实现效果如下：

实现效果为：外部传入数值，正常显示 老虎机抽取效果

用户可自定义行为：1，抽取的显示；2，抽取的最低时间

实现代码如下，可自行改写：

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

/// <summary>
/// 老虎机
/// </summary>
public class SlotMachine : MonoBehaviour
{
    //private float startPosY;

    private int[] moveAdd = new int[3] { 0, 0, 0 };


    private bool[] playArray = new bool[3] { false, false, false };

    private int[] showArray = new int[3] { 0, 1, 2 };

    public float MinTime = 3f;
    private float minTime = 0f;

    private float moveFx = 0.2f;//移动系数，需要能被1整除:0.1;0.2;0.25;0.5
    private float moveLen;
    private int moveNum = 5;

    private Action callBackAc;    

    //public float UpdateSp = 0.05f;

    / <summary>
    / 传入类型
    / </summary>
    //public void Born()
    //{
     
    //    var _messT = transform.Find("1").GetChild(1);
    //    moveLen = _messT.GetComponent<RectTransform>().rect.height * moveFx;

    //    Debug.LogError(moveNum + "  " + moveLen + "   " + (1 / moveFx) + "   "/*+startPosY*/);

    //}

    public void ClickPlay(int _one, int _two, int _three,Action _callAc)
    {
        playArray[0] = true;
        playArray[1] = true;
        playArray[2] = true;
        showArray[0] = _one;
        showArray[1] = _two;
        showArray[2] = _three;
        minTime = MinTime + Time.time;
        callBackAc = null;
        callBackAc = _callAc;            
    }

    // Start is called before the first frame update
    void Start()
    {
        //Born();
        var _messT = transform.Find("1").GetChild(1);
        moveLen = _messT.GetComponent<RectTransform>().rect.height * moveFx;

    }

    //private float updateTime = 0f;

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.A)) ClickPlay(1, 2, 2,delegate { Debug.Log("打印"); });

        for (var _i = 0; _i < 3; _i++)
        {
            if (playArray[_i])
            {
                string _name = "";
                bool _isUpdate = UpdateDown(_i, out _name);
                if (Time.time > minTime && _isUpdate && _name == showArray[_i].ToString())
                {
                    switch (_i)
                    {
                        case 0: playArray[_i] = false; break;
                        case 1: if (!playArray[0]) playArray[_i] = false; break;
                        case 2: if (!playArray[1] && playArray[_i]) { playArray[_i] = false;/* Debug.LogError("执行");*/ callBackAc?.Invoke(); } break;
                    }
                    //Debug.Log(_name + " ~~~~~~~  " + _i);
                }
            }
        }
    }


    /// <summary>
    /// 模拟不断下落的过程
    /// </summary>
    private bool UpdateDown(int _i, out string _imageName)
    {
        var _tran = transform.Find(_i.ToString());
        _imageName = "";

        var _down = moveLen * Vector3.down;
        foreach (Transform idx in _tran)
            idx.GetComponent<RectTransform>().localPosition += _down;

        moveAdd[_i] += 1;
        //Debug.Log(moveAdd[_i] + "  " + moveNum);

        var _isR = moveAdd[_i] == moveNum;
        if (_isR)
        {
            _tran.GetChild(_tran.childCount - 1).SetSiblingIndex(0);         
            _imageName = _tran.GetChild(2).name;
            //Debug.Log(_i + "   " + _imageName);
        }
        _tran.GetComponent<ContentSizeFitter>().enabled = _isR;
        _tran.GetComponent<VerticalLayoutGroup>().enabled = _isR;
        if (_isR) moveAdd[_i] = 0;
        return _isR;
    }


}