通过拖拽prefab来存储相应的路径

更新了一下，支持数组和嵌套数据结构。

 using UnityEngine;

 using System.Collections;

 using UnityEditor;

 using System.Reflection;

 [CustomPropertyDrawer(typeof(ObjectToPathAttribute))]

 public class ObjectToPathDrawer : PropertyDrawer

 {

     public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)

     {

         Object target = property.serializedObject.targetObject;

         ObjectToPathAttribute otpa = attribute as ObjectToPathAttribute;

         System.Type objType = otpa._objType;

         string path = property.stringValue;

         position.width = EditorGUIUtility.labelWidth * 2.0f / 3.0f;

         EditorGUI.LabelField(position, label);

         position.x += EditorGUIUtility.labelWidth * 2.0f / 3.0f;

         Object _obj = null;

         bool _foundObj = true;

         if (!string.IsNullOrEmpty(path))

         {

             _obj = AssetDatabase.LoadMainAssetAtPath(path);

             if (_obj == null)

             {

                 _foundObj = false;

             }

         }

         _obj = EditorGUI.ObjectField(position, _obj, objType, false);

         if (_obj != null)

         {

             path = AssetDatabase.GetAssetPath(_obj);

         }

         else

         {

             if (_foundObj)

             {

                 path = string.Empty;

             }

         }

         position.x += EditorGUIUtility.labelWidth * 2.0f / 3.0f;

         position.width = EditorGUIUtility.labelWidth;

         property.stringValue = EditorGUI.TextField(position, path);

     }

 }

ObjectToPathDrawer

 using UnityEngine;

 using System.Collections;

 public class ObjectToPathAttribute : PropertyAttribute

 {

     public System.Type _objType;

     public ObjectToPathAttribute(System.Type t)

     {

         _objType = t;

     }

 }

ObjectToPathAttribute

 using UnityEngine;

 using System.Collections;

 public class TestClass : MonoBehaviour

 {

     [ObjectToPath(typeof(GameObject))]

     public string _prefabPath;

 }

TestClass

使用上面的代码可以通过拖拽一个prefab的方式把相应的路径直接存储到public string _itemPerfabPath里，省去键盘输入步骤。不支持场景中的GameObject的拖入。

截图如下：

当prefab为空的时候的截图如下：