Single sprite from spritesheet

public class AtlasLoader
{
    public Dictionary<string, Sprite> spriteDic = new Dictionary<string, Sprite>();

    //Creates new Instance only, Manually call the loadSprite function later on 
    public AtlasLoader()
    {

    }

    //Creates new Instance and Loads the provided sprites
    public AtlasLoader(string spriteBaseName)
    {
        loadSprite(spriteBaseName);
    }

    //Loads the provided sprites
    public void loadSprite(string spriteBaseName)
    {
        Sprite[] allSprites = Resources.LoadAll<Sprite>(spriteBaseName);
        if (allSprites == null || allSprites.Length <= 0)
        {
            Debug.LogError("The Provided Base-Atlas Sprite `" + spriteBaseName + "` does not exist!");
            return;
        }

        for (int i = 0; i < allSprites.Length; i++)
        {
            spriteDic.Add(allSprites[i].name, allSprites[i]);
        }
    }

    //Get the provided atlas from the loaded sprites
    public Sprite getAtlas(string atlasName)
    {
        Sprite tempSprite;

        if (!spriteDic.TryGetValue(atlasName, out tempSprite))
        {
            Debug.LogError("The Provided atlas `" + atlasName + "` does not exist!");
            return null;
        }
        return tempSprite;
    }

    //Returns number of sprites in the Atlas
    public int atlasCount()
    {
        return spriteDic.Count;
    }
}