这段时间工作比较空闲，想做个抽奖系统，发现网上的抽奖系统看不懂，然后自己做了一个可以随意定义奖品概率，不管什么时候停下来指针最终都会转到指定的奖品哪。

废话不多说，动手一步一步来。

这个抽奖系统就使用了两张图片，一个指针，一个圆形的图片。

然后做一个预制体，图片就是圆形图片，image type选择filled,fill amount控制这个图片的面积大小，同时也是该图片的概率，Text组件是该奖品的名称。

再接下来就做一下界面布局的工作

Bg就是那个灰色的图片，Rotate是个空物体，用来挂在脚本的（DialRotate.cs和Slot.cs），cloneParent也是个空物体，作为预制体的父物体，要注意的是cloneParent中心那个蓝色的圆圈要和Rotate的蓝色的圈的位置一致，界面布局工作完成。

接下来到代码了，Slot.cs脚本，一开始会实例化奖品，K键和L键可以随意修改奖品名称，概率（这里概率做了限制，需要使用的自己修改一下代码即可），空格键会随机抛出物品，并且开始旋转，鼠标右键是停止转动（想什么时候停下来都行，最后都会得到所抛出的物体）DialRotate.cs脚本用于处理旋转的。这两个脚本涉及到一些数学计算，慢慢理解即可。

