Flutter 中的路由

Flutter 中的路由通俗的讲就是页面跳转。在 Flutter 中通过 Navigator 组件管理路由导航。

并提供了管理堆栈的方法。如:Navigator.push 和 Navigator.pop
Flutter 中给我们提供了两种配置路由跳转的方式:1、基本路由 2、命名路由

Flutter 中的基本路由使用

例如：

从 HomePage 组件跳转到 SearchPage 组件

1、需要在 HomPage 中引入 SearchPage.dart

import '../SearchPage.dart';

2、在 HomePage 中通过下面方法跳转

RaisedButton(
            child: Text("跳转到搜索页面"),
            onPressed: () {
              //路由跳转
              Navigator.of(context).push(
                MaterialPageRoute(
                  builder: (context)=>SearchPage()
                )
              );

            },
            color: Theme.of(context).accentColor,
            textTheme: ButtonTextTheme.primary
        ),

Flutter 中的基本路由跳转传值

import 'package:flutter/material.dart';

import '../Form.dart';

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

  _CategoryPageState createState() => _CategoryPageState();
}

class _CategoryPageState extends State<CategoryPage> {
  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        RaisedButton(
          child: Text("跳转到表单页面"),
          onPressed: (){

            Navigator.of(context).push(
                MaterialPageRoute(
                  builder: (context)=>FormPage(title:'我是跳转传值')
                )
            );
          },
        )
      ],
    );
  }
}

Flutter 中的命名路由

1、配置路由

import 'package:flutter/material.dart';

import 'pages/Tabs.dart';
import 'pages/Form.dart';
import 'pages/Search.dart';

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home:Tabs(),
      routes: {
        '/form':(context)=>FormPage(),
        '/search':(context)=>SearchPage(),
      }
    );
  }
}

2、路由跳转

import 'package:flutter/material.dart';

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

  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.center,
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        RaisedButton(
            child: Text("跳转到搜索页面"),
            onPressed: () {
              //路由跳转
              Navigator.pushNamed(context, '/search');
            },
            color: Theme.of(context).accentColor,
            textTheme: ButtonTextTheme.primary
        ),
        SizedBox(height: 20),        

      ],
    );
  }
}

Flutter 中的命名路由跳转传值

import 'package:flutter/material.dart';
import 'pages/Tabs.dart';
import 'pages/Search.dart';
import 'pages/Form.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  final routes = {
    '/': (contxt) => Tabs(),
    '/search': (contxt) => SearchPage(),
    '/form': (context, {arguments}) => FormPage(arguments: arguments),
  };
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Tabs(),
        onGenerateRoute: (RouteSettings settings) {
　　　　　　// 统一处理
          final String name = settings.name;
          final Function pageContentBuilder = this.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;
            }
          }
        });
  }
}

传值

import 'package:flutter/material.dart';

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

  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.center,
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        RaisedButton(
            child: Text("跳转到搜索页面"),
            onPressed: () {
              //路由跳转
              Navigator.pushNamed(context, '/search',arguments: {
                "id":123
              });
            },
            color: Theme.of(context).accentColor,
            textTheme: ButtonTextTheme.primary
        ),
        SizedBox(height: 20),
         RaisedButton(
            child: Text("跳转到商品页面"),
            onPressed: () {
              Navigator.pushNamed(context, '/product');
            }
        ),      

      ],
    );
  }
}

接收参数：

import 'package:flutter/material.dart';

class SearchPage extends StatelessWidget {

  final arguments;

  SearchPage({this.arguments});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar:AppBar(
        title: Text("搜索页面"),
      ) ,
      body: Text("搜索页面内容区域${arguments != null ? arguments['id'] : '0'}"),
    );
  }
}

Flutter 中的命名路单独抽离

Routes.dart

import 'package:flutter/material.dart';

import '../pages/Tabs.dart';
import '../pages/Form.dart';
import '../pages/Search.dart';
import '../pages/Product.dart';
import '../pages/ProductInfo.dart';

//配置路由
final routes={
      '/':(context)=>Tabs(),
      '/form':(context)=>FormPage(),
      '/product':(context)=>ProductPage(),
      '/productinfo':(context,{arguments})=>ProductInfoPage(arguments:arguments),
      '/search':(context,{arguments})=>SearchPage(arguments:arguments),
};

//固定写法
var onGenerateRoute=(RouteSettings settings) {
      // 统一处理
      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;
        }
      }
};

main.dart

import 'package:flutter/material.dart';

import 'routes/Routes.dart';

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {  

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      // home:Tabs(),
      initialRoute: '/',     //初始化的时候加载的路由
      onGenerateRoute: onGenerateRoute

    );
  }
}

官方文档:https://flutter.dev/docs/cookbook/navigation/navigate-with-arguments

---

Flutter 中返回到上一级页面

Navigator.of(context).pop();

Flutter 中替换路由

比如我们从用户中心页面跳转到了 registerFirst 页面，然后从 registerFirst 页面通过 pushReplacementNamed 跳转到了 registerSecond 页面。这个时候当我们点击 registerSecond 的返回按钮的时候它会直接返回到用户中心。

Navigator.of(context).pushReplacementNamed('/registerSecond');

Flutter 返回到根路由

比如我们从用户中心跳转到 registerFirst 页面，然后从 registerFirst 页面跳转到 registerSecond 页面，然后从 registerSecond 跳转到了 registerThird 页面。这个时候我们想的是 registerThird 注册成功后返回到用户中心。 这个时候就用到了返回到根路由的方法。

Navigator.of(context).pushAndRemoveUntil(
    new MaterialPageRoute(builder: (context) => new Tabs(index:1)),
);