flutter圆角
2019-10-18 本文已影响0人
寒云暮雨
有的时候我们需要给图片或者背景添加圆角,我们怎么做呢?
效果截图

代码示例
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(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'flutter圆角'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
child: ListView(
children: <Widget>[
ClipRRect(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(20),
bottomRight: Radius.circular(20),
),
child: Image.asset("images/big.jpg"),
),
Divider(
height: 2,
),
ClipRRect(
borderRadius: BorderRadius.circular(20),
child: Image.asset("images/big.jpg"),
),
Divider(
height: 2,
),
Container(
decoration: ShapeDecoration(
image: DecorationImage(
image: AssetImage("images/big.jpg"),
fit: BoxFit.fitWidth,
),
shape: RoundedRectangleBorder(
borderRadius: BorderRadiusDirectional.circular(20)),
),
width: double.maxFinite,
height: 300,
child: Align(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
"Container decoration实现圆角(radius = 20)",
style: TextStyle(color: Colors.white),
),
),
alignment: Alignment.bottomCenter,
),
),
ClipRRect(
borderRadius: BorderRadius.circular(20),
child: Image.asset("images/big.jpg"),
),
Card(
shape: RoundedRectangleBorder(
borderRadius: BorderRadiusDirectional.circular(20),
),
clipBehavior: Clip.antiAlias,
child: Image.asset(
"images/big.jpg",
width: double.maxFinite,
),
),
],
)), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
1、灵活定义圆角。我们定义了左上角和右下角的圆角
ClipRRect(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(20),
bottomRight: Radius.circular(20),
),
child: Image.asset("images/big.jpg"),
),
2、四周弧度相同的圆角。
ClipRRect(
borderRadius: BorderRadius.circular(20),
child: Image.asset("images/big.jpg"),
),
3、背景圆角弧度相同
Container(
decoration: ShapeDecoration(
image: DecorationImage(
image: AssetImage("images/big.jpg"),
fit: BoxFit.fitWidth,
),
shape: RoundedRectangleBorder(
borderRadius: BorderRadiusDirectional.circular(20)),
),
width: double.maxFinite,
height: 300,
child: Align(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
"Container decoration实现圆角(radius = 20)",
style: TextStyle(color: Colors.white),
),
),
alignment: Alignment.bottomCenter,
),
),
4、背景灵活定义四周圆角
Container(
decoration: ShapeDecoration(
image: DecorationImage(
image: AssetImage("images/big.jpg"),
fit: BoxFit.fitWidth,
),
shape: RoundedRectangleBorder(
borderRadius: BorderRadiusDirectional.only(
topStart: Radius.circular(20),
bottomEnd: Radius.circular(20),
),
),
),
width: double.maxFinite,
height: 300,
child: Align(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
"Container decoration实现圆角(radius = 20)",
style: TextStyle(color: Colors.white),
),
),
alignment: Alignment.bottomCenter,
),
),
5、card圆角
Card(
shape: RoundedRectangleBorder(
borderRadius: BorderRadiusDirectional.circular(20),
),
clipBehavior: Clip.antiAlias,
child: Image.asset(
"images/big.jpg",
width: double.maxFinite,
),
),