Unity加载场景、计时器、加载时不销毁某物体

异步加载场景，SceneManager.LoadSceneAsync(SceneName);需引用 using UnityEngine.SceneManagement;命名空间，

Application.LoadLevel这个方法不再适用；

可以用协同程序做一个简单的计时器，详见代码；

DontDestroyOnLoad (this.gameObject);方法可以在加载场景时不销毁指定物体；

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

 public class Base : MonoBehaviour {

     public virtual void ScenesLoad(string SceneName,int AfterSomeMinutesToLoad)
     {
         StartCoroutine (Calculagraph(SceneName,AfterSomeMinutesToLoad));
     }
     IEnumerator Calculagraph(string SceneName,int AfterSomeMinutesToLoad)
     {
         yield return new WaitForSeconds (AfterSomeMinutesToLoad*);
         DontDestroyOnLoad (this.gameObject);
         SceneManager.LoadSceneAsync(SceneName);
     }
 }