dart,android-constraintlayout,Flutter,Dart,Android Constraintlayout,下面是我想要实现的屏幕截图 下面是我的flatter代码 Row( children: <Widget>[ const MyProfileText( text: "Name", ), const MyProfileText( text: ":",
flatterRow(
children: <Widget>[
const MyProfileText(
text: "Name",
),
const MyProfileText(
text: ":",
),
const SizedBox(
width: 4,
),
Flexible(
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(
cursorColor: black1,
style: buildTextStyle(),
decoration: buildTextDecoration(),
),
),
)
],
),
行(
儿童：[
常量MyProfileText(
文字：“姓名”，
),
常量MyProfileText(
正文：“：”，
),
常量大小框(
宽度：4，
),
灵活的(
子：容器(
身高：30，
填充：仅限常量边设置(
右:10,，
),
孩子：TextField(
颜色：黑色1，
样式：buildTextStyle（），
装饰：buildTextEncoration（），
),
),
)
],
),
列小部件正如您所看到的，由于标签名称的长度不同，textfield在所有三种情况下的宽度都不相等。我知道我可以在标签和文本字段之间使用宽度不同的
SizedBoxtextfield约束布局可以将左侧元素也放在灵活的行中，这样根行将有两个宽度相同的灵活的项
下面是一个简单的例子：
Row(
children: <Widget>[
Flexible(
child: Row(
children: <Widget>[
Text("Name"),
Text(":"),
SizedBox(width: 4),
],
),
),
Flexible(
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
)
您可以将小部件包装在第行的“：”文本（文本、大小框和灵活小部件）之后。然后，您需要将刚刚创建的行和“Name”文本小部件与扩展的小部件包装在一起。代码如下：
Row(
children: <Widget>[
Expanded(
child: const MyProfileText(
text: "Name",
),
),
Expanded(
child: Row(
children: <Widget>[
const MyProfileText(
text: ":",
),
const SizedBox(
width: 4,
),
Flexible(
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(
cursorColor: black1,
style: buildTextStyle(),
decoration: buildTextDecoration(),
),
),
)
],
),
),
],
),
行(
儿童：[
扩大(
子：const MyProfileText(
文字：“姓名”，
),
),
扩大(
孩子：排(
儿童：[
常量MyProfileText(
正文：“：”，
),
常量大小框(
宽度：4，
),
灵活的(
子：容器(
身高：30，
填充：仅限常量边设置(
右:10,，
),
孩子：TextField(
颜色：黑色1，
样式：buildTextStyle（），
装饰：buildTextEncoration（），
),
),
)
],
),
),
],
),
您可以在展开中更改flex以更改每个零件的大小。您需要展开和flex，您可以复制粘贴完整代码以检查它
使用flex number可调整文本和文本字段之间的大小
代码片段
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Name",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
行(
儿童：[
扩大(
弹性：1，
孩子：排(
mainAxisAlignment:mainAxisAlignment.spaceBetween，
儿童：[
正文(
“姓名”，
),
正文(
":",
),
],
),
),
常量大小框(
宽度：4，
),
扩大(
弹性：1，
子：容器(
身高：30，
填充：仅限常量边设置(
右:10,，
),
子项：TextField（），
),
)
],
),
完整代码
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Name",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Email",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Mobile Number",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Address",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
],
),
),
// This trailing comma makes auto-formatting nicer for build methods.
);
}
}
导入“包装：颤振/材料.省道”；
void main（）=>runApp（MyApp（））；
类MyApp扩展了无状态小部件{
//此小部件是应用程序的根。
@凌驾
小部件构建（构建上下文）{
返回材料PP(
标题：“颤振演示”，
主题：主题数据(
//这是应用程序的主题。
//
//尝试使用“flutter run”运行应用程序。您将看到
//应用程序有一个蓝色工具栏。然后，在不退出应用程序的情况下，重试
//将下面的primarySwatch更改为Colors.green，然后调用
//“热重新加载”（在运行“颤振运行”的控制台中按“r”，
//或者只需将更改保存到颤振IDE中的“热重新加载”。
//请注意，计数器没有重置回零；应用程序
//未重新启动。
主样本：颜色。蓝色，
),
主页：MyHomePage（标题：“颤振演示主页”），
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage（{Key，this.title}）：超级（Key:Key）；
//此小部件是应用程序的主页。它是有状态的，表示
//它有一个状态对象（定义如下），其中包含影响
//看起来怎么样。
//此类是状态的配置。它保存值（在此
//案例名称）由家长（在本例中为应用程序小部件）提供，以及
//由State的build方法使用。小部件子类中的字段包括
//始终标记为“最终”。
最后的字符串标题；
@凌驾
_MyHomePageState createState（）=>\u MyHomePageState（）；
}
类_MyHomePageState扩展状态{
int _计数器=0；
void _incrementCounter（）{
设置状态（）{
//这个对setState的调用告诉颤振框架，某些东西
//已在此状态下更改，这将导致它重新运行下面的生成方法
//以便显示能够反映更新的值。如果我们更改
//你的柜台
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Name",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Email",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Mobile Number",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
Row(
children: <Widget>[
Expanded(
flex: 1,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Address",
),
Text(
":",
),
],
),
),
const SizedBox(
width: 4,
),
Expanded(
flex: 1,
child: Container(
height: 30,
padding: const EdgeInsets.only(
right: 10,
),
child: TextField(),
),
)
],
),
],
),
),
// This trailing comma makes auto-formatting nicer for build methods.
);
}
}