解决“使子项超出范围”异常 [英] Addressing 'Transform child out of bounds' exception

问题描述

当父级<$ c $时，我将子级 GameObject 的 SetActive 设置为true。 c> GameObject 被触发。

I'm going to set the child GameObject's SetActive to true when the parent GameObject is triggered.

像这张照片一样， BallIndigo1 是父级 GameoOject 和 x 是子对象 GameObject ，位于 SetActive（false）中。

Like this picture, BallIndigo1 is the parent GameoOject and x is the child GameObject which is in SetActive(false).

，我这样编写代码：

void OnTriggerEnter2D(Collider2D col)
{
    if (col.gameObject.activeSelf == true)
    {
        if (col.transform.GetChild(0) != null)
        {
            col.transform.GetChild(0).gameObject.SetActive(true);
        }
        else
        {
            Debug.Log("No child");
        }
    }
}

但结果显示：

我不知道为什么会这样，如何解决它。

I don't know why this happened and how to fix it.

推荐答案

之所以会这样，是因为GameObject传递给了 OnTriggerEnter2D 函数 col.transform 没有孩子。您可以通过检查 col.transform.childCount>来解决此问题。 0 ，然后调用 col.transform.GetChild（0）。

You are getting this because the GameObject passed to the OnTriggerEnter2D function col.transform doesn't have a child. You can fix that by checking if col.transform.childCount > 0 before calling col.transform.GetChild(0).

void OnTriggerEnter2D(Collider2D col)
{
    if (col.gameObject.activeSelf == true)
    {
        if (col.transform.childCount > 0 && col.transform.GetChild(0) != null)
        {
            col.transform.GetChild(0).gameObject.SetActive(true);
        }
        else
        {
            Debug.Log("No child");
        }
    }
}

---

如果您100％确定此对象有子对象，则将检测到另一个没有子对象的GameObject。您必须在调用 col.transform.GetChild（0）之前按 tag 或 layer 过滤此GameObject。创建一个名为 Ball的标签，将要检测的对象设置为此标签。确保此球对象有一个孩子。下面的代码应检查该标记，并应避免该错误。

---

If you are 100% sure that this Object has a child then there is another GameObject that is being detected that doesn't have a child. You must filter this GameObject out by tag or layer before calling col.transform.GetChild(0). Create a tag named "Ball" set the Objects you want to detect to this tag. Make sure that the this "Ball" object has a child. The code below should check for that tag and should get ride of that error.

void OnTriggerEnter2D(Collider2D col)
{
    if (col.CompareTag("Ball"))
    {
        if (col.gameObject.activeSelf == true)
        {
            if (col.transform.GetChild(0) != null)
            {
                col.transform.GetChild(0).gameObject.SetActive(true);
            }
            else
            {
                Debug.Log("No child");
            }
        }
    }
}

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