RiftMayhem/Assets/Scripts/Items/SpriteIndexer.cs

using Kryz.CharacterStats.Examples;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpriteIndexer : MonoBehaviour
{
    #region Singleton
    private static SpriteIndexer _instance;

    // Public reference to the singleton instance
    public static SpriteIndexer Instance
    {
        get
        {
            return _instance;
        }
    }
    #endregion

    public List<Sprite> Sprites = new List<Sprite>();

    protected void Awake()
    {
        // Ensure there's only one instance
        if (_instance != null && _instance != this)
        {
            Destroy(gameObject);
            return;
        }

        // If this is the first instance, set it as the singleton
        _instance = this;
        DontDestroyOnLoad(gameObject);
    }

    private void OnValidate()
    {
        if (Sprites == null) return;

        foreach (Sprite item in Resources.FindObjectsOfTypeAll<Sprite>())
        {
            if (Sprites.Contains(item)) continue;

            Sprites.Add(item);
        }
    }
}