unity——异步加载场景

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

public class LoadSceneSlider : MonoBehaviour
{
    public Slider slider;           //滑动条
    int currentProgress;            //当前进度
    int targetProgress;             //目标进度
    public TextMeshProUGUI text;    //进度文字

    private void Start()
    {
        currentProgress = 0;
        targetProgress = 0;
        StartCoroutine(LoadingScene()); 
    }

    /// <summary>
    /// 异步加载场景
    /// </summary>
    private IEnumerator LoadingScene()
    {
        AsyncOperation asyncOperation = SceneManager.LoadSceneAsync(1); //异步加载1号场景
        asyncOperation.allowSceneActivation = false;//不允许场景立即激活//异步进度在 allowSceneActivation= false时，会卡在0.89999的一个值，这里乘以100转整形
        while (asyncOperation.progress < 0.9f)//当异步加载小于0.9f的时候
        {
            targetProgress = (in