SpriteSwitcher.cs

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using UnityEngine;
 
namespace EchoTrio.UI {
    [RequireComponent(typeof(UnityEngine.UI.Image))]
    public class SpriteSwitcher : MonoBehaviour {
        [SerializeField] private Sprite[] sprites = new Sprite[0];
        [SerializeField] private int index = 0;
 
        public void CycleSprite() {
            index = (index + 1) % sprites.Length;
            GetComponent<UnityEngine.UI.Image>().sprite = sprites[index];
        }
 
        public void SetSprite(int index) {
            this.index = index;
            GetComponent<UnityEngine.UI.Image>().sprite = sprites[index];
        }
 
        private void OnValidate() {
            UnityEngine.UI.Image image = GetComponent<