Unity协程未执行问题：生成的splash对象无法销毁

核心问题是启动协程的 GameObject 被提前销毁了。你在调用StartCoroutine(DestroySplash(_splashObj))之后立刻执行了Destroy(gameObject);，而Unity的协程依附于承载它的MonoBehaviour所在的GameObject——一旦这个GameObject被销毁，协程会直接终止，不会执行yield return之后的代码，所以控制台不会输出"DestroySplash"，splash对象也无法被销毁。

以下是几种可行的解决方案：

• 方案一：将自身销毁逻辑移到协程内，等splash对象销毁后再销毁自身
  修改代码如下：

  public GameObject splashObjPrefab;
  
  // 假设这段代码在某个方法内（如OnCollisionEnter或自定义方法）
  if (splash)
  {
      GameObject _splashObj = Instantiate(splashObjPrefab, this.transform.position, Quaternion.identity);
      _splashObj.transform.localScale = new Vector3(splashRange * 2, splashRange * 2, 1);
  
      StartCoroutine(DestroySplashThenSelf(_splashObj));
  
      Debug.Log("Run Coroutine");
  }
  
  private IEnumerator DestroySplashThenSelf(GameObject _splashObj)
  {
      yield return new WaitForSeconds(0.2f);
  
      Debug.Log("DestroySplash");
      Destroy(_splashObj);
      // 等splash销毁后再销毁自身
      Destroy(gameObject);
  }
  

• 方案二：让splash预制体自行处理销毁逻辑
  给splashObjPrefab添加一个简单的脚本：

  public class AutoDestroy : MonoBehaviour
  {
      public float destroyDelay = 0.2f;
  
      void Start()
      {
          Destroy(gameObject, destroyDelay);
      }
  }
  

  原脚本无需再启动协程，直接生成即可，自身销毁逻辑可保留：

  public GameObject splashObjPrefab;
  
  if (splash)
  {
      GameObject _splashObj = Instantiate(splashObjPrefab, this.transform.position, Quaternion.identity);
      _splashObj.transform.localScale = new Vector3(splashRange * 2, splashRange * 2, 1);
  
      Debug.Log("Splash object spawned");
  }
  
  Destroy(gameObject);
  

• 方案三：延迟销毁自身，给协程留足执行时间
  把Destroy(gameObject);改成延迟销毁，确保协程能执行完毕：

  public GameObject splashObjPrefab;
  
  if (splash)
  {
      GameObject _splashObj = Instantiate(splashObjPrefab, this.transform.position, Quaternion.identity);
      _splashObj.transform.localScale = new Vector3(splashRange * 2, splashRange * 2, 1);
  
      StartCoroutine(DestroySplash(_splashObj));
  
      Debug.Log("Run Coroutine");
  }
  
  // 延迟0.2秒以上销毁自身，让协程执行完毕
  Destroy(gameObject, 0.3f);
  

内容的提问来源于stack exchange，提问作者SJC