unity-----異步場景加載進度條的制作

1. 準備兩個場景
2. 第一個場景制作一個button,之後添加panel,slider,text,将panel設定為隐藏

3. 

4. 設定一個空物體，命名為loadmanager
5. 為loadmanager添加腳本，代碼如下

   using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   using UnityEngine.UI;
   using UnityEngine.SceneManagement;
       /// <summary>
       /// 
       /// </summary>
   
   public class LoadManager : MonoBehaviour
   {
       public GameObject loadScreen;
       public Slider slider;
       public Text text;
       public void LoadNextLevel()
       {
           StartCoroutine(Loadlevel());
       }
   
       IEnumerator Loadlevel()
       {
           loadScreen.SetActive(true);
   
           AsyncOperation operation = SceneManager.LoadSceneAsync(SceneManager.GetActiveScene().buildIndex + 1);
   
           operation.allowSceneActivation = false;//控制不自動跳轉到加載好的場景，progress值停在0.9
   
           while (!operation.isDone)
           {
               slider.value = operation.progress;//将加載進度傳輸給Slider的滑動條
   
               text.text = operation.progress * 100 + "%";//文本顯示百分比
   
               if (operation.progress >= 0.9f)//判斷是否場景已經在背景準備好
               {
                   slider.value = 1;//強行調整到100%的進度條
   
                   text.text = "Press AnyKey to continue";
   
                   if (Input.anyKeyDown)
                   {
                       operation.allowSceneActivation = true;//完成最後10%的工作，顯示加載好的場景
                   }
               }
               yield return null;
           }
       }
   }
              

6. 

7. 點選file——building settings ,添加兩個需要用到的場景
8. 點選button,在inspector面闆中點選onclick,為按鈕添加點選事件，将loadmanager拖入，并且選擇我們剛剛寫的方法