Unity工具—Inspector面板增加Rect Transform组件上下左右移动的工具

以下内容是根据Unity 2020.1.0f1版本进行编写的

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1、目的

日常使用UGUI时，经常有需要把某个GameObject往上/下/左/右移动一个像素或10个像素的需求，每次改都要一个个选中然后改Pos的值，因此想写个小工具方便处理。
 

2、实现

本质上是写一个RectTransform类的Editor类，并继承自RectTransformEditor，难点在于RectTransformEditor是内部类，不能继承，需要用反射拿出来。
这个问题其实问AI就可以了，AI给出的答案也比较简单和清晰。

直接上完整代码：

using UnityEngine;
using UnityEditor;
using System;
using System.Reflection;[CanEditMultipleObjects]
[CustomEditor(typeof(RectTransform),true)]
public class RectTransformExtend : Editor
{private Editor defaultEditor;  // 存储默认编辑器实例public RectTransformExtend (){}private void OnEnable(){// 通过反射创建默认RectTransformEditor实例Type rectTransformEditorType = Type.GetType("UnityEditor.RectTransformEditor, UnityEditor");if (rectTransformEditorType != null){defaultEditor = Editor.CreateEditor(targets, rectTransformEditorType);}}public override void OnInspectorGUI(){// 绘制默认的RectTransform界面if (defaultEditor != null){MethodInfo onInspectorGUI = defaultEditor.GetType().GetMethod("OnInspectorGUI", BindingFlags.Public | BindingFlags.Instance);onInspectorGUI?.Invoke(defaultEditor, null);}GUILayout.BeginVertical();GUILayout.BeginHorizontal();if (GUILayout.Button("↑10")){MovePos(new Vector3(0, 10, 0));}if (GUILayout.Button ("↑")){MovePos(new Vector3(0, 1, 0));}if (GUILayout.Button("↑20")){MovePos(new Vector3(0, 20, 0));}GUILayout.EndHorizontal ();GUILayout.BeginHorizontal ();if (GUILayout.Button("←10")){MovePos(new Vector3(-10, 0, 0));}if (GUILayout.Button ("←")){MovePos(new Vector3(-1, 0, 0));}if (GUILayout.Button ("→")){MovePos(new Vector3(1, 0, 0));}if (GUILayout.Button("→10")){MovePos(new Vector3(10, 0, 0));}GUILayout.EndHorizontal ();GUILayout.BeginHorizontal();if (GUILayout.Button("↓10")){MovePos(new Vector3(0, -10, 0));}if (GUILayout.Button ("↓")){MovePos(new Vector3(0, -1, 0));}if (GUILayout.Button("↓20")){MovePos(new Vector3(0, -20, 0));}GUILayout.EndHorizontal();GUILayout.EndVertical ();}public void MovePos(Vector3 vertor){foreach (var obj in targets){RectTransform rectTrans = (RectTransform)obj;rectTrans.localPosition = rectTrans.localPosition + vertor;Undo.RecordObject(obj, "move RectTransform 1px");EditorUtility.SetDirty(obj);}}
}

和上面说的一样，就是用反射获取到RectTransformEditor这个类，然后在OnInspectorGUI方法中添加所需的按钮和对应方法即可。我这里还支持了多选操作和撤销。
 

3、效果