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 #if UNITY_EDITOR using UnityEngine; using UnityEditor; using System;

[InitializeOnLoad] //Unity启动的时候执行编辑器的脚本 需要静态的构造函数

static class DrawIcon

{     static Texture2D icon;     //静态的构造函数     static DrawIcon()     {         callback();     }

    private static void callback()

    {        

        EditorApplication.hierarchyWindowItemOnGUI = (EditorApplication.HierarchyWindowItemCallback)Delegate.Combine(EditorApplication.hierarchyWindowItemOnGUI,              new EditorApplication.HierarchyWindowItemCallback(HierarchyWindowItemOnGUI));                      }         private static void HierarchyWindowItemOnGUI(int instanceID, Rect selectionRect)     {         GameObject gameObject = EditorUtility.InstanceIDToObject(instanceID) as GameObject;         if (gameObject != null)         {             var trans = gameObject.GetComponentsInChildren<Transform>(true);

            Rect position = new Rect(selectionRect);

            position.x = position.width + (selectionRect.x - 40);             position.width = 40;             position.height = 16f;             GUI.Label(position, trans.Length.ToString());         }     } } #endif

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