Undo.RegisterChildrenOrderUndo

Parameters

Description

Stores a copy of the order of the object's children on the undo stack.

If the undo is performed, the order of the object's children will be restored to the recorded state.

using UnityEngine;
using UnityEditor;

public class UndoExamples
{
    [MenuItem("Undo Examples/RegisterChildrenOrderUndo")]
    static void Example()
    {
        var parent = new GameObject("Parent");
        for (int childIndex = 0; childIndex < 5; childIndex += 1)
        {
            var child = new GameObject($"Child{childIndex}");
            child.transform.parent = parent.transform;
        }

        // Store the states of the parent object.
        Undo.RegisterChildrenOrderUndo(parent.transform, "Set as last sibling");
        parent.transform.GetChild(0).SetAsLastSibling();

        // If you choose "Edit->Undo Set as last sibling" from the main menu now, the order of the children will be restored.
    }
}