Debugging I'；我是颤振的初学者，如何修复此代码？

我在这里得到随机数，用于我的加法、减法、乘法问题

    import 'dart:math';

import 'package:dart_random_choice/dart_random_choice.dart';
import 'package:flutter/material.dart';

gameWin告诉玩家是否通过了数学考试，是否可以进入下一关

Map questions = {
  "Addition": AdditionWidget(
    num1: num1,
    num2: num2,
  ),
  "Subtraction": SubtractionWidget(
    num1: num1,
    num2: num2,
  ),
  "Multiplication": MultiplicationWidget(
    num1: num1,
    num2: num2,
  )
};

  @override
  void initState() {
    super.initState();
  }

  Widget build(BuildContext context) {
    initializeGame();

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Math Rush'),
        ),
        body: Center(
          child: Row(
            children: <Widget>[
              question,
              Flexible(
                child: TextField(
                  controller: answerController,
                  onChanged: (text) {
                    switch (question) {
                      case 'Addition':
                        {
                          if (num1 + num2 == int.parse(text)) {
                            gameWin = true;
                            checkAnswerIsCorrect();
                          }
                        }
                        break;

                        case 'Subtraction':
                        {
                          if (num1 - num2 == int.parse(text)) {
                            gameWin = true;

初始化游戏是一个函数，每当新游戏开始并选择 随机数学方程

bool gameWin = false;

TextEditingController answerController;

---

不清楚你有什么问题。你的标题需要更清楚。请在顶部告诉我们您看到了什么错误。顺便说一句，您没有正确使用

Random

。您应该实例化一个随机数生成器并重复从中获取随机数，而不是实例化多个随机数生成器。只能在@TommieC处进行第二次实例化。标题应该被编辑。但随机性不应该是他的主要问题；-）

initializeGame() {
  String typeOfQuestion = randomChoice(typeOfQuestions);

  switch (typeOfQuestion) {
    case 'Addition':
      {
        question = questions['Addition'];
      }
      break;
    case 'Subtraction':
      {
        question = questions['Subtraction'];
      }
      break;
    case 'Multiplication':
      {
        question = questions['Addition'];
      }
      break;
    default:
      {
        question = questions['Subtraction'];
      }
      break;
  }
}

class Game extends StatefulWidget {
  _GameState createState() => _GameState();
}

class _GameState extends State<Game> {

  @override
  void initState() {
    super.initState();
  }

  Widget build(BuildContext context) {
    initializeGame();

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Math Rush'),
        ),
        body: Center(
          child: Row(
            children: <Widget>[
              question,
              Flexible(
                child: TextField(
                  controller: answerController,
                  onChanged: (text) {
                    switch (question) {
                      case 'Addition':
                        {
                          if (num1 + num2 == int.parse(text)) {
                            gameWin = true;
                            checkAnswerIsCorrect();
                          }
                        }
                        break;

                        case 'Subtraction':
                        {
                          if (num1 - num2 == int.parse(text)) {
                            gameWin = true;

                            checkAnswerIsCorrect();
                          }
                        }
                        break;
                        case 'Multiplication':
                        {
                          if (num1 * num2 == int.parse(text)) {
                            gameWin = true;
                            checkAnswerIsCorrect();
                          }
                        }
                    }
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  checkAnswerIsCorrect() {
    setState(
      () {
        if (gameWin == true) {
          num1 = Random().nextInt(100);
          num2 = Random().nextInt(100);
          initializeGame();
        }
      },
    );
  }
}