Unity3D Hierarchy 窗口中显示文字

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

#if UNITY_EDITOR
using UnityEditor;
#endif

public class LuaOutlet : MonoBehaviour
{
    [System.Serializable]
    public class LuaOutInfo
    {
        public UnityEngine.Object obj;
        public string name;
    }

    public List<LuaOutInfo> infoList = new List<LuaOutInfo>();
}

#if UNITY_EDITOR

[CustomEditor(typeof(LuaOutlet))]
public class LuaOutletEditor : Editor
{
    private GUIStyle greenFontStyle;
    private GUIStyle redFontStyle;
    private static GUIStyle hierarchyItemStyle;

    private HashSet<string> cachedNameSet = new HashSet<string>();
    private static Dictionary<UnityEngine.Object, string> objectNameDict = new Dictionary<UnityEngine.Object, string>();

    static LuaOutletEditor()
    {
        EditorApplication.hierarchyWindowItemOnGUI += HierarchyItemCB;
    }

    private static void HierarchyItemCB(int instanceID, Rect selectionRect)
    {
        var obj = EditorUtility.InstanceIDToObject(instanceID) as GameObject;
        if (obj != null && objectNameDict.ContainsKey(obj))
        {
            Rect r = new Rect(selectionRect);
            r.x = r.width - 80;
            r.width = 80;
            GUI.Label(r, string.Format("=> '{0}'", objectNameDict[obj]), hierarchyItemStyle);
        }
    }

    private void OnEnable()
    {
        hierarchyItemStyle = new GUIStyle();
        hierarchyItemStyle.normal.textColor = Color.green;
        hierarchyItemStyle.hover.textColor = Color.cyan;

        greenFontStyle = new GUIStyle();
        greenFontStyle.fontStyle = FontStyle.Bold;
        greenFontStyle.fontSize = 11;
        greenFontStyle.normal.textColor = Color.green;

        redFontStyle = new GUIStyle();
        redFontStyle.fontStyle = FontStyle.Bold;
        redFontStyle.fontSize = 11;
        redFontStyle.normal.textColor = Color.red;
    }

    public override void OnInspectorGUI()
    {
        EditorGUI.BeginChangeCheck();

        var outlet = target as LuaOutlet;
        cachedNameSet.Clear();
        objectNameDict.Clear();

        if (outlet.infoList.Count == 0)
        {
            if (GUILayout.Button("Add LuaOutlet"))
            {
                outlet.infoList.Add(new LuaOutlet.LuaOutInfo());
            }
        }
        else
        {
            for (int i = outlet.infoList.Count - 1; i >= 0; i--)
            {
                var info = outlet.infoList[i];
                bool isValid = (info.obj != null && !cachedNameSet.Contains(info.name));
                cachedNameSet.Add(info.name);
                if (info.obj != null)
                {
                    objectNameDict.Add(info.obj, info.name);
                }

                EditorGUILayout.Separator();
                EditorGUILayout.BeginHorizontal();
                EditorGUILayout.LabelField(string.Format("Property:'{0}'", info.name), isValid ? greenFontStyle : redFontStyle);
                EditorGUILayout.Space();
                if (GUILayout.Button("+"))
                {
                    Undo.RecordObject(target, "add info");
                    outlet.infoList.Insert(i, new LuaOutlet.LuaOutInfo());
                }
                if (GUILayout.Button("-"))
                {
                    Undo.RecordObject(target, "remove info");
                    outlet.infoList.RemoveAt(i);
                }
                EditorGUILayout.EndHorizontal();

                info.name = EditorGUILayout.TextField("Name:", info.name);
                info.obj = EditorGUILayout.ObjectField("Object:", info.obj, typeof(UnityEngine.Object), true);
            }
        }

        if (EditorGUI.EndChangeCheck())
        {
            Undo.RecordObject(target, "change check");
        }
    }
}

#endif