添加保存按钮

直接在LevelEditor脚本的OnGUI代码块中添加下列代码

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var saveButtonRect = new Rect(Screen.width - 110,Screen.height - 60, 100, 50);
if (GUI.Button(saveButtonRect, "Save", mRightButtonStyle.Value))
{

}

我们需要保存的信息是当前场景物品的位置和名称，首先在LevelEidtor脚本内部新建一个需要保存序列化信息的类

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class LevelItemInfo
{
    public string Name;
    public float X;
    public float Y;
}

添加保存逻辑

将保存逻辑都写入之前OnGUI代码块中

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var saveButtonRect = new Rect(Screen.width - 110,Screen.height - 60, 100, 50);
if (GUI.Button(saveButtonRect, "Save", mRightButtonStyle.Value))
{
    var infos = new List<LevelItemInfo>(transform.childCount);
    foreach (Transform child in transform)
    {
        infos.Add(new LevelItemInfo()
                  {
                      Name = child.name,
                      X = child.position.x,
                      Y = child.position.y
                  });
    }
    var document = new XmlDocument();
    var declaration = document.CreateXmlDeclaration("1.0", "UTF-8","");
    document.AppendChild(declaration);

    var level = document.CreateElement("Level");
    document.AppendChild(level);

    foreach (var levelItemInfo in infos)
    {
        var levelItem = document.CreateElement("LevelItem");
        levelItem.SetAttribute("name", levelItemInfo.Name);
        levelItem.SetAttribute("x", levelItemInfo.X.ToString());
        levelItem.SetAttribute("y", levelItemInfo.Y.ToString());
        level.AppendChild(levelItem);
    }
    
    //可以用下面的代码输出Xml来查看保存的内容
    //Debug.Log(docement.InnerXml);//输出的Xml不带排版，比较杂乱
    //或者使用下面的方法
    StringBuilder stringBuilder = new StringBuilder();
    using(StringWriter stringWriter = new StringWriter(stringBuilder))
    {
        using(XmlTextWriter xmlTextWriter = new XmlTextWriter(stringWriter))
        {
            xmlTextWriter.Formatting = Formatting.Indented;
            level.WriteTo(xmlTextWriter);
            Debug.Log(stringWriter.ToString());
        }
    }
    //观察验证保存内容无误后，删除查看Xml的代码
}

添加数据持久化逻辑

还是和上面一样的位置，我们删除打印Xml的代码，然后修改

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if (GUI.Button(saveButtonRect, "Save", mRightButtonStyle.Value))
{
    //...

    foreach (var levelItemInfo in infos)
    {
        var levelItem = document.CreateElement("LevelItem");
        levelItem.SetAttribute("name", levelItemInfo.Name);
        levelItem.SetAttribute("x", levelItemInfo.X.ToString());
        levelItem.SetAttribute("y", levelItemInfo.Y.ToString());
        level.AppendChild(levelItem);
    }

    //我们在编辑器环境下保存
    #if UNITY_EDITOR
        var levelFileFolder = Application.dataPath + "/LevelFiles";
    if (!Directory.Exists(levelFileFolder))
    {
        Directory.CreateDirectory(levelFileFolder);
    }

    var levelFilePath = levelFileFolder + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".xml";
    try
    {

        document.Save(levelFilePath);
    }
    catch (Exception ex)
    {
        Debug.LogError(ex.Message);
    }
    #endif
}

添加解析逻辑

修改LevelPlayer脚本

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using System.IO;
using System.Linq;
using System.Xml;
using UnityEngine;

namespace ShootingEditor2D
{
    public class LevelPlayer : MonoBehaviour
    {
        static string mLevelFilesFolder;
        private void Awake()
        {
            mLevelFilesFolder = Application.dataPath + "/LevelFiles";
        }
        enum State//添加状态，用于进入场景后隐藏GUI
        {
            Selection,//选择存档阶段
            Playing//选择完后游玩阶段
        }
        private State mCurrentState = State.Selection;
        void ParseAndRun(string xml)
        {
            var document = new XmlDocument();
            document.LoadXml(xml);

            var levelNode = document.SelectSingleNode("Level");

            foreach (XmlElement levelItemNode in levelNode.ChildNodes)
            {
                var ItemArrtibutes = levelItemNode.Attributes;
                var levelItemName = ItemArrtibutes["name"].Value;
                var levelItemX = int.Parse(ItemArrtibutes["x"].Value);
                var levelItemY = int.Parse(ItemArrtibutes["y"].Value);

                var levelItemPrefab = Resources.Load<GameObject>(levelItemName);
                var levelItemGameobject = Instantiate(levelItemPrefab, transform);
                levelItemGameobject.transform.position = new Vector3(levelItemX, levelItemY, 0);
            }
        }
        private void OnGUI()
        {
            if(mCurrentState == State.Selection)
            {
                var filePaths = Directory.GetFiles(mLevelFilesFolder);

                int y = 10;//每有一个存档，就多向下绘制一个按钮

                foreach (var filePath in filePaths.Where(f => f.EndsWith("xml")))
                {
                    var fileName = Path.GetFileName(filePath);

                    if (GUI.Button(new Rect(10, y, 100, 40), fileName))//根据场景名字绘制按钮
                    {
                        var xml = File.ReadAllText(filePath);
                        Debug.Log(xml);
                        ParseAndRun(xml);
                        mCurrentState = State.Playing;
                    }

                    y += 50;
                }
            }
        }
    }
}

进入LevelPlayer场景，点击运行后，选择我们保存的场景运行。