以下是这个工程的脚本，需要的话直接复制黏贴即可使用

Slot.cs

using System.Collections.Generic;using UnityEngine;using UnityEngine.UI; public class Slot : MonoBehaviour { private DialRotate dialRotate; /// <summary> /// 奖品数据 /// </summary> private class GrifData { /// <summary> /// 奖品的名称 /// </summary> public string mText; /// <summary> /// 图片的Amount值 /// </summary> public float point; /// <summary> /// 奖品停留在指针时父物体要旋转的角度 /// </summary> public float angle; /// <summary> /// 该奖品对应UI面板上的名称 /// </summary> public string mtran; /// <summary> /// 该奖品的ID /// </summary> public int gID; } /// <summary> /// 奖品的描述信息 /// </summary> private class GrifInfo { public Text mText; public string msg; } private List<GrifInfo> mListSD = new List<GrifInfo>(); /// <summary> /// 奖品的id和概率对应 /// </summary> private Dictionary<int, float> mPoints = new Dictionary<int, float>(); /// <summary> /// 用于储存奖品信息（顺序排列）（奖品的id，名称，所占的百分比） /// </summary> private List<GrifData> grigtData = new List<GrifData>(); /// <summary> /// 这个也是用于储存奖品信息，不过是乱序排列（奖品的id，名称，所占的百分比） /// </summary> private List<GrifData> randomData = new List<GrifData>(); /// <summary> /// 20种奖品的Transform，（最多20个不用的奖励） /// </summary> private List<Transform> mTransLs = new List<Transform>(); private List<Color> mColors = new List<Color>(); private Transform cloneParent; private GameObject clonePrefab; /// <summary> /// 抽奖停止时父物体转动的角度 /// </summary> public float tarAngle; /// <summary> /// 该奖品对应UI面板上的名称 /// </summary> public string tarName; public int giftID; /// <summary> /// 用于检验概率有没有为100% /// </summary> private List<float> checkProbability = new List<float>(); private void Start() { cloneParent = transform.Find("cloneParent"); clonePrefab = Resources.Load<GameObject>("Clone"); dialRotate = GetComponent<DialRotate>(); Init(); } void Update() { #region 测试修改奖品，概率 if (Input.GetKeyDown(KeyCode.K)) { ClearData(); if (checkProbability.Count > 0) { checkProbability.Clear(); } if (mPoints.Count > 0) { mPoints.Clear(); } AddData("111", 0.3f,1); AddData("222", 0.1f,2); AddData("333", 0.2f,4); AddData("444", 0.05f,5); AddData("555", 0.15f,6); AddData("666", 0.2f,7); SetPriceRange(); } if (Input.GetKeyDown(KeyCode.J)) { ClearData(); if (checkProbability.Count > 0) { checkProbability.Clear(); } if (mPoints.Count > 0) { mPoints.Clear(); } AddData("薯条", 0.3f, 1); AddData("汉堡", 0.1f, 2); AddData("炸鸡", 0.2f, 4); AddData("啤酒", 0.05f, 5); AddData("可乐", 0.15f, 6); AddData("烤肉", 0.2f, 7); SetPriceRange(); } #endregion if (Input.GetKeyDown(KeyCode.Space)) { StartRotate(); } } private void Init() { for (int i = 0; i < 20; i++) { GameObject go = Instantiate(clonePrefab) as GameObject; go.transform.SetParent(cloneParent); go.transform.localScale = Vector3.one; go.transform.localPosition = Vector3.zero; go.name = "" + i; mTransLs.Add(go.transform); } foreach (Transform tr in mTransLs) { tr.GetComponent<Image>().color = GetColors(); tr.gameObject.SetActive(false); } AddData("薯条", 0.3f, 1); AddData("汉堡", 0.1f, 2); AddData("炸鸡", 0.2f, 4); AddData("啤酒", 0.05f, 5); AddData("可乐", 0.15f, 6); AddData("烤肉", 0.2f, 7); SetPriceRange(); } /// <summary> /// 获得随机颜色 /// </summary> /// <returns></returns> private Color GetColors() { return new Color(Random.Range(0, 1.0f), Random.Range(0, 1.0f), Random.Range(0, 1.0f)); } /// <summary> /// 清除奖品的相关数据和设置新的颜色 /// </summary> public void ClearData() { grigtData.Clear(); foreach (Transform tr in mTransLs) { tr.GetComponent<Image>().color = GetColors(); tr.gameObject.SetActive(false); } } /// <summary> /// 设置奖励信息 /// </summary> /// <param name="text">名称</param> /// <param name="point">所占的百分比</param> /// <param name="gID">该奖品的ID</param> public void AddData(string text, float point, int gID) { if (point < 0.05f) { Debug.LogError("奖品的概率不能小于5%"); } if (point >1.0f) { Debug.LogError("奖品的概率不能大于100%"); } GrifData data = new GrifData(); data.mText = text; data.point = point; data.gID = gID; grigtData.Add(data); if (mPoints.ContainsKey(gID)) { // mPoints[gID] = point; Debug.LogError("物品的ID不能一致，无法添加到字典"); return; } mPoints.Add(gID, point); checkProbability.Add(point); } /// <summary> /// 设置奖品转盘的面积的大小显示 /// </summary> public void SetPriceRange() { float total = 0; for (int i = 0; i < checkProbability.Count; i++) { total += checkProbability[i]; } if (total.ToString() !="1") { Debug.LogError("奖品的概率总和不等于百分百，请从新设定概率"); return; } transform.localEulerAngles = Vector3.zero; // List<SData> temDate = mData.OrderBy(mData => mData.point).ToList(); //升序排序 //乱序排列 randomData.Clear(); int count = grigtData.Count; //所设置的奖品的个数 for (int i = 0; i < count; i++) { int ra = Random.Range(0, grigtData.Count); randomData.Add(grigtData[ra]); grigtData.RemoveAt(ra); } if (mListSD.Count > 0) { mListSD.Clear(); //先清空 } float nowAmount = 0; Text text; for (int i = 0; i < count; i++) //把设置了奖品的显示出来 { Transform tr = mTransLs[i]; tr.gameObject.SetActive(true); // Debug.Log(ramData[i].mText + "/n"); //因为绘制奖励区域是从转盘的下面6点顺时针方向开始绘制，而指针是在上面9点，转盘是顺时针转动，加多180度， //ramData[i].point/2 使得转盘停下来时使得奖品刚好处于指针的中间 float target = 180 + (nowAmount + randomData[i].point/2) * 360; if (target > 360) target -= 360; text = tr.Find("Text").GetComponent<Text>(); text.text = randomData[i].mText; GrifInfo grifInfo = new GrifInfo(); //暂时预留，发奖品不是单倍的时候有用 grifInfo.mText = text; //暂时预留，发奖品不是单倍的时候有用 grifInfo.msg = randomData[i].mText; //暂时预留，发奖品不是单倍的时候有用 mListSD.Add(grifInfo); //暂时预留，发奖品不是单倍的时候有用 tr.GetComponent<Image>().fillAmount = randomData[i].point; //这个是旋转所设置的奖品的角度 tr.localEulerAngles = new Vector3(0, 0, -nowAmount * 360); //0.1Amount = 36度 nowAmount += randomData[i].point; // Debug.Log(" i = " + i + "target = " + target); randomData[i].angle = target; randomData[i].mtran = tr.name; // Debug.Log("target = " + target); } } /// <summary> /// 设置奖品的倍数 /// </summary> /// <param name="multiple"></param> public void SetMultiple(int multiple) { foreach (GrifInfo ss in mListSD) { if (multiple == 1) { ss.mText.text = ss.msg; } else { ss.mText.text = ss.msg + " X" + multiple; } } } /// <summary> /// 获得结果（得到概率） /// </summary> public void GetResult() { float probability = Random.Range(0.0f, 1.0f); float nowSub = 0; string testStr = ""; for (int i = 0; i < randomData.Count; i++) { nowSub += mPoints[randomData[i].gID]; //该奖品对应的概率(Amount值) if (probability < nowSub) { tarAngle = randomData[i].angle; //该奖品停止转动时需要转动的角度 tarName = randomData[i].mtran; //该奖品的名称 giftID = randomData[i].gID; //ID testStr ="奖品名称 = " + randomData[i].mText + " 奖品概率 = " + (mPoints[randomData[i].gID] * 100 + " UI上的名称 = " + tarName + " 奖品的ID = " + giftID); Debug.Log(testStr); break; } } } private void StartRotate() { GetResult(); dialRotate.StartQuan(tarAngle, tarName); Debug.Log("StartRotate() : tarAngle = " + tarAngle); }}

