Unity脚本仅填充前两个答案文本，后两个无响应求助

问题描述 #

我编写了一段Unity脚本，功能为随机抽取问题并随机分配对应答案，但当前脚本仅能填充前两个答案的TextMeshProUGUI文本，后两个答案无内容。四个答案的填充逻辑代码完全一致，现请求排查问题原因。

原脚本代码 #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
using TMPro;

public class QuestionData : MonoBehaviour
{
    public Quistions questions;
    public Awnser answers;
    [SerializeField] private TextMeshProUGUI _questionText;
    [SerializeField] private TextMeshProUGUI Awn1Text;
    [SerializeField] private TextMeshProUGUI Awn2Text;
    [SerializeField] private TextMeshProUGUI Awn3Text;
    [SerializeField] private TextMeshProUGUI Awn4Text;
    private int Aw1;
    private int Aw2;
    private int Aw3;
    private int Aw4;

    void Start()
    {
        AskQuestion();
    }

    public void AskQuestion()
    {
        if (CountValidQuestions() == 0)
        {
            _questionText.text = string.Empty;
            ClearQuestions();
            SceneManager.LoadScene("EndScreen");
            return;
        }

        int randomIndex;
        int QNum;
        int Aw1 = -1;
        int Aw2 = -1; // Initialize Aw2
        int Aw3 = -1; // Initialize Aw3
        int Aw4;

        do
        {
            randomIndex = UnityEngine.Random.Range(0, questions.questionList.Count);
            QNum = UnityEngine.Random.Range(0, 4);
        } while (questions.questionList[randomIndex].questioned);

        questions.questionList[randomIndex].questioned = true;
        _questionText.text = questions.questionList[randomIndex].question;

        for (int i = 1; i <= 4; i++)
        {
            int randomAnswerIndex;

            do
            {
                randomAnswerIndex = UnityEngine.Random.Range(0, 4);
            } while (randomAnswerIndex == Aw1 || randomAnswerIndex == Aw2 || randomAnswerIndex == Aw3);

            int currentAnswerIndex = (randomIndex * 4) + randomAnswerIndex;

            foreach (var answerData in answers.awnserList)
            {
                Debug.Log("Answer: " + answerData.awnser + ", IsAwn: " + answerData.IsAwn);
            }

            switch (i)
            {
                case 1:
                    Awn1Text.text = answers.awnserList[currentAnswerIndex].awnser;
                    Aw1 = randomAnswerIndex;
                    Debug.Log("Aw1: " + Aw1);
                    break;
                case 2:
                    Awn2Text.text = answers.awnserList[currentAnswerIndex].awnser;
                    Aw2 = randomAnswerIndex;
                    Debug.Log("Aw2: " + Aw2);
                    break;
                case 3:
                    Awn3Text.text = answers.awnserList[currentAnswerIndex].awnser;
                    Aw3 = randomAnswerIndex;
                    Debug.Log("Aw3: " + Aw3);
                    break;
                case 4:
                    Awn4Text.text = answers.awnserList[currentAnswerIndex].awnser;
                    Aw4 = randomAnswerIndex;
                    Debug.Log("Aw4: " + Aw4);
                    break;
            }
        }
    }


    public void ClearQuestions()
    {
        foreach (var question in questions.questionList)
        {
            question.questioned = false;
        }
    }

    private int CountValidQuestions()
    {
        int ValidQuestions = 0;
        foreach (var question in questions.questionList)
        {
            if (!question.questioned)
            {
                ValidQuestions++;
            }
        }
        Debug.Log("Questions Left: " + ValidQuestions);
        return ValidQuestions;
    }
}

注：已知“Question”和“answer”拼写错误，暂未修改。

问题排查与修复方案 #

1. 优先检查组件绑定（最常见原因） #

• 打开Unity编辑器，找到挂载该脚本的游戏物体
• 在Inspector面板中，确认Awn3Text和Awn4Text字段已拖拽绑定对应的TextMeshProUGUI组件，未留空
• 如果未绑定，拖拽对应组件到字段后运行测试

2. 修复随机索引逻辑的隐患 #

当前第4次循环时，随机生成索引可能多次尝试才命中剩余值，且存在逻辑冗余，可优化为直接获取未使用的索引，避免无效循环：

// 替换原for循环内的do-while代码块
List<int> usedIndices = new List<int>();
if (Aw1 != -1) usedIndices.Add(Aw1);
if (Aw2 != -1) usedIndices.Add(Aw2);
if (Aw3 != -1) usedIndices.Add(Aw3);

int randomAnswerIndex = -1;
for (int j = 0; j < 4; j++)
{
    if (!usedIndices.Contains(j))
    {
        randomAnswerIndex = j;
        break;
    }
}

3. 检查答案列表长度是否匹配 #

• 确认answers.awnserList的长度等于questions.questionList.Count × 4，每个问题对应4个答案
• 查看Unity控制台是否有IndexOutOfRangeException报错，若有则补充答案列表内容

4. 清理冗余变量 #

类成员变量Aw1、Aw2、Aw3、Aw4未在方法外使用，且被方法内的局部变量覆盖，可删除这些成员变量，简化代码结构

修复后示例代码（关键部分优化） #

public void AskQuestion()
{
    if (CountValidQuestions() == 0)
    {
        _questionText.text = string.Empty;
        ClearQuestions();
        SceneManager.LoadScene("EndScreen");
        return;
    }

    int randomIndex;
    do
    {
        randomIndex = UnityEngine.Random.Range(0, questions.questionList.Count);
    } while (questions.questionList[randomIndex].questioned);

    questions.questionList[randomIndex].questioned = true;
    _questionText.text = questions.questionList[randomIndex].question;

    int usedAw1 = -1;
    int usedAw2 = -1;
    int usedAw3 = -1;

    for (int i = 1; i <= 4; i++)
    {
        int randomAnswerIndex = -1;
        List<int> usedIndices = new List<int>();
        if (usedAw1 != -1) usedIndices.Add(usedAw1);
        if (usedAw2 != -1) usedIndices.Add(usedAw2);
        if (usedAw3 != -1) usedIndices.Add(usedAw3);

        for (int j = 0; j < 4; j++)
        {
            if (!usedIndices.Contains(j))
            {
                randomAnswerIndex = j;
                break;
            }
        }

        int currentAnswerIndex = (randomIndex * 4) + randomAnswerIndex;

        switch (i)
        {
            case 1:
                Awn1Text.text = answers.awnserList[currentAnswerIndex].awnser;
                usedAw1 = randomAnswerIndex;
                Debug.Log("Aw1: " + usedAw1);
                break;
            case 2:
                Awn2Text.text = answers.awnserList[currentAnswerIndex].awnser;
                usedAw2 = randomAnswerIndex;
                Debug.Log("Aw2: " + usedAw2);
                break;
            case 3:
                Awn3Text.text = answers.awnserList[currentAnswerIndex].awnser;
                usedAw3 = randomAnswerIndex;
                Debug.Log("Aw3: " + usedAw3);
                break;
            case 4:
                Awn4Text.text = answers.awnserList[currentAnswerIndex].awnser;
                Debug.Log("Aw4: " + randomAnswerIndex);
                break;
        }
    }
}

内容的提问来源于stack exchange，提问作者Ezx