Unity异步加载场景

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

public class LoadScene : MonoBehaviour
{
    private AsyncOperation async;
    public Slider slider;
    public Text text;
    public Text CurLevel;

    void Start()
    {
        CurLevel.text = PlayerPrefs.GetInt("CurLevel", 1).ToString();
        StartCoroutine("Load");
    }

    IEnumerator Load()
    {
        //异步加载场景
        async = SceneManager.LoadSceneAsync("GameScene");
        //不允许自动加载场景
        async.allowSceneActivation = false;
       
        while (!async.isDone && async.progress < 0.8f)
        {
            yield return async;
        }
    }

    void Update()
    {
        if (async.progress < 0.8f)
        {
            slider.value = async.progress;
        }
        else
        {
            slider.value = 1;
            async.allowSceneActivation = true;
        }

        text.text = (slider.value * 100).ToString("0") + "%";
    }
}

  async.progress值达到0.8时就已经记载完成了。