游戏对象被销毁时如何激活触发器？

Question

我想在该区域的敌人被杀死时激活/启用 TriggerCollider。敌人不是按特定顺序出现的，因此无法将脚本添加到单个敌人。 我创建了一个空的游戏对象并附在下面（错误的）脚本。我想做if( the public game objects are destroyed) activate trigger。

你知道正确的吗？

public class ActivateDialogueTrigger : MonoBehaviour {

    public GameObject DialogueTrigger;

    public GameObject Enemy01;
    public GameObject Enemy02;
    public GameObject Enemy03;
    public GameObject Enemy04;
    public GameObject Enemy05;
    public GameObject Enemy06;

    void Start () {

        DialogueTrigger.SetActive(false);       
    }


    void Update () {
        if(gameobjects.destroyed){

            DialogueTrigger.SetActive(true);
        }
    }
}

Answer 1

我看到了两种选择：一种是“挑剔”但干净，另一种是快速、“肮脏”且效率较低。

使用事件

您可以为每个对象附加一个脚本，该脚本负责在对象被销毁时调度事件。

public class OnDestroyDispatcher : MonoBehaviour
{
    public event System.Action<GameObject> OnObjectDestroyed ;
    private void OnDestroy()
    {
        if( OnObjectDestroyed != null ) OnObjectDestroyed( gameObject ) ;
    }
}

然后，在您的脚本中：

public class ActivateDialogueTrigger : MonoBehaviour
{
    // Drag & drop the objects in the inspector
    public OnDestroyDispatcher[] OnDestroyDispatchers ;

    // You will be able to add a function once all the objects are destroyed
    public UnityEngine.Events.UnityEvent OnAllObjectsDestroyed;
    
    void Start ()
    {
    
        for( int i = 0 ; i < OnDestroyDispatchers.Length ; ++i )
            OnDestroyDispatchers[i].OnObjectDestroyed += OnObjectDestroyed ;
    }
    
    
    private void OnObjectDestroyed (GameObject destroyedObject)
    {

        CheckAllObjectsAreDestroyed();       
    }
    
    
    private void CheckAllObjectsAreDestroyed ()
    {    
        for( int i = 0 ; i < OnDestroyDispatchers.Length ; ++i )
        {
            if( OnDestroyDispatchers[i] != null || OnDestroyDispatchers[i].gameObject != null )
                return ;
        }

        if( OnAllObjectsDestroyed != null )
            OnAllObjectsDestroyed.Invoke() ;       
    }

}

---

通过池化每一帧

对象被销毁后，对 null 的相等性检查将返回 true。该对象实际上并不是真正的 null，而是“==”运算符被重载，以便您可以检查该对象是否已被销毁。

public class ActivateDialogueTrigger : MonoBehaviour
{
    // Drag & drop the objects in the inspector
    public GammeObject[] YourGameObjects ;

    // You will be able to add a function once all the objects are destroyed
    public UnityEngine.Events.UnityEvent OnAllObjectsDestroyed;
    
    void Update ()
    {
        CheckAllObjectsAreDestroyed();
    }
    
    private void CheckAllObjectsAreDestroyed ()
    {    
        for( int i = 0 ; i < YourGameObjects.Length ; ++i )
        {
            if( YourGameObjects[i] != null )
                return ;
        }

        if( OnAllObjectsDestroyed != null )
            OnAllObjectsDestroyed.Invoke() ;       
    }

}