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DialRotate.cs

using UnityEngine;public enum RollType{ None, Start, //开始转动 ConstantSpeed, //匀速运动 Stop, //停止运动}public class DialRotate : MonoBehaviour { private RollType nowType = RollType.None; private float tarAngle; //该奖品停下来时父物体Z轴需要转动的角度 /// <summary> /// 当前Z轴的值 /// </summary> private float nowAngle = 0; private string grifName; private float time;//计时器 private float speed = 0; public float angleSpeed = 2; void Update () { if (Input.GetMouseButtonDown(1)) { if (nowType == RollType.ConstantSpeed) { nowType = RollType.Stop; // Debug.Log("tarAngle = " + tarAngle + " nowAngle = " + nowAngle); tarAngle += nowAngle + 360; time = 0; } } if (nowType == RollType.Start) { time += Time.deltaTime; float x = angleSpeed * time * time; //这些数值影响转盘的转动速度，自己看着喜欢调节即可 nowAngle -= x; speed += 4 * time; transform.localEulerAngles = new Vector3(0, 0, nowAngle); if (speed > 400) { nowType = RollType.ConstantSpeed; } } else if (nowType == RollType.ConstantSpeed) { nowAngle -= speed * Time.deltaTime; //匀速旋转 transform.localEulerAngles = new Vector3(0, 0, nowAngle); } else if (nowType == RollType.Stop) { //速度慢慢变小,转盘慢慢的慢下来 speed = Mathf.Lerp(speed, Mathf.Min(speed, tarAngle * 0.25f), Time.deltaTime); // Debug.Log("speed = " + speed); if (speed < 5) { speed = 5; } float angle = speed * Time.deltaTime; tarAngle -= angle; nowAngle -= angle; if (tarAngle < 0) { Debug.Log("转盘停止转动"); nowType = RollType.None; } else { transform.localEulerAngles = new Vector3(0, 0, nowAngle); } } if (nowAngle < -360) { nowAngle += 360; } } public void StartQuan(float tarAngle, string giftName) { if (nowType != RollType.None) { return; } grifName = giftName; this.tarAngle = 360 * 2 - tarAngle; nowType = RollType.Start; time = 0; nowAngle = transform.localEulerAngles.z; speed = 0; }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。