不重复随机数

版权声明：本文为博主原创文章，转载请注明出处。 https://blog.csdn.net/qq563129582/article/details/83271627

一个随机数的软件，可手动输入最大值，可用于课堂上随机点名，单个学生可随机多次。

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

public class RandomIndex : MonoBehaviour {

    public InputField input;//手动输入最大值
    public Text numText;//显示text

    private int MinNum = 1;//默认最小值
    private int MaxNum = 50;//默认最大值

    private int MaxTimes = 1;//一个数字最多出现次数
    private int random = 0;//当前随机数
	
	void Start () {

	}

    void Update()
    {
        //清空所有记录，重新开始计数
        if (Input.GetKey(KeyCode.C) && Input.GetKey(KeyCode.LeftControl))
        {
            ClearAllData();
            numText.text = "清空数据完毕！";
        }

        //退出程序
        if (Input.GetKeyDown(KeyCode.Escape))
        {
            Application.Quit();
        }
    }

    public void ClearAllData()
    {
        PlayerPrefs.DeleteAll();
        numText.text = "清空数据完毕！";
    }

    public void RandomClick()
    {
        if (input.text != null && input.text != "")
        {
            MaxNum = int.Parse(input.text);
        }

        random = Random.Range(MinNum, MaxNum);
        int randomTimes = 0;
        while (true)
        {
            //防止死循环
            randomTimes++;
            if (randomTimes > 100)
            {
                numText.text = "没有可随机的学生了,请重新开始！";
                break;
            }

            int times = SaveIndex(random);
            if (times > MaxTimes)
            {
                random++;
                if (random >= MaxNum)
                {
                    random = 1;
                }
                continue;
            }
            numText.text = "随机" + random+ "号,第"+ times+"次";
            break;
        }
    }

    int SaveIndex(int num)
    {
        string IdKey = "STUDENT" + num;
        int count = 1;
        if (!PlayerPrefs.HasKey(IdKey))
        {
            PlayerPrefs.SetInt(IdKey, count);
        }
        else
        {
            count = PlayerPrefs.GetInt(IdKey, 1);
            count++;
            PlayerPrefs.SetInt(IdKey, count);
        }
        return count;
    }
}