【小工具】Unity批量对预制体添加内容

AddPrefabTool

介绍

批量向指定物体添加子物体

使用场景

假设有10个动物，需要给所有动物添加一个球作为子物体

工具原理

• OGUI绘制Windows窗口

EditorGUILayout.TextField("Title", _filePath)
(GameObject)EditorGUILayout.ObjectField("Title", _prefab, typeof(GameObject), true);

• AssetDatabase处理编辑器下资源操作

//获取预制体
string[] guids = AssetDatabase.FindAssets("t:Prefab", new[] { _filePath });
foreach (string guid in guids)
{
     string assetPath = AssetDatabase.GUIDToAssetPath(guid);
 	 GameObject prefab = AssetDatabase.LoadAssetAtPath<GameObject>(assetPath);
}

• PrefabUtility对预制体进行操作

// 打开预制体进行编辑
GameObject prefabInstance = PrefabUtility.LoadPrefabContents(assetPath);

// 实例化预制体
GameObject instantiate = PrefabUtility.InstantiatePrefab(_prefab) as GameObject;

// 保存对预制体的修改
PrefabUtility.SaveAsPrefabAsset(prefabInstance, assetPath);

// 卸载预制体内容
PrefabUtility.UnloadPrefabContents(prefabInstance);

• AssetDatabase 刷新资产数据

AssetDatabase.Refresh();

代码

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

public class AddPrefabTool : EditorWindow
{
    private string _filePath = "YourFilePath";
    private string _parent = "YourParent";
    private GameObject _prefab;

    [MenuItem("Tools/AddPrefabTool")]
    public static void ShowWindow()
    {
        GetWindow<AddPrefabTool>();
    }

    private void OnGUI()
    {
        GUILayout.Label("批量向模型添加内容", EditorStyles.boldLabel);
        _filePath = EditorGUILayout.TextField("被添加的物体路径", _filePath);
        _parent = EditorGUILayout.TextField("被添加的物体父物体名字", _parent);
        _prefab = (GameObject)EditorGUILayout.ObjectField("添加的物体", _prefab, typeof(GameObject), true);
        if (GUILayout.Button("添加"))
        {
            AddPrefab();
        }
    }

    private void AddPrefab()
    {
        // 查找指定文件夹中的所有预制体
        string[] guids = AssetDatabase.FindAssets("t:Prefab", new[] { _filePath });
        foreach (string guid in guids)
        {
            string assetPath = AssetDatabase.GUIDToAssetPath(guid);
            GameObject prefab = AssetDatabase.LoadAssetAtPath<GameObject>(assetPath);

            if (prefab != null)
            {
                // 打开预制体进行编辑
                GameObject prefabInstance = PrefabUtility.LoadPrefabContents(assetPath);

                // 查找预制体中的 _parent子物体

                Transform modelTransform = string.IsNullOrEmpty(_parent)
                    ? prefabInstance.transform
                    : prefabInstance.transform.Find(_parent);
                if (modelTransform == null)
                {
                    Debug.LogError($"No 'Model' child found in prefab at {assetPath}");
                    PrefabUtility.UnloadPrefabContents(prefabInstance);
                    continue;
                }

                // 检查是否已经存在名为 _prefab 的子物体，避免重复添加
                if (modelTransform.Find(_prefab.name) == null)
                {
                    // 实例化 _prefab 预制体并将其作为 _parent 的子物体
                    GameObject instantiate = PrefabUtility.InstantiatePrefab(_prefab) as GameObject;
                    if (instantiate != null)
                    {
                        instantiate.transform.SetParent(modelTransform, false);
                        instantiate.name = _prefab.name;
                    }

                    // 保存对预制体的修改
                    PrefabUtility.SaveAsPrefabAsset(prefabInstance, assetPath);
                }
                else
                {
                    Debug.LogWarning($"'Shadow' already exists in prefab at {assetPath}");
                }

                // 卸载预制体内容
                PrefabUtility.UnloadPrefabContents(prefabInstance);
            }
        }

        // 刷新资产数据库
        AssetDatabase.Refresh();
    }
}