SpriteSheet.cs

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using System.Collections.Generic;
using UnityEngine;
 
public class SpriteSheet : MonoBehaviour
{
    public static Dictionary<string, Sprite> dict = new Dictionary<string, Sprite>();
 
    public static HashSet<string> loadedPath = new HashSet<string>();
 
    public static void Add(Sprite sprite)
    {
        dict[sprite.name] = sprite;
    }
 
    public static void Add(string path)
    {
        if (!loadedPath.Contains(path))
        {
            Sprite[] array = Resources.LoadAll<Sprite>(path);
            foreach (Sprite sprite in array)
            {
                dict[sprite.name] = sprite;
            }
            loadedPath.Add(path);
        }
    }
 
    public static Sprite Get(string id)
    {
        return dict.TryGetValue(id);
    }
 
    public static Sprite Get(string path, string id)
    {
        if (!loadedPath.Contains(path))
        {
            Add(path);
        }
        dict.TryGetValue(id, out var value);
        return value;
    }
}