Unity抽奖轮盘控制器脚本：结果打印方法重复调用问题

问题分析 #

1. 多次打印的原因：大概率是按钮点击监听被重复添加，或者场景中存在多个PrizeWheelController实例，导致每次点击触发多次协程，最终多次调用DetermineAndDisplayPrize。
2. 角度错误的原因：依赖累加的totalRotation计算最终角度，而Unity的localEulerAngles会自动归一化旋转值，导致totalRotation和轮盘实际显示的角度不一致。

修复方案 #

1. 避免重复添加按钮监听 #

将按钮监听的添加/移除逻辑移到OnEnable/OnDisable中，防止重复绑定：

private void OnEnable()
{
    spinButton.onClick.AddListener(SpinWheel);
}

private void OnDisable()
{
    spinButton.onClick.RemoveListener(SpinWheel);
}

同时检查场景中是否有多个挂载了该脚本的物体，确保只保留一个实例。

2. 使用轮盘实际旋转角度判断奖品 #

放弃累加的totalRotation，直接读取轮盘的localEulerAngles.x作为最终角度，保证和视觉上的角度一致：

private void DetermineAndDisplayPrize()
{
    float finalRotation = NormalizeAngle(insideWheel.localEulerAngles.x);
    string prize = DeterminePrize(finalRotation);
    Debug.Log("Final Rotation: " + finalRotation);
    Debug.Log("Prize won: " + prize);
}

3. 优化轮盘停止逻辑 #

修改协程中的循环条件，让轮盘在速度降为0时立即停止，无需等待剩余的spinDuration：

while (spinTime < spinDuration && spinSpeed > 0f)
{
    spinTime += Time.deltaTime;
    spinSpeed = Mathf.Max(spinSpeed - decelerationRate * Time.deltaTime, 0f);
    float rotationStep = spinSpeed * Time.deltaTime;
    totalRotation += rotationStep;
    insideWheel.localEulerAngles = new Vector3(totalRotation, 0f, 0f);
    yield return null;
}

完整修复后的脚本 #

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class PrizeWheelController : MonoBehaviour
{
    public Transform insideWheel;
    public float initialSpinSpeed = 1500.0f;
    public float minSpinDuration = 2.0f;
    public float maxSpinDuration = 5.0f;
    public float decelerationRate = 300.0f;
    public Button spinButton;

    private bool isSpinning = false;
    private bool prizeDetermined = false;
    private float spinSpeed;
    private float totalRotation = 0f;

    private void OnEnable()
    {
        spinButton.onClick.AddListener(SpinWheel);
    }

    private void OnDisable()
    {
        spinButton.onClick.RemoveListener(SpinWheel);
    }

    private IEnumerator SpinWheelRoutine()
    {
        isSpinning = true;
        prizeDetermined = false;
        spinButton.interactable = false;

        float spinDuration = Random.Range(minSpinDuration, maxSpinDuration);
        float spinTime = 0f;
        spinSpeed = initialSpinSpeed;
        totalRotation = 0f;

        while (spinTime < spinDuration && spinSpeed > 0f)
        {
            spinTime += Time.deltaTime;
            spinSpeed = Mathf.Max(spinSpeed - decelerationRate * Time.deltaTime, 0f);
            float rotationStep = spinSpeed * Time.deltaTime;
            totalRotation += rotationStep;
            insideWheel.localEulerAngles = new Vector3(totalRotation, 0f, 0f);
            yield return null;
        }

        yield return new WaitForSeconds(5.0f); // 轮盘停止后等待5秒再显示结果

        if (!prizeDetermined)
        {
            DetermineAndDisplayPrize();
            prizeDetermined = true;
        }

        isSpinning = false;
        spinButton.interactable = true;
    }

    public void SpinWheel()
    {
        if (!isSpinning)
        {
            StartCoroutine(SpinWheelRoutine());
        }
    }

    private void DetermineAndDisplayPrize()
    {
        float finalRotation = NormalizeAngle(insideWheel.localEulerAngles.x);
        string prize = DeterminePrize(finalRotation);
        Debug.Log("Final Rotation: " + finalRotation);
        Debug.Log("Prize won: " + prize);
    }

    private float NormalizeAngle(float angle)
    {
        return (angle % 360 + 360) % 360;
    }

    private string DeterminePrize(float angle)
    {
        if (angle >= 0 && angle <= 45) return "$0";
        if (angle >= 46 && angle <= 90) return "$1000";
        if (angle >= 91 && angle <= 135) return "$600";
        if (angle >= 136 && angle <= 180) return "$400";
        if (angle >= 181 && angle <= 225) return "3x";
        if (angle >= 226 && angle <= 270) return "$800";
        if (angle >= 271 && angle <= 315) return "$200";
        if (angle >= 316 && angle < 360) return "2x";

        return "Unknown Prize";
    }
}

内容的提问来源于stack exchange，提问作者thegu