我只想将int和boolean从一个类传递给另一个类。对于可以在第二页的应用程序栏中显示的特定整数,需要根据布尔值(真/假)更改背景色。
在导航器中,您可以将要发送的数据或对象传递给其他类。
例如,
// Data need to sent second screen class Person { final String name; final String age; Person(this.name, this.age); } // Navigate to second screen with data Navigator.push(context, new MaterialPageRoute(builder: (context) => new SecondScreenWithData(person: new Person("Priyank","28"))));
在SecondScreenWithData课堂上,您可以通过以下方式获取传递的数据。
SecondScreenWithData
class SecondScreenWithData extends StatelessWidget { // Declare a field that holds the Person data final Person person; // In the constructor, require a Person SecondScreenWithData({Key key, @required this.person}) : super(key: key); @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text("Second Screen With Data"), ), body: new Center( child: new Column( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: <Widget>[ // Display passed data from first screen new Text("Person Data \nname: ${person.name} \nage: ${person.age}"), new RaisedButton( child: new Text("Go Back!"), onPressed: () { // Navigate back to first screen when tapped! Navigator.pop(context); } ), ], ) ), ); }
查看完整的导航演示