Flutter中Navigator 跳转传参数和反向传参数

初始化路由

 MaterialApp(
  routes: {
    "/Second": (BuildContext context){
      return Second("");
    }
  },

跳转传参数

String va = await Navigator.of(context).push(MaterialPageRoute(
    builder: (content) {
  return Second( 'demo');
},
));

print('回掉=====$va');

class Second extends StatelessWidget {
  final String str;

  const Second(this.str, {Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: () {
         Navigator.of(context).pop("asdadad");
      },
      child: Text("第二个${str}"),
    );
  }
}