在我的专栏中,我希望所有孩子的身高都达到孩子的最大身高。 我可以在 Column 中使用 IntrinsicWidth 来实现宽度。但 IntrinsicHeight 在 Column 中不起作用。这是我的代码:
// IntrinsicHeight + Column
// flutter IntrinsicHeight not working with Column
import 'package:flutter/material.dart';
void main(){
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: HomeScreen(),
);
}
}
class HomeScreen extends StatefulWidget {
const HomeScreen({super.key});
@override
State<HomeScreen> createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('IntrinsicHeight + Column'),backgroundColor: Colors.blue,),
body: Center(
child: Container(
width: 300,
height: 500,
color: Colors.amber[50],
child: IntrinsicHeight(
child: Column(
//crossAxisAlignment: CrossAxisAlignment.stretch,
children: List.generate(5, (i)=>Container(width: (i+1)*10, height: (i+1)*10, color: Colors.green, margin: const EdgeInsets.all(2),)),
),
),
),
),
);
}
}
IntrinsicHeight 在 Column 中起作用吗?
是的
IntrinsicHeight
可与 Columns
配合使用。
要使
Column
中的孩子的身高与最长的孩子的身高相同,您必须:
Column
包裹 IntrinsicHeight
,并用 Expanded
小部件包裹子项。说明:
IntrinsicHeight
:小部件将确保Column
中的所有子项将占据最高子项的高度。
Expanded
小部件可确保所有子级均等扩展以占用 IntrinsicHeight 提供的可用空间。
这里有一段代码显示:
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
//brightness: Brightness.dark,
),
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
const MyHomePage({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: IntrinsicHeight(
child: Column(
//crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Expanded(
child: Container(
height: 10,
color: Colors.red,
child: const Text('Short widget'),
),
),
Expanded(
child: Container(
height: 50,
color: Colors.blue,
child: const Text('long widget'),
),
),
Expanded(
child: Container(
height: 10,
color: Colors.green,
child: const Text('Short widget'),
),
),
],
),
),
),
);
}
}
这是您编辑的代码,以使小部件的高度相等:
注:
Container
的高度,因此 Column
和 Container
只取孩子们的高度。// IntrinsicHeight + Column
// flutter IntrinsicHeight not working with Column
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
debugShowCheckedModeBanner: false,
home: HomeScreen(),
);
}
}
class HomeScreen extends StatefulWidget {
const HomeScreen({super.key});
@override
State<HomeScreen> createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('IntrinsicHeight + Column'),
backgroundColor: Colors.blue,
),
body: Center(
child: Container(
width: 300,
//height: 500,
color: Colors.amber[50],
child: IntrinsicHeight(
child: Column(
//crossAxisAlignment: CrossAxisAlignment.stretch,
children: List.generate(
5,
(i) => Expanded(
child: Container(
width: (i + 1) * 10,
height: (i + 1) * 10,
color: Colors.green,
margin: const EdgeInsets.all(2),
),
),
),
),
),
),
),
);
}
}
希望有帮助。