Alex教程每一P的教程原代码加上我自己的理解初步理解写的注释，可供学习Alex教程的人参考
此代码仅为较上一P有所改变的代码

【Unity教程】从0编程制作类银河恶魔城游戏_哔哩哔哩_bilibili

FileDataHandler.cs

using System;
using System.IO;
using UnityEngine;
public class FileDataHandler
{private string dataDirPath = "";private string dataFileName = "";private bool encryptData = false;//是否加密判断private string codeWord = "sukaczev";//加密密码public FileDataHandler(string _dataDirPath, string _dataFilePath,bool _encryptData)//构造函数拿到需要保存的位置和文件名称{dataDirPath = _dataDirPath;dataFileName = _dataFilePath;encryptData = _encryptData;}public void Save(GameData _data){string fullPath = Path.Combine(dataDirPath, dataFileName);//合成路径函数 将位置和文件合并成实际的可以读取的路径try//用try防止其报错{Directory.CreateDirectory(Path.GetDirectoryName(fullPath));//通过路径创建出需要的文件，存在就不创建了string dataToStore = JsonUtility.ToJson(_data, true);//将传过来的gameData转换成文本形式并且使其可读if (encryptData)dataToStore = EncryptDecrypt(dataToStore);using (FileStream stream = new FileStream(fullPath, FileMode.Create))//两个using 第一个进入文件使其变为可编写模式{using (StreamWriter writer = new StreamWriter(stream))//第二个拿到文件对其进行编辑{writer.Write(dataToStore);//写入函数}}}catch (Exception e){Debug.LogError("Error on trying to save data to file " + fullPath + "\n" + e);}}public GameData Load()//同上{string fullPath = Path.Combine(dataDirPath, dataFileName);GameData loadData = null;if (File.Exists(fullPath))//存在才能操作{try{string dataToLoad = "";using (FileStream stream = new FileStream(fullPath, FileMode.Open)){using (StreamReader reader = new StreamReader(stream)){dataToLoad = reader.ReadToEnd();}}if(encryptData){dataToLoad = EncryptDecrypt(dataToLoad);}loadData = JsonUtility.FromJson<GameData>(dataToLoad);//转换为游戏需要的类型}catch (Exception e){Debug.LogError(e);}}return loadData;}public void Delete()//删除对应文件函数{string fullPath = Path.Combine(dataDirPath, dataFileName);if(File.Exists(fullPath))//存在才能删除 File操作{File.Delete(fullPath);}}private string EncryptDecrypt(string _data)//数据加密函数{string modifiedData = "";//返回的加密文件for(int i = 0;i <_data.Length;i++){modifiedData += (char)(_data[i] ^ codeWord[i % codeWord.Length]);//怎么把加密文件回退到没加密，搞不懂}return modifiedData;}
}

GameData.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;public class SaveManager : MonoBehaviour
{public static SaveManager instance;[SerializeField] private string fileName;[SerializeField] private bool encryptData;GameData gameData;private List<ISaveManager> saveManagers;private FileDataHandler dataHandler;[ContextMenu("Delete save file")]//把一个方法在Unity里面显示出来的做法private void DeleteSaveData()//调用并被公开的删除文件函数{dataHandler = new FileDataHandler(Application.persistentDataPath, fileName, encryptData);dataHandler.Delete();}private void Awake(){if (instance != null)Destroy(instance);elseinstance = this;}private void Start(){dataHandler = new FileDataHandler(Application.persistentDataPath, fileName, encryptData);saveManagers = FindAllSaveManagers();LoadGame();}public void NewGame(){gameData = new GameData();}public void LoadGame(){gameData = dataHandler.Load();if(this.gameData == null){Debug.Log("No data");NewGame();}foreach(ISaveManager saveManager in saveManagers)//循环调用所有的找到脚本的LoadData和SaveData到，这样便可以将所有的数据汇聚到gameData中，并从中拿到data{saveManager.LoadData(gameData);}Debug.Log("Loaded currency " + gameData.currency);}public void SaveGame()循环调用所有的找到脚本的LoadData和SaveData到，这样便可以将所有的数据汇聚到gameData中，并从中拿到data{foreach(ISaveManager saveManager in saveManagers){saveManager.SaveData(ref gameData);}dataHandler.Save(gameData);}private void OnApplicationQuit(){SaveGame();}private List<ISaveManager> FindAllSaveManagers()//全局寻找带ISave的脚本的函数{IEnumerable<ISaveManager> saveManager = FindObjectsOfType<MonoBehaviour>().OfType<ISaveManager>();return new List<ISaveManager>(saveManager);}
}