路由参数问题

命名route的情况下传参给下个页面

一

###传参
Navigator.push(
                  context,
                  MaterialPageRoute(
                    builder: (context) => ExtractArgumentsScreen(),
                    // Pass the arguments as part of the RouteSettings. The
                    // ExtractArgumentScreen reads the arguments from these
                    // settings.
                    settings: RouteSettings(
                      arguments: ScreenArguments(
                        'Extract Arguments Screen',
                        'This message is extracted in the build method.',
                      ),
                    ),
                  ),
                );
###获取值
final ScreenArguments args = ModalRoute.of(context).settings.arguments;

二 MaterialApp中统一处理

//统一设置值到命名route页面
MaterialApp(
      // Provide a function to handle named routes. Use this function to
      // identify the named route being pushed, and create the correct
      // Screen.
      onGenerateRoute: (settings) {
        // If you push the PassArguments route
        if (settings.name == PassArgumentsScreen.routeName) {
          // Cast the arguments to the correct type: ScreenArguments.
          final ScreenArguments args = settings.arguments;
          // Then, extract the required data from the arguments and
          // pass the data to the correct screen.
          return MaterialPageRoute(
            builder: (context) {
              return PassArgumentsScreen(
                title: args.title,
                message: args.message,
              );
            },
          );
        }
      },
      title: 'Navigation with Arguments',
      home: HomeScreen(),
    );
//传值
Navigator.pushNamed(
                  context,
                  PassArgumentsScreen.routeName,
                  arguments: ScreenArguments(
                    'Accept Arguments Screen',
                    'This message is extracted in the onGenerateRoute function.',
                  ),
                );

pod的时候接收返回参数

//传参
Navigator.pop(context, 'Yep!');
//接收回传参数
final result = await Navigator.push(
      context,
      MaterialPageRoute(builder: (context) => SelectionScreen()),
    );
    print('$result');