Unity 异步加载场景进度条

using UnityEngine.SceneManagement;   //使用场景管理空间

AsyncOperation prog   =  SceneManager.LoadSceneAsync("场景");     //新的异步加载场景API，返回异步参数 AsyncOperation.progress   // 获取进度（我测试了一下最大是0.9，可能要真正跳到场景才是1） AsyncOperation.allowSceneActivation // //如果加载完成，是否立刻进入场景

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
 
public class Load : MonoBehaviour {
 
    public Slider progressUI;
    public Text  progressValue;
    private AsyncOperation prog;
 
 
    void Start() {
        prog = SceneManager.LoadSceneAsync("场景名");  //异步加载场景
        
        StartCoroutine(LoadingScene());                 
    }
    
    //设置滑动条
    private void setProgressValue(int value) {
        progressUI.value = value;
        progressValue.text = value + "%";
    }
 
 
    private IEnumerator LoadingScene() 
    {
        prog.allowSceneActivation = false;  //如果加载完成，也不进入场景
 
        int toProgress = 0;         
        int showProgress = 0;
 
        //测试了一下，进度最大就是0.9
        while (prog.progress < 0.9f) 
        {
            toProgress = (int)(prog.progress * 100);
 
            while ( showProgress