[UGUI]图文混排(三)：资源管理

1.图文混排中的资源，主要是图片。

2.所谓的资源管理，可以分为资源对象池和资源加载这两部分。这里是为图文混排单独做一套资源管理，当然也可以改为调用项目中的资源管理。

RichTextResourceManager.cs

 using UnityEngine;
 using System.Collections.Generic;
 using UnityEngine.UI;
 using System;
 #if UNITY_EDITOR
 using UnityEditor;
 #endif

 public enum RichTextResourceType
 {
     Image,
 }

 public class RichTextResourceManager : CSharpSingletion<RichTextResourceManager> {

     private Dictionary<RichTextResourceType, List<GameObject>> typeGoDic = new Dictionary<RichTextResourceType, List<GameObject>>();
     private DefaultControls.Resources resources = new DefaultControls.Resources();

     public void SetPoolObject(RichTextResourceType type, GameObject go)
     {
         if (!typeGoDic.ContainsKey(type))
         {
             List<GameObject> goList = new List<GameObject>();
             goList.Add(go);
             typeGoDic.Add(type, goList);
         }
         else
         {
             typeGoDic[type].Add(go);
         }
         go.SetActive(false);
     }

     public GameObject GetPoolObject(RichTextResourceType type)
     {
         GameObject go = null;
         if (typeGoDic.ContainsKey(type))
         {
             if (typeGoDic[type].Count > )
             {
                 go = typeGoDic[type][];
                 if (go)
                 {
                     go.SetActive(true);
                     typeGoDic[type].Remove(go);
                     return go;
                 }
             }
         }
         go = CreatePoolObject(type);
         return go;
     }

     private GameObject CreatePoolObject(RichTextResourceType type)
     {
         GameObject go = null;
         if (type == RichTextResourceType.Image)
         {
             go = CreateImage();
         }
         return go;
     }

     public void LoadSprite(string path, Action<Sprite> callback)
     {
 #if UNITY_EDITOR
         Sprite sprite = AssetDatabase.LoadAssetAtPath<Sprite>("Assets/" + path + ".png");
         if ((sprite != null) && (callback != null))
         {
             callback(sprite);
         }
 #endif
     }

     public void LoadSprite(string path, Action<Sprite[]> callback)
     {
 #if UNITY_EDITOR
         Sprite[] sprites = AssetDatabase.LoadAllAssetsAtPath("Assets/" + path + ".png") as Sprite[];
         if ((sprites != null) && (callback != null))
         {
             callback(sprites);
         }
 #endif
     }

     public void SetSprite(string path, Image image)
     {
         LoadSprite(path, (Sprite sprite) => { image.sprite = sprite; });
     }

     private GameObject CreateImage()
     {
         GameObject go = DefaultControls.CreateImage(resources);
         go.layer = LayerMask.NameToLayer("UI");
         Image image = go.GetComponent<Image>();
         image.raycastTarget = false;
         return go;
     }
 }