Unity编辑器扩展——PrefabUtility

一：前言

PrefabUtility是一个静态类，用于Prefab的相关处理

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二：代码实现

——SavePrefabAsset
保存一个预制体，只能保存一个工程目录下的预制体

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    [MenuItem("Tools/PrefabTest")]
    private static void PrefabTest()
    {
        GameObject go = AssetDatabase.LoadAssetAtPath<GameObject>("Assets/Prefabs/test.prefab");
        PrefabUtility.SavePrefabAsset(go);
    }
}

——SaveAsPrefabAsset
 保存成一个预制体，只能保存一个场景中的游戏物体

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    [MenuItem("Tools/PrefabTest")]
    private static void PrefabTest()
    {
        string savePath = "Assets/Prefabs/go.prefab";
        PrefabUtility.SaveAsPrefabAsset(Selection.activeGameObject, savePath);
    }
}

——SaveAsPrefabAssetAndConnect
 保存成一个预制体并关联，只能保存一个场景中的游戏物体

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    [MenuItem("Tools/PrefabTest")]
    private static void PrefabTest()
    {
        string savePath = "Assets/Prefabs/go.prefab";
        PrefabUtility.SaveAsPrefabAssetAndConnect(Selection.activeGameObject, savePath, InteractionMode.AutomatedAction);
    }
}

——GetPrefabAssetPathOfNearestInstanceRoot
得到此预制体的根预制体所在路径

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    [MenuItem("Tools/PrefabTest")]
    private static void PrefabTest()
    {
        string str = PrefabUtility.GetPrefabAssetPathOfNearestInstanceRoot(Selection.activeObject);
        Debug.Log("path:" + str);
    }
}

——GetPrefabAssetType
得到预制体类型， NotAPrefab、Regular、Model、Variant、MissingAsset

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    [MenuItem("Tools/PrefabTest")]
    private static void PrefabTest()
    {
        PrefabAssetType type = PrefabUtility.GetPrefabAssetType(Selection.activeObject);
        Debug.Log("type:" + type);
    }
}

——GetNearestPrefabInstanceRoot
得到此预制体的根预制体游戏物体，只能传入一个场景中的游戏物体

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    [MenuItem("Tools/PrefabTest")]
    private static void PrefabTest()
    {
        GameObject go = PrefabUtility.GetNearestPrefabInstanceRoot(Selection.activeObject);
        Debug.Log("GameObject:" + go);
    }
}

——UnpackPrefabInstance
打断预制体关联，只能打断一个场景中的游戏物体

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    [MenuItem("Tools/PrefabTest")]
    private static void PrefabTest()
    {
        PrefabUtility.UnpackPrefabInstance(Selection.activeGameObject, PrefabUnpackMode.Completely, InteractionMode.AutomatedAction);
        Debug.Log("GameObject:" + go);
    }
}

——prefabInstanceUpdated
预制体更新时的回调（Apply时） 

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    public int a;

    [InitializeOnLoadMethod]
    static void PrefabTest()
    {
        PrefabUtility.prefabInstanceUpdated = OnPrefabUpdate;
    }

    static void OnPrefabUpdate(GameObject instance)
    {
        Debug.Log(instance);
    }
}

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三：常用功能

——一键保存场景中所有预制体

using UnityEditor;
using UnityEngine;

public class Test : MonoBehaviour
{
    [MenuItem("Tools/SaveAll")]
    private static void SaveAll()
    {
        GameObject[] gos = FindObjectsOfType<GameObject>();
        foreach (var temp in gos)
        {
            PrefabAssetType type = PrefabUtility.GetPrefabAssetType(temp);
            if (type == PrefabAssetType.Regular)
            {
                GameObject rootGo = PrefabUtility.GetNearestPrefabInstanceRoot(temp);
                string path = PrefabUtility.GetPrefabAssetPathOfNearestInstanceRoot(temp);
                PrefabUtility.SaveAsPrefabAssetAndConnect(rootGo, path, InteractionMode.AutomatedAction);
            }
        }
        AssetDatabase.Refresh();
    }
}