最近項目遇到個極為蛋疼的需求，因為某SDK不支持新版本,Unity需要蔥2019降為2018. 2018導入2019的工程后，Unity自帶的大量腳本丟失引用，一時頭禿。

最后只能研究了下手動以文本方式打開prefab，對比新舊版本Unity腳本的FileID和GUID字段，寫個腳本遍歷工程中所有prefab，進行替換。

關于查看丟失引用的情況，推薦Maintainer插件，非常好用?https://assetstore.unity.com/packages/tools/utilities/maintainer-32199?locale=zh-CN

關于FileID和GUID可以參考這篇博文https://www.cnblogs.com/CodeGize/p/8697227.html

using System.Collections.Generic; using System.IO; using UnityEditor; using UnityEngine;public class ProcessUnityVersion {public static Dictionary<string, string> replaceDict = new Dictionary<string, string>(){{"m_Script: {fileID: 11500000, guid: 5f7201a12d95ffc409449d95f23cf332, type: 3}", "m_Script: {fileID: 708705254, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 3245ec927659c4140ac4f8d17403cc18, type: 3}", "m_Script: {fileID: 1741964061, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: fe87c0e1cc204ed48ad3b37840f39efc, type: 3}", "m_Script: {fileID: -765806418, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 0cd44c1031e13a943bb63640046fad76, type: 3}", "m_Script: {fileID: 1980459831, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: dc42784cf147c0c48a680349fa168899, type: 3}", "m_Script: {fileID: 1301386320, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 31a19414c41e5ae4aae2af33fee712f6, type: 3}", "m_Script: {fileID: -1200242548, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 1392445389, guid: f70555f144d8491a825f0804e09c671c, type: 3}", "m_Script: {fileID: 11500000, guid: a65f502c9af7751458beffa2a6c253c3, type: 3}"},{"m_Script: {fileID: 11500000, guid: 8a8695521f0d02e499659fee002a26c2, type: 3}", "m_Script: {fileID: -2095666955, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 1344c3c82d62a2a41a3576d8abb8e3ea, type: 3}", "m_Script: {fileID: -98529514, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 4e29b1a8efbd4b44bb3f3716e73f07ff, type: 3}", "m_Script: {fileID: 1392445389, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: e19747de3f5aca642ab2be37e372fb86, type: 3}","m_Script: {fileID: -900027084, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 306cc8c2b49d7114eaa3623786fc2126, type: 3}","m_Script: {fileID: 1679637790, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{" m_Script: {fileID: 11500000, guid: 1aa08ab6e0800fa44ae55d278d1423e3, type: 3}","m_Script: {fileID: 1367256648, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 30649d3a9faa99c48a7b1166b86bf2a0, type: 3}","m_Script: {fileID: -405508275, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 86710e43de46f6f4bac7c8e50813a599, type: 3}","m_Script: {fileID: -1254083943, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 67db9e8f0e2ae9c40bc1e2b64352a6b4, type: 3}","m_Script: {fileID: -113659843, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 59f8146938fff824cb5fd77236b75775, type: 3}","m_Script: {fileID: 1297475563, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: d199490a83bb2b844b9695cbf13b01ef, type: 3}","m_Script: {fileID: 575553740, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: 9085046f02f69544eb97fd06b6048fe2, type: 3}","m_Script: {fileID: 2109663825, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},{"m_Script: {fileID: 11500000, guid: d0b148fe25e99eb48b9724523833bab1, type: 3}","m_Script: {fileID: -1862395651, guid: f70555f144d8491a825f0804e09c671c, type: 3}"},};[MenuItem("Tool/替換低版本引用")]public static void Process(){ProcessAllPrefabs();}private static void ProcessAllPrefabs(){List<GameObject> prefabs = new List<GameObject>();var resourcesPath = Application.dataPath;var absolutePaths = System.IO.Directory.GetFiles(resourcesPath, "*.prefab", System.IO.SearchOption.AllDirectories);for (int i = 0; i < absolutePaths.Length; i++){Debug.Log("prefab name: " + absolutePaths[i]);foreach (var VARIABLE in replaceDict){ReplaceValue(absolutePaths[i],VARIABLE.Key, VARIABLE.Value );}EditorUtility.DisplayProgressBar("處理預制體……", "處理預制體中……", (float)i/absolutePaths.Length);}EditorUtility.ClearProgressBar();}/// <summary>/// 替換值/// </summary>/// <param name="strFilePath">txt等文件的路徑</param>private static void ReplaceValue(string strFilePath, string oldLine, string newLine){if (File.Exists(strFilePath)){string[] lines = System.IO.File.ReadAllLines(strFilePath);for (int i = 0; i < lines.Length; i++){lines[i] = lines[i].Replace(oldLine, newLine);}File.WriteAllLines(strFilePath, lines);}} }

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