Unity编辑器拓展之二十三:基于ObjectField的FileField
使用场景
最近在做资源管理模块时,关于资源引用这方面的问题,并不想直接引用某一个asset ,比如Prefab、或者sprite、material等资源,当然可以由资源管理模块统一管理,然后对业务层提供获取的接口。由业务层传入文件名、或者AssetBundle Name、path之类的数据,资源管理模块内加载出来然后返回。结合ObjectFiled这个编辑器类来介绍,我们拖入某一个asset,然后序列化存储其guid和asset path,表面上看起来是引用了该asset,实际上只是存住了guid和path(用于load,结合资源管理模块而定),guid用于绝对指向asset资源,就算路径更改,也不怕引用丢失。
ObjectField介绍
https://docs.unity3d.com/2017.2/Documentation/ScriptReference/EditorGUI.ObjectField.html
FileField实现
private string[] FileField(Rect position, string label, string guid,Type type)
{
string[] guidPath = new string[2];//存储guid和path,这里的path是assetPath,实际存储起来需要做一步处理,处理成资源管理模块能load的path或者别的数据
string path = AssetDatabase.GUIDToAssetPath(guid);
UnityEngine.Object file = AssetDatabase.LoadAssetAtPath(path,type);
EditorGUI.BeginChangeCheck();
{
//编辑器上显示的是ObjectField绘制出来的
file = EditorGUI.ObjectField(position, label, file, type, false);
}
if (EditorGUI.EndChangeCheck())
{
path = AssetDatabase.GetAssetPath(file);
guid = AssetDatabase.AssetPathToGUID(path);
}
guidPath[0] = guid;
guidPath[1] = path;
return guidPath;
}
不算完整的代码:
using UnityEditor;
using UnityEngine;
using System;
using System.IO;
using IdleGames.Core.AssetManagement;
[CustomPropertyDrawer(typeof(WeakReferenceAttribute), true)]
public class WeakReferenceBaseDrawer : PropertyDrawer
{
public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
{
WeakReferenceAttribute attribute = (WeakReferenceAttribute)base.attribute;
Type referenceType = typeof(GameObject);
if (attribute != null)
{
referenceType = attribute.AssetType;
}
SerializedProperty guidProperty = property.FindPropertyRelative("_guid");
SerializedProperty pathProperty = property.FindPropertyRelative("_path");
Rect guidRect = position;
string[] guidPath = FileField(guidRect, property.displayName, guidProperty.stringValue,referenceType);
guidProperty.stringValue = guidPath[0];
//这里演示的是把path存成了Resources文件夹下的path
if (string.IsNullOrEmpty(guidPath[1]) == false && guidPath[1].Contains("Resources/"))
{
int index = guidPath[1].LastIndexOf("Resources/") + "Resources/".Length;
string path = guidPath[1].Substring(index);
path = path.Remove(path.LastIndexOf("."));
pathProperty.stringValue = path;
}
property.serializedObject.ApplyModifiedProperties();
}
private string[] FileField(Rect position, string label, string guid,Type type)
{
string[] guidPath = new string[2];
string path = AssetDatabase.GUIDToAssetPath(guid);
UnityEngine.Object file = AssetDatabase.LoadAssetAtPath(path,type);
EditorGUI.BeginChangeCheck();
{
file = EditorGUI.ObjectField(position, label, file, type, false);
}
if (EditorGUI.EndChangeCheck())
{
path = AssetDatabase.GetAssetPath(file);
guid = AssetDatabase.AssetPathToGUID(path);
}
guidPath[0] = guid;
guidPath[1] = path;
return guidPath;
}
}
上述代码仅供参考,拖入的object与实际序列化存储的不是同一个东西时,可以用上述类似的思路
以上知识分享,如有错误,欢迎指出,共同学习,共同进步。