Flutter Navigator路由传参

时间:2022-06-03 WEB前端李志杰人气:0

Flutter中的默认导航分成两种，一种是命名的路由，一种是构建路由。

一、命名路由传参

应用入口处定义路由表

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false, // 隐藏预览中的debug
      title: 'Flutter Demo',
      routes: {
        '/': (context) => const HomePage(),
        "menu": (context) => const MenuPage()
      },
    );
  }
}

// 定义HomePage
class HomePage extends StatelessWidget {
  const HomePage({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("登录"),
      ),
      body: ElevatedButton(
        onPressed: () async {
          // 实现路由跳转
          var result = await Navigator.pushNamed(context, 'menu',
              arguments: {'name': 'title'});
          print(result);
        },
        child: const Text('登录'),
      ),
    );
  }
}

// 定义MenuPage
class MenuPage extends StatelessWidget {
  const MenuPage({Key? key}) : super(key: key);
  @override
  // 接收传参
  Widget build(BuildContext context) {
    dynamic argumentsData = ModalRoute.of(context)?.settings.arguments;
    return Scaffold(
      appBar: AppBar(
        title: Text('菜单' + argumentsData.toString()),
      ),
      body: ElevatedButton(
        onPressed: () {
          Navigator.pop(context, {'name': "Navigator.pop传参"});
        },
        child: const Text("返回"),
      ),
    );
  }
}

二、构建路由传参

从HomePage页面跳转MenuPage页面时，携带参数

第一种方式：

// 定义HomePage
class HomePage extends StatelessWidget {
  const HomePage ({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("登录"),
      ),
      body: ElevatedButton(
        onPressed: () {
          // 实现路由跳转
          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => const MenuPage(
                title: '菜单123',
              ), // 需要跳转的页面
            ), // 修改路由的名称、信息等
          );
        },
        child: const Text('登录'),
      ),
    );
  }
}

// 定义MenuPage
class MenuPage extends StatelessWidget {
  // 定义接收的字段
  final String title;
  const MenuPage({Key? key, required this.title}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: ElevatedButton(
        onPressed: () {
          Navigator.pop(context);
        },
        child: const Text("返回"),
      ),
    );
  }
}

第二种方式：

// 定义HomePage
class HomePage extends StatelessWidget {
  const HomePage({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("登录"),
      ),
      body: ElevatedButton(
        onPressed: () {
          // 实现路由跳转
          Navigator.push(
            context,
            MaterialPageRoute(
                builder: (context) => const MenuPage(),
                // 修改路由的名称、信息等
                settings: const RouteSettings(
                    name: '菜单', arguments: {"name": '123'}) // 需要跳转的页面
                ),
          );
        },
        child: const Text('登录'),
      ),
    );
  }
}

// 定义MenuPage
class MenuPage extends StatelessWidget {
  const MenuPage({Key? key}) : super(key: key);
  @override
  // 接收传参
  Widget build(BuildContext context) {
    dynamic argumentsData = ModalRoute.of(context)?.settings.arguments;
    return Scaffold(
      appBar: AppBar(
        title: Text('菜单' + argumentsData.toString()),
      ),
      body: ElevatedButton(
        onPressed: () {
          Navigator.pop(context);
        },
        child: const Text("返回"),
      ),
    );
  }
}

从MenuPage页面返回HomePage页面时，携带参数

// 定义HomePage
class HomePage extends StatelessWidget {
  const HomePage ({Key? key}) : super(key: key);;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("登录"),
      ),
      body: ElevatedButton(
        onPressed: () async {
          // 实现路由跳转
          var result = await Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => const MenuPage(),
            ),
          );
          print(result);
        },
        child: const Text('登录'),
      ),
    );
  }
}

// 定义MenuPage
class MenuPage extends StatelessWidget {
  const MenuPage({Key? key}) : super(key: key);
  @override
  // 接收传参
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('菜单'),
      ),
      body: ElevatedButton(
        onPressed: () {
          Navigator.pop(context, {'name': "Navigator.pop传参"});
        },
        child: const Text("返回"),
      ),
    );
  }
}

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