Unity项目较大刷新及编译卡顿解决方法

开发中当Unity项目比较大的时候，每次Unity窗口获取焦点时刷新需要3-5秒，非常麻烦！常见有几种方法来缓解这个问题：

•      关闭unity自动刷新Edit->Preferences->General->Auto Refresh，改为自己手动Ctrl+R刷新；

        缺点：每次都需要手动刷新比较麻烦

•    修改unity的ScriptChangesWhilePlaying选项Editor->Preferences->General->Script Changes While Playing

        Recompile And Continue Playing 编译并继续播放

        Recompile After Finished Playing 停止播放后再编译

        Stop Playing And Recompile 停止播放进行编译

•  开发工具在Editor模式自动检查资源变更自动刷新，代码如下：

        第一步：检查开发过程中需要及时刷新的资源，如：Scripts目录，prefab目录

        第二步：获取最后改动时间是否与上一次检查的时间一致，不一致则启动刷新

        第三步：将时间写入文件缓存，方便下一次对比

        第四步：在窗口获取焦点以及Playing启动时启动检测

#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Security.Cryptography;

[InitializeOnLoad]
public class EditorNotification : AssetPostprocessor
{
    private static bool isFocused;
    private static bool isPlaymode;
    static EditorNotification()
    {
        EditorApplication.update -= Update;
        EditorApplication.update += Update;
        EditorApplication.playmodeStateChanged -= PlaymodeStateChanged;
        EditorApplication.playmodeStateChanged += PlaymodeStateChanged;
    }

    private static void Update()
    {
        if (isFocused == UnityEditorInternal.InternalEditorUtility.isApplicationActive)
        {
            return;
        }
        isFocused = UnityEditorInternal.InternalEditorUtility.isApplicationActive;
        OnEditorFocus(isFocused);
    }

    private static void PlaymodeStateChanged()
    {
        if(EditorApplication.isPlayingOrWillChangePlaymode && !isPlaymode)
        {
            //Debug.LogError(EditorApplication.isPlaying.ToString() + " - " + EditorApplication.isPlayingOrWillChangePlaymode.ToString());
            isPlaymode = true;
            Refresh();
        }
        else if(!EditorApplication.isPlayingOrWillChangePlaymode && !EditorApplication.isPlaying)
        {
            isPlaymode = false;
        }
    }
    /// <summary>
    /// Unity窗口聚焦状态改变回调
    /// </summary>
    /// <param name="focus"></param>
    private static void OnEditorFocus(bool focus)
    {
        if (focus)
        {
            //Debug.LogErrorFormat("编辑器激活状态:{0}", focus);
            if(!EditorApplication.isPlaying && !EditorApplication.isPlayingOrWillChangePlaymode)
            {
                Refresh();
            }
        }
    }

    private void OnPreprocessAsset()
    {
        //Debug.LogError("Asset下文件改变时回调");
    }

    //[MenuItem("File/RefreshManual")]
    static void Refresh()
    {
        bool needRefresh = false;
        MD5File md5 = new MD5File();
        System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
        sw.Reset();
        sw.Start();
        string path = Path.Combine($"{Application.dataPath}/../Library", "md5Refresh.dat");
        if(File.Exists(path))
        {
            FileStream fs = new FileStream(path, FileMode.OpenOrCreate);
            BinaryFormatter bin = new BinaryFormatter();
            md5 = (MD5File)bin.Deserialize(fs);
            fs.Close();
        }
        
        string scriptPath = Path.Combine($"{Application.dataPath}", "Scripts");
        DirectoryInfo dinfo = new DirectoryInfo(scriptPath);
        FileInfo[] fileInfos = dinfo.GetFiles("*.cs", SearchOption.AllDirectories);
        foreach(FileInfo file in fileInfos)
        {
            string timestr = file.LastWriteTime.ToLongTimeString();
            string value = string.Empty;
            if(md5.m_DicMD5.TryGetValue(file.FullName, out value))
            {
                System.DateTime dt = System.DateTime.Parse(value);
                System.DateTime dt2 = System.DateTime.Parse(timestr);
                if(!System.DateTime.Equals(dt, dt2))
                {
                    needRefresh = true;
                    md5.m_DicMD5[file.FullName] = timestr;
                    Debug.LogError(file.FullName + " - " + value + " -- " + timestr);
                }
            }
            else
            {
                needRefresh = true;
                md5.m_DicMD5.Add(file.FullName, timestr);
                Debug.LogError(file.FullName + " -------- " + timestr);
            }
        }

        {
            FileStream fs = new FileStream(path, FileMode.OpenOrCreate);
            BinaryFormatter bin = new BinaryFormatter();
            bin.Serialize(fs, md5);
            fs.Close();
        }
        sw.Stop();
        string str = "C#变更检查结束，不需要刷新！";
        if (needRefresh)
        {
            str = "C#变更检查结束，需要刷新！";
            string t = (sw.Elapsed.TotalMilliseconds / 1000).ToString("N2");
            Debug.LogError($"{str}FileCount:{fileInfos.Length} Time:{t}秒");
            AssetDatabase.Refresh();
            EditorUtility.RequestScriptReload();
        }
    }
}
#endif

using System.Collections;
using System.Collections.Generic;

[System.Serializable]
public class MD5File
{
    public Dictionary<string, string> m_DicMD5 = new Dictionary<string, string>();
}

 这种方法只需要检查少部分资源自动刷新，基本没有卡顿，体验相对比较好！