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| import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class Todo {
final String title;
final String description;
Todo(this.title, this.description);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),
routes: <String, WidgetBuilder>{
"/nameRoute": (BuildContext context) => new SecondPage(),
'/a': (BuildContext context) => new MyPage(title: 'A 页面'),
'/b': (BuildContext context) => new MyPage(title: 'B 页面'),
'/c': (BuildContext context) => new MyPage(title: 'C 页面'),
},
);
}
}
class MyPage extends StatelessWidget {
MyPage({Key key, this.title}) : super(key: key);
final String title;
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(title: new Text(title)),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("演示跳转"),
),
body: new Center(
child: new Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
new FlatButton(
onPressed: () {
print("点击跳转啊");
Navigator.pushNamed(context, "/nameRoute");
// Navigator.of(context).pushNamed('/nameRoute');
},
child: new Text("直接使用name跳转")),
new FlatButton(
onPressed: () {
Navigator.push<String>(context,
new MaterialPageRoute(builder: (BuildContext context) {
return new ThirdPage(title: "请输入昵称");
})).then((String result) {
showDialog(
context: context,
builder: (BuildContext context) {
return new AlertDialog(
content: new Text("您输入的昵称为:$result"),
);
});
});
},
child: new Text("跳转传参并返回值")),
new RaisedButton(
child: new Text('A按钮'),
onPressed: () {
// Navigator.of(context).pushNamed('/a');
Navigator.push(
context,
new MaterialPageRoute(
builder: (context) => new DetailScreen(todo: new Todo("哈哈","嘻嘻")),
),
);
},
),
new RaisedButton(
child: new Text('B按钮'),
onPressed: () {
Navigator.of(context).pushNamed('/b');
},
),
new RaisedButton(
child: new Text('C按钮'),
onPressed: () {
Navigator.of(context).pushNamed('/c');
},
)
],
),
),
);
}
}
class DetailScreen extends StatelessWidget {
// Declare a field that holds the Todo
final Todo todo;
// In the constructor, require a Todo
DetailScreen({Key key, @required this.todo}) : super(key: key);
@override
Widget build(BuildContext context) {
// Use the Todo to create our UI
return new Scaffold(
appBar: new AppBar(
title: new Text("${todo.title}"),
),
body: new Padding(
padding: new EdgeInsets.all(16.0),
child: new Text('${todo.description}'),
),
);
}
}
class SecondPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("第二页"),
),
body: new Center(
child: new FlatButton(
onPressed: () {
Navigator.pop(context);
},
child: new Text("return")),
),
);
}
}
class ThirdPage extends StatefulWidget {
final String title;
ThirdPage({this.title});
@override
State<StatefulWidget> createState() {
return new _ThirdPageState();
}
}
class _ThirdPageState extends State<ThirdPage> {
TextEditingController controller;
@override
void initState() {
controller = new TextEditingController();
super.initState();
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Column(
children: <Widget>[
new TextField(
decoration: new InputDecoration(labelText: "请输入昵称"),
controller: controller,
),
new RaisedButton(
color: Colors.blueAccent,
onPressed: () {
if (controller.text == '') {
showDialog(
context: context,
builder: (BuildContext context) => new AlertDialog(
title: new Text("请输入昵称"),
));
return;
}
Navigator.pop(context, controller.text);
},
child: new Text("OK"))
],
),
);
}
}
|
