Unity 异步加载场景

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

public class AsyncTest : MonoBehaviour
{

    AsyncOperation operation;

    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(loadScene());
    }

    //协程方法用来异步加载场景
    IEnumerator loadScene(){
        operation = SceneManager.LoadSceneAsync(1);
        //加载完场景不要自动跳转
        //operation.allowSceneActivation 默认为true,意味自动跳转
        operation.allowSceneActivation = false;
        yield return operation;
    }

    float timer = 0;

    // Update is called once per frame
    void Update()
    {
        //输出加载进度 0-0.9 最大为0.9
        Debug.Log(operation.progress);   
        timer += Time.deltaTime;
        //如果到达5秒，再跳转
        if (timer > 5){
            operation.allowSceneActivation = true;
        }
    }
}