Transform.GetSiblingIndex

描述

获取同级索引。

使用此方法返回游戏对象的同级索引。如果一个游戏对象与其他游戏对象共享父级，并且处于同一级别（即它们共享同一个直接父级），则这些游戏对象被称为同级。同级索引显示每个游戏对象在该同级层次结构中的位置。

使用 GetSiblingIndex 找出游戏对象在该层次结构中的位置。当游戏对象的同级索引发生更改时，它在层次结构窗口中的顺序也会发生更改。这在您有意对游戏对象的子对象进行排序时很有用，例如在使用布局组组件时。

布局组也会根据它们的索引在视觉上重新排列该组。要详细了解布局组，请参阅 自动布局。要设置游戏对象的同级索引，请参阅 Transform.SetSiblingIndex。

//This script demonstrates how to return (GetSiblingIndex) and change (SetSiblingIndex) the sibling index of a GameObject.
//Attach this script to the GameObject you would like to change the sibling index of.
//To see this in action, make this GameObject the child of another GameObject, and create siblings for it.


using UnityEngine;

public class TransformGetSiblingIndex : MonoBehaviour
{
    //Use this to change the hierarchy of the GameObject siblings
    int m_IndexNumber;

    void Start()
    {
        //Initialise the Sibling Index to 0
        m_IndexNumber = 0;
        //Set the Sibling Index
        transform.SetSiblingIndex(m_IndexNumber);
        //Output the Sibling Index to the console
        Debug.Log("Sibling Index : " + transform.GetSiblingIndex());
    }

    void OnGUI()
    {
        //Press this Button to increase the sibling index number of the GameObject
        if (GUI.Button(new Rect(0, 0, 200, 40), "Add Index Number"))
        {
            //Make sure the index number doesn't exceed the Sibling Index by more than 1
            if (m_IndexNumber <= transform.GetSiblingIndex())
            {
                //Increase the Index Number
                m_IndexNumber++;
            }
        }

        //Press this Button to decrease the sibling index number of the GameObject
        if (GUI.Button(new Rect(0, 40, 200, 40), "Minus Index Number"))
        {
            //Make sure the index number doesn't go below 0
            if (m_IndexNumber >= 1)
            {
                //Decrease the index number
                m_IndexNumber--;
            }
        }
        //Detect if any of the Buttons are being pressed
        if (GUI.changed)
        {
            //Update the Sibling Index of the GameObject
            transform.SetSiblingIndex(m_IndexNumber);
            Debug.Log("Sibling Index : " + transform.GetSiblingIndex());
        }
    }
}