Unity中使用图集

一、制作图集

使用工具：free texture packer

备注：导出格式选Unity 3D

二、使用图集

使用工具：TexturePackerImporter

1、导入图集

导入到资源目录中

2、编辑器使用图集

3、代码中使用图集

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TexturesTool
{
    /// <summary>
    /// 缓存资源
    /// </summary>
    private Dictionary<string, Dictionary<string, Sprite>> spriteAtlasSourceName = new Dictionary<string, Dictionary<string, Sprite>>();

    public Sprite LoadSpriteInAtlas(string path, string spriteName)
    {
        if (LoadSpriteAtlasInResource(path))
        {
            return LoadSpriteInCache(path, spriteName);
        }
        else
        {
            return null;
        }
    }
    /// <summary>
    /// 从缓存中加载资源
    /// </summary>
    /// <param name="path"></param>
    /// <param name="spriteName"></param>
    /// <returns></returns>
    private Sprite LoadSpriteInCache(string path, string spriteName)
    {
        if (spriteAtlasSourceName[path].ContainsKey(spriteName))
        {
            return spriteAtlasSourceName[path][spriteName];
        }
        else
        {
            Debug.Log(string.Format("资源集{0}中不存在资源{1}", path, spriteName));
            return null;
        }
    }

    /// <summary>
    /// 加载资源
    /// </summary>
    /// <param name="path"></param>
    /// <returns></returns>
    private bool LoadSpriteAtlasInResource(string path)
    {
        if (spriteAtlasSourceName.ContainsKey(path))
        {
            return true;
        }

        spriteAtlasSourceName.Add(path, new Dictionary<string, Sprite>());
        var sprites = Resources.LoadAll<Sprite>(path);
        if (sprites == null)
        {
            Debug.Log("资源不存在：" + path);
            return false;
        }

        for (int i = 0; i < sprites.Length; i++)
        {
            spriteAtlasSourceName[path].Add(sprites[i].name, sprites[i]);
        }

        return true;

    }
}