Flutter(五)--Navigator&页面传值Flutter(五)--Navigator&页面传值

Widget build(BuildContext context) {
      return Container(
        child: RaisedButton(
          child: Text('push'),
          onPressed: () => Navigator.of(context).push(MaterialPageRoute(
              builder: (content) {
            return deee(str: 'demo');
          },
      )),
    ),
  );
}
    

class deee extends StatelessWidget {
  final Sting str;
  
  //带参数的组件初始化方式
  const _ListTodoDetail({Key key,@required this.str}) : super(key: key);
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title:Text('${this.str}'),
        ),
    );
  }
}

  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: RaisedButton(
              child: Text('push'),
//pop回来的值类型为Future，必须使用await来获取，而await必须在async异步线程中使用
              onPressed: () async {
                Future va = await Navigator.of(context).push(MaterialPageRoute(
                  builder: (context) => _PopPage()
                ));
          //输出：we are coming'
                print('$va');
            }),));
  }
}

Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title:Text('pop'),
        ),
      body: Center(
        child: Center(
          child: RaisedButton(
              child: Text('pop'),
              onPressed: () => Navigator.of(context).pop('we are coming'),
            ),)));
  }

return MaterialApp(
      title: 'Demo',
      routes: {
        '/back': (context) => Navigator.of(context).pop(),
      }
)
//任意位置调用：
Navigator.pushNamed(context, '/back');

Navigator(
        key: _navigatorKey,
        initialRoute: 'signup/username',
        onGenerateRoute: (settings) {
          WidgetBuilder builder;
          switch (settings.name) {
            case 'signup/username':
              builder = (_) => _UsernamePage();
              break;
            case 'signup/password':
              builder = (_) => _PasswordPage();
              break;
    );
    }
       return MaterialPageRoute(builder: builder, settings: settings);
        },
    )
    //在当前navigation下任意位置调用:
    Navigator.of(context).pushNamed('signup/password')