通过拖拽prefab来存储相应的路径

 1 using UnityEngine;
 2 using System.Collections;
 3 using UnityEditor;
 4 using System.Reflection;
 5
 6 [CustomPropertyDrawer(typeof(ObjectToPathAttribute))]
 7 public class ObjectToPathDrawer : PropertyDrawer
 8 {
 9     Object _obj = null;
10
11     public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
12     {
13         Object target = property.serializedObject.targetObject;
14         FieldInfo fi = target.GetType().GetField(property.name);
15
16         string path = string.Empty;
17         EditorGUI.LabelField(position, label);
18         position.x += EditorGUIUtility.labelWidth * 2.0f / 3.0f;
19         if (_obj == null)
20         {
21             path = fi.GetValue(target).ToString();
22             if (!string.IsNullOrEmpty(path))
23             {
24                 _obj = AssetDatabase.LoadMainAssetAtPath(path);
25             }
26             _obj = EditorGUI.ObjectField(position, _obj, typeof(GameObject), false);
27         }
28         else
29         {
30             _obj = EditorGUI.ObjectField(position, _obj, typeof(GameObject), false);
31             path = AssetDatabase.GetAssetPath(_obj);
32             fi.SetValue(target, path);
33         }
34
35         position.x += EditorGUIUtility.labelWidth * 2.0f / 3.0f;
36         EditorGUI.TextField(position, path);
37     }
38 }

ObjectToPathDrawer

public class ObjectToPathAttribute : PropertyAttribute
{
    public string _input;
    public ObjectToPathAttribute(string matchineName)
    {
        _input = matchineName;
    }
}

ObjectToPathAttribute

using UnityEngine;
using System.Collections;

public class UITest: MonoBehaviour
{
    [ObjectToPath("UITest)]
    public string _itemPerfabPath;

    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {

    }
}

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。截图如下：

当prefab为空的时候的截图如下：