Flutter 基础（五）Route 路由以及页面间传值
Route 路由以及页面间传值
- 一种页面跳转机制
- 路由 Route 对应到 Android 就是 Intent
- Flutter 路由分两种：新建路由、注册路由
- 需要Route表示 Navigator进行管理
- 跳转页面 Navigator.push()
- 返回页面 Navigator.pop()
- 传值
1.新建路由
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Route Demo',
home: Scaffold(
appBar: AppBar(
title: Text('Route Demo'),
),
body: FirstPage(),
),
);
}
}
class FirstPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Container(
width: double.infinity,
color: Colors.redAccent[100],
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'当前页面 FirstPage',
style: TextStyle(
fontSize: 32,
color: Colors.white,
),
),
RaisedButton(
color: Colors.blue,
child: Text(
'去下一个页面',
style: TextStyle(
color: Colors.white,
),
),
onPressed: () {
//新建路由跳转页面
Navigator.push(context, MaterialPageRoute(builder: (context) {
return SecondPage();
}));
},
),
],
),
);
}
}
class SecondPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
width: double.infinity,
color: Colors.greenAccent[100],
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'当前页面是 SecondPage',
textDirection: TextDirection.ltr,
),
RaisedButton(
child: Text('返回前一个页面'),
onPressed: () {
//返回上一个页面
Navigator.pop(context);
},
),
],
),
),
);
}
}
2.注册路由
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Route Demo',
// initialRoute: '/First',
routes: {
//注册路由
'/First': (context) => FirstPage(),
'/Second': (context) => SecondPage(),
},
home: FirstPage(),
);
}
}
class FirstPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('FirstPage'),
),
body: Container(
width: double.infinity,
color: Colors.redAccent[100],
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'当前页面 FirstPage',
style: TextStyle(
fontSize: 32,
color: Colors.white,
),
),
RaisedButton(
color: Colors.blue,
child: Text(
'去下一个页面',
style: TextStyle(
color: Colors.white,
),
),
onPressed: () {
//注册路由跳转页面 注意名字不要写错
Navigator.pushNamed(context, '/Second');
},
),
],
),
),
);
}
}
class SecondPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
width: double.infinity,
color: Colors.greenAccent[100],
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'当前页面是 SecondPage',
textDirection: TextDirection.ltr,
),
RaisedButton(
child: Text('返回前一个页面'),
onPressed: () {
Navigator.pop(context);
},
),
],
),
),
);
}
}
3.传值(两种方式) 返回值
效果
3.1.新建路由传值
-
通过 MaterialPageRoute settings 参数包装要传递的值
-
RouteSettings 对象的 copyWith() 方法的arguments参数传值
-
具体请看详细代码或者源码
-
var routeSettings = RouteSettings(); //携带第一个页面的参数 var copyWithSettings = routeSettings.copyWith(arguments: _editController.text); Navigator.push( context, MaterialPageRoute( builder: (context) { return SecondPage(); }, settings: copyWithSettings, ));
3.2.注册路由传值
- 比新建路由传值简单，arguments参数中传值
// 注册路由传值
void goNextPage2(BuildContext context) {
Navigator.pushNamed(context, '/Second', arguments: '传递的值');
}
示例代码
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Route Demo',
home: Scaffold(
appBar: AppBar(
title: Text('Route Demo'),
),
body: FirstPage(),
),
);
}
}
class FirstPage extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return FirstPageState();
}
}
class FirstPageState extends State<FirstPage> {
@override
Widget build(BuildContext context) {
var _editController = TextEditingController();
return Container(
width: double.infinity,
color: Colors.redAccent[100],
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'第一个页面(FirstPage)',
style: TextStyle(
fontSize: 32,
color: Colors.white,
),
),
Container(
margin: EdgeInsets.all(20),
child: TextField(
decoration: InputDecoration(
labelText: '请输入传递的值',
labelStyle: TextStyle(color: Colors.white),
),
controller: _editController,
),
),
RaisedButton(
color: Colors.blue,
child: Text(
'去第二个页面',
style: TextStyle(
color: Colors.white,
),
),
onPressed: () {
// 去第二个页面
goNextPage(_editController, context);
},
),
Container(
margin: EdgeInsets.all(20),
child: Text(secondValue,
style: TextStyle(
fontSize: 20,
fontWeight: FontWeight.bold,
color: Colors.blue,
)),
),
],
),
);
}
var secondValue = '第二个页面传递的值是: ';
// 新建路由传值
void goNextPage(
TextEditingController _editController, BuildContext context) async {
var routeSettings = RouteSettings();
//携带第一个页面的参数
var copyWithSettings =
routeSettings.copyWith(arguments: _editController.text);
//返回第二个页面的参数
var valueFromSecondPage = await Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return SecondPage();
},
settings: copyWithSettings,
));
debugPrint('valueFromSecondPage = $valueFromSecondPage');
setState(() {
secondValue = secondValue + "$valueFromSecondPage";
});
}
}
// 注册路由传值
void goNextPage2(BuildContext context) {
Navigator.pushNamed(context, '/Second', arguments: '传递的值');
}
class SecondPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
var passValue = ModalRoute.of(context).settings.arguments;
return Scaffold(
body: Container(
width: double.infinity,
color: Colors.orange[100],
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'第二个页面(SecondPage)',
style: TextStyle(
fontSize: 32,
color: Colors.white,
),
textDirection: TextDirection.ltr,
),
Container(
margin: EdgeInsets.all(20),
child: Text(
'上一个页面传递的值是: $passValue',
style: TextStyle(
fontSize: 20,
color: Colors.redAccent,
),
textDirection: TextDirection.ltr,
),
),
RaisedButton(
child: Text('返回前一个页面'),
onPressed: () {
//第二个参数是返回值 这个值是 Object 对象的类型
Navigator.pop(context, "第一个页面你好!");
},
),
],
),
),
);
}
}
4.源码地址
https://github.com/jhbxyz/flutter_learn_art/tree/master/lib/ext/day1_route
5.文章
https://github.com/jhbxyz/flutter_learn_art/blob/master/article/Route.md