[移动开发]Flutter路由传参

1、普通路由

//main.dart
routes: routes,

// 路由跳转
onTap: () {
  // 跳转到任务详情页
  Navigator.of(context).pushNamed('taskDetail',
      arguments:listViewData[index]);
},

// 接收参数，在Widget中
Text(ModalRoute.of(context).settings.arguments.toString();)

2、路由拦截onGenerateRoute

我想把传过来的参数，放在initState中，初始化一个变量，再以变量为参数发送请求获得数据

  void initState() {
    super.initState();
    _taskTrunk = ModalRoute.of(context).settings.arguments;//报错，不知是何原因？
  }

查了下网上的同学们提供的方法onGenerateRoute

   // main.dart路由
   initialRoute: '/',
   // routes: routes,//普通路由时定义的
   onGenerateRoute: onGenerateRoute,

// route.dart
//配置路由
import 'package:AGV/view/login_view.dart';
import 'package:AGV/view/mainPage_view.dart';
import 'package:AGV/view/task/taskDetail_view.dart';
import 'package:flutter/material.dart';
import 'package:AGV/view/task/taskAdd_view.dart';

final routes = {
  "/": (context, {arguments}) => MainPageView(),
  "login": (context, {arguments}) => LoginView(),
  "taskAdd": (context, {arguments}) => TaskAddView(),
  "taskDetail": (context, {arguments}) => TaskDetailView(arguments: arguments),
};

// 处理参数传递
// ignore: top_level_function_literal_block
var onGenerateRoute = (RouteSettings settings) {
  // 获取声明的路由页面函数
  // var pageBuilder = routes[settings.name];
  final Function pageBuilder = routes[settings.name];
  print('********************************');
  if (pageBuilder != null) {
    if (settings.arguments != null) {
      // print(settings.arguments);
      final Route route = MaterialPageRoute(
        builder: (context) {
          //将RouteSettings中的arguments参数取出来，通过构造函数传入
          return pageBuilder(context, arguments: settings.arguments);
        },
        settings: settings,
      );
      return route;
    } else {
      return MaterialPageRoute(builder: (context) => pageBuilder(context));
    }
  }
  return MaterialPageRoute(builder: (context) => MainPageView());
};

// 路由跳转
onTap: () {
  // 跳转到任务详情页
  Navigator.of(context).pushNamed('taskDetail',
      arguments: {'taskData': listViewData[index]});
},

// 接收参数
class TaskDetailView extends StatefulWidget {
  TaskDetailView({Key key, this.arguments}) : super(key: key);
  final Map arguments;
  @override
  _TaskDetailViewState createState() => _TaskDetailViewState();
}

class _TaskDetailViewState extends State<TaskDetailView> {
  TaskTrunk _taskTrunk;
  void initState() {
    super.initState();
    _taskTrunk = widget.arguments['taskData'];
  }