[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 > 0)
            {
                go = typeGoDic[type][0];
                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;
    }
}