Flutter配置路由组件抽离及页面传参

在lib目录下新建个routes文件夹，里面新建个Routes.dart文件来统一管理我们的路由跳转及传参，
在这里我们就以Home.dart文件跳转到Search.dart文件并传参为例

Routes.dart

import 'package:flutter/material.dart';
import '../pages/Tabs.dart';
import '../pages/Search.dart'; //需要引入跳转页面地址

// 配置路由
final routes = {
  // 前面是自己的命名 后面是加载的方法
  '/': (context) => Tabs(), //不用传参的写法
  '/search': (context, {arguments}) =>
      SearchPage(arguments: arguments), //需要传参的写法
};

// 固定写法，统一处理，无需更改
var onGenerateRoute = (RouteSettings settings) {
  final String name = settings.name;
  final Function pageContentBuilder = routes[name];
  if (pageContentBuilder != null) {
    if (settings.arguments != null) {
      final Route route = MaterialPageRoute(
          builder: (context) =>
              pageContentBuilder(context, arguments: settings.arguments));
      return route;
    } else {
      final Route route =
          MaterialPageRoute(builder: (context) => pageContentBuilder(context));
      return route;
    }
  }
};

还需要在main.dart入口文件进行配置

import 'package:flutter/material.dart'; //快捷方式:fim
import 'routes/Routes.dart'; //引入配置的路由文件

void main() {
  runApp(MyApp());
}

//自定义组件
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
        initialRoute: '/', //初始化加载的路由
        onGenerateRoute: onGenerateRoute
    );
  }
}

Home.dart

import 'package:flutter/material.dart';

class HomePage extends StatefulWidget {
  HomePage({Key key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        RaisedButton(
            child: Text("跳转到搜索页面"),
            onPressed: () {
              Navigator.pushNamed(context, '/search',
                 //在arguments里面带上我们需要传参值
                  arguments: {"id": 123, "name": "zz"});
            },
            color: Theme.of(context).accentColor,
            textTheme: ButtonTextTheme.primary),
      ],
    );
  }
}

Search.dart

import 'package:flutter/material.dart';
class SearchPage extends StatefulWidget {
  // 接收上个页面的参数
  Map arguments;
  SearchPage({Key key, this.arguments}) : super(key: key);
  @override
 //参数传递给下面的类
  _SearchPageState createState() => _SearchPageState(arguments: this.arguments);
}

class _SearchPageState extends State<SearchPage> {
  Map arguments;
  _SearchPageState({this.arguments});
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        floatingActionButton: FloatingActionButton(
          child: Text('返回'),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
        appBar: AppBar(
          title: Text("搜索"),
        ),
        //页面上就显示我们获取上个页面的参数
        body: Text("${arguments['id']}${arguments['name']}"));
  }
}