GameObject.activeInHierarchy

# [GameObject](https://docs.unity3d.com/cn/2019.4/ScriptReference/GameObject.html).activeInHierarchy

public bool **activeInHierarchy** ;

## 描述

定义 GameObject 在 Scene 中是否处于活动状态。

这可使您知道 GameObject 在游戏中是否处于活动状态。如果启用了其 [GameObject.activeSelf](https://docs.unity3d.com/cn/2019.4/ScriptReference/GameObject-activeSelf.html) 属性，以及其所有父项的这一属性，则该 GameObject 处于活动状态。

```
//This script shows how the activeInHierarchy state changes depending on the active state of the GameObject’s parent

using UnityEngine;

public class ActiveInHierarchyExample : MonoBehaviour
{
    //Attach these in the Inspector
    public GameObject m_ParentObject, m_ChildObject;
    //Use this for getting the toggle data
    bool m_Activate;

void Start()
    {
        //Deactivate parent GameObject and toggle
        m_Activate = false;
    }

void Update()
    {
        //Activate the GameObject you attach depending on the toggle output
        m_ParentObject.SetActive(m_Activate);
    }

void OnGUI()
    {
        //Switch this toggle to activate and deactivate the parent GameObject
        m_Activate = GUI.Toggle(new Rect(10, 10, 100, 30), m_Activate, "Activate Parent GameObject");

if (GUI.changed)
        {
            //Output the status of the GameObject's active state in the console
            Debug.Log("Child GameObject Active : " + m_ChildObject.activeInHierarchy);
        }
    }
}
```

与 [GameObject.activeSelf](https://docs.unity3d.com/cn/2019.4/ScriptReference/GameObject-activeSelf.html) 不同，它还检查是否有父 GameObject 影响此 GameObject 的当前活动状态。

当停用父 GameObject 时，即使其子项不可见，通常也会将它们标记为活动，这样根据 [GameObject.activeSelf](https://docs.unity3d.com/cn/2019.4/ScriptReference/GameObject-activeSelf.html)，它们仍处于活动状态。但 [GameObject.activeInHierarchy](https://docs.unity3d.com/cn/2019.4/ScriptReference/GameObject-activeInHierarchy.html) 会确认其层级视图中的成员尚未停用此 GameObject，从而确保不会发生这种情况。

```
//This script shows how activeInHierarchy differs from activeSelf. Use the toggle  to alter the parent and child GameObject’s active states. This makes it output the child GameObject’s state in the console.
//It also shows how activeSelf outputs that the child GameObject is active when the parent is not, while the activeInHierarchy lists the child GameObject as inactive.

using UnityEngine;

public class ActiveInHierarchyExample : MonoBehaviour
{
    public GameObject m_ParentObject, m_ChildObject;
    //Use this for getting the toggle data
    bool m_ActivateParent, m_ActivateChild;
    //Use these for deciding if console is needing updated
    bool m_HierarchyOutput, m_SelfOutput;

void Start()
    {
        //Deactivate parent and child GameObjects and toggles
        m_ActivateParent = false;
        m_ActivateChild = false;
        //Ables script to output current state of GameObject to console
        m_HierarchyOutput = false;
        m_SelfOutput = false;
    }

void Update()
    {
        //Activates the GameObject you attach depending on the toggle output
        m_ParentObject.SetActive(m_ActivateParent);
        m_ChildObject.SetActive(m_ActivateChild);

//Find out if the GameObject is active in the Game and checks if this state has been output to the console
        if (m_HierarchyOutput == false)
        {
            //Output the state of the GameObject’s activity if it hasn't already been output
            Debug.Log("Object Active : " + m_ChildObject.activeInHierarchy);
            //The state of the GameObject is output already, so no need to do it again
            m_HierarchyOutput = true;
        }
        //Check to see if the assigned GameObject is active despite parent GameObject's status
        if (m_ChildObject.activeSelf &amp;&amp; m_SelfOutput == false)
        {
            //Output the message if the GameObject is still active
            Debug.Log("Child Active, parent might not be");
            //You no longer need to output the message
            m_SelfOutput = true;
        }
    }

void OnGUI()
    {
        //Switch this toggle to activate and deactivate the parent GameObject
        m_ActivateParent = GUI.Toggle(new Rect(10, 10, 100, 30), m_ActivateParent, "Activate Parent GameObject");
        //Switch this toggle to activate and deactivate the child GameObject
        m_ActivateChild = GUI.Toggle(new Rect(10, 40, 100, 30), m_ActivateChild, "Activate Child GameObject");

//If a change is detected with the toggle, the console outputs updates
        if (GUI.changed)
        {
            m_SelfOutput = false;
            m_HierarchyOutput = false;
        }
    }
}
```