如何激活父对象的子对象?

首先,你找不到一个带有GameObject的停用游戏对象。Find()方法。因为GameObject。Find()查找并返回“gameObject”,但场景中没有此名称的游戏对象。你应该找到这个游戏对象的变换。所以,如果你想激活子对象,试试这个。

(我假设此脚本附加到父对象)

using UnityEngine;
using System.Collections;

public class SetActiveOnTriggerEnter : MonoBehaviour {

    //public string FindGameOBJ; <-To be implemented for future re-usability. Ignore it for now.
    // public string ComponentToActivate; <-To be implemented for future re-usability. Ignore it for now.

    void OnTriggerEnter (Collider coll) // Collision detection.
    {
        if (coll.tag == "Ball") //Checks the tag to see if it is the PARENT OBJECT.
        {
                if (!transform.FindChild("BallHealZone").gameObject.activeInHierarchy) //This is better form for looking , but there is a one better way, GetChild. You can see it on below. 
                {
                    Debug.Log("Activating BallHealZone! :)"); //Tells me if it found said object, and confirms it is indeed null (yes it works).
                    transform.FindChild("BallHealZone").gameObject.SetActive(true); //Activates the CHILD OF PARENT OBJECT.
                    //or if you know index of child in parent you can use GetChild method for a faster one
                    transform.GetChild(indexOfChild).gameObject.SetActive(true); // this also activates child, but this is faster than FindChild method
                }
        }
    }
}

我希望这有帮助。

从外表来看 GameObject.Find("BallHealZone") 返回对的引用 gameObject 如果gameObject是 null 这意味着尚未创建此对象的引用。通常,这意味着在执行方法之前必须实例化对象,除非它是静态方法。

尝试插入 gameObject = new WHATEVEROBJECTTHISIS();

如果不是这样的话,你可以用更多的细节来扩展代码段吗。困扰我的是,如果对象为空,您应该会得到一个异常。我不知道为什么会发生这种情况。