Unity 中 JsonUtility的使用

写一个Json文件  格式如下 必须是一个{}  UIPanelType.json

{
"infoList":
[
{"panelTypeString":"ItemMessage",
"path":"UIPanel/ItemMessagePanel"},

{"panelTypeString":"Knapsack",
"path":"UIPanel/KnapsackPanel"},

{"panelTypeString":"MainMenu",
"path":"UIPanel/MainMenuPanel"},

{"panelTypeString":"Shop",
"path":"UIPanel/ShopPanel"},

{"panelTypeString":"Skill",
"path":"UIPanel/SkillPanel"},

{"panelTypeString":"System",
"path":"UIPanel/SystemPanel"},

{"panelTypeString":"Task",
"path":"UIPanel/TaskPanel"}

]
}

using System;

public class UIManager {

    /// 
    /// 单例模式的核心
    /// 1，定义一个静态的对象 在外界访问 在内部构造
    /// 2，构造方法私有化

    private static UIManager _instance;

    public static UIManager Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = new UIManager();
            }
            return _instance;
        }
    }

    private Transform canvasTransform;
    private Transform CanvasTransform
    {
        get
        {
            if (canvasTransform == null)
            {
                canvasTransform = GameObject.Find("Canvas").transform;
            }
            return canvasTransform;
        }
    }
    private Dictionary<UIPanelType, string> panelPathDict;//存储所有面板Prefab的路径
    private Dictionary<UIPanelType, BasePanel> panelDict;//保存所有实例化面板的游戏物体身上的BasePanel组件
    private Stack<BasePanel> panelStack;

    private UIManager()
    {
        ParseUIPanelTypeJson();
    }

    /// <summary>
    /// 把某个页面入栈，  把某个页面显示在界面上
    /// </summary>
    public void PushPanel(UIPanelType panelType)
    {
        if (panelStack == null)
            panelStack = new Stack<BasePanel>();

        //判断一下栈里面是否有页面
        if (panelStack.Count > 0)
        {
            BasePanel topPanel = panelStack.Peek();
            topPanel.OnPause();
        }

        BasePanel panel = GetPanel(panelType);
        panel.OnEnter();
        panelStack.Push(panel);
    }
    /// <summary>
    /// 出栈 ，把页面从界面上移除
    /// </summary>
    public void PopPanel()
    {
        if (panelStack == null)
            panelStack = new Stack<BasePanel>();

        if (panelStack.Count <= 0) return;

        //关闭栈顶页面的显示
        BasePanel topPanel = panelStack.Pop();
        topPanel.OnExit();

        if (panelStack.Count <= 0) return;
        BasePanel topPanel2 = panelStack.Peek();
        topPanel2.OnResume();

    }

    /// <summary>
    /// 根据面板类型 得到实例化的面板
    /// </summary>
    /// <returns></returns>
    private BasePanel GetPanel(UIPanelType panelType)
    {
        if (panelDict == null)
        {
            panelDict = new Dictionary<UIPanelType, BasePanel>();
        }

        //BasePanel panel;
        //panelDict.TryGetValue(panelType, out panel);//TODO

        BasePanel panel = panelDict.TryGet(panelType);

        if (panel == null)
        {
            //如果找不到，那么就找这个面板的prefab的路径，然后去根据prefab去实例化面板
            //string path;
            //panelPathDict.TryGetValue(panelType, out path);
            string path = panelPathDict.TryGet(panelType);
            GameObject instPanel = GameObject.Instantiate(Resources.Load(path)) as GameObject;
            instPanel.transform.SetParent(CanvasTransform,false);
            panelDict.Add(panelType, instPanel.GetComponent<BasePanel>());
            return instPanel.GetComponent<BasePanel>();
        }
        else
        {
            return panel;
        }

    }

    [Serializable]
    class UIPanelTypeJson
    {
        public List<UIPanelInfo> infoList;
    }
    private void ParseUIPanelTypeJson()
    {
        panelPathDict = new Dictionary<UIPanelType, string>();

        TextAsset ta = Resources.Load<TextAsset>("UIPanelType");

        UIPanelTypeJson jsonObject = JsonUtility.FromJson<UIPanelTypeJson>(ta.text);

        foreach (UIPanelInfo info in jsonObject.infoList) 
        {
            //Debug.Log(info.panelType);
            panelPathDict.Add(info.panelType, info.path);
        }
    }

    /// <summary>
    /// just for test
    /// </summary>
    public void Test()
    {
        string path ;
        panelPathDict.TryGetValue(UIPanelType.Knapsack,out path);
        Debug.Log(path);
    }
}

下面是 UIPanelInfo.cs

using UnityEngine;
using System.Collections;
using System;

[Serializable]
public class UIPanelInfo :ISerializationCallbackReceiver {
    [NonSerialized]
    public UIPanelType panelType;
    public string panelTypeString;
    //{
    //    get
    //    {
    //        return panelType.ToString();
    //    }
    //    set
    //    {
    //        UIPanelType type =(UIPanelType)System.Enum.Parse(typeof(UIPanelType), value);
    //        panelType = type;
    //    }
    //}
    public string path;

    // 反序列化   从文本信息 到对象
    public void OnAfterDeserialize()
    {
        UIPanelType type = (UIPanelType)System.Enum.Parse(typeof(UIPanelType), panelTypeString);
        panelType = type;
    }

    public void OnBeforeSerialize()
    {
        
    }
}

以下是 UIPanelType.cs

using UnityEngine;
using System.Collections;
using System;


public enum UIPanelType  {
    ItemMessage,
    Knapsack,
    MainMenu,
    Shop,
    Skill,
    System,
    Task
}

这句代码用来读取 Resources目录下名为UIPanelType名字的 文件 返回一个 ta对象

TextAsset ta = Resources.Load<TextAsset>("UIPanelType");

下面代码用来解析ta.text 为 UIPanelTypeJson的对象

UIPanelTypeJson jsonObject = JsonUtility.FromJson<UIPanelTypeJson>(ta.text);

注意 UIPanelTypeJson类 要标识为 可序列号 如下：

    [Serializable]
    class UIPanelTypeJson
    {
        public List<UIPanelInfo> infoList;
    }

UIPanelInfo 类 需要实现 ISerializationCallbackReceiver 这个接口  用来响应 序列化过程中的两个方法 OnAfterDeserialize （序列化结束）和 OnBeforeSerialize（序列化前）

 

以下代码 将 string类型 转换成 enum类型

UIPanelType type = (UIPanelType)System.Enum.Parse(typeof(UIPanelType), panelTypeString);

 相关教程 请参阅 UI框架 - 基于Unity5.3UGUI  课时11-12的讲解