Unity UGUI暂停按钮切换图片代码

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

 public class PauseContorl : MonoBehaviour
 {
     bool isGamePause;
     //游戏暂停按钮
     private GameObject pauseButtonObj;
     //当前暂停按钮的图片
     private Image currentPauseImage;
     //暂停按钮Sprite
     private Sprite pauseSprite;
     //开始按钮Sprite
     private Sprite startSprite;

     private void Start()
     {
         pauseButtonObj = GameObject.Find("PauseButton");
         pauseButtonObj.GetComponent<Button>().onClick.AddListener
          (
             delegate () { SetPause(); }
          );

         currentPauseImage = pauseButtonObj.GetComponent<Image>();

         pauseSprite = Resources.Load("Images/pause/pause", typeof(Sprite)) as Sprite;
         startSprite = Resources.Load("Images/pause/start", typeof(Sprite)) as Sprite;
     }

     //设置游戏是否暂停
     void SetPause()
     {
         if (isGamePause)
         {
             isGamePause = false;

             currentPauseImage.sprite = pauseSprite;
         }
         else
         {
             isGamePause = true;

             currentPauseImage.sprite = startSprite;
         }
     }
 }