技術標籤：工具

編輯器下的一些操作預設是不可撤銷的，如建立、銷燬物體，使用Undo可以將某個操作標記為可撤銷操作，Ctrl+Z即可撤銷

官方文件

例項：

using UnityEngine;
using UnityEditor;

public class TestUndoEditorWindow
{

    [InitializeOnLoadMethod]
    public static void Init()
    {
        SceneView.duringSceneGui += DuringSceneGui;
    }

    private static void DuringSceneGui(SceneView sceneView)
    {
        Handles.BeginGUI();
        if(GUI.Button(new Rect(0,10,100,20),"建立單個Cube"))
        {
            //手動對可撤銷操作分組
            Undo.IncrementCurrentGroup();
            //建立Cube
            GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube);

            //銷燬Cube
            //Undo.DestroyObjectImmediate(cube);
            //標記可撤銷操作
            Undo.RegisterCreatedObjectUndo(cube,"建立單個Cube : " + cube.name);
        }
        if(GUI.Button(new Rect(0,35,100,20),"建立多個Cube"))
        {
            Undo.IncrementCurrentGroup();

            for(int i = 0; i < 5; i++)
            {
                GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube);
                cube.transform.position = new Vector3(i * 1.5f,0,0);
                Undo.RegisterCreatedObjectUndo(cube,"建立多個Cube : " + cube.name);
            }
        }
        Handles.EndGUI();
    }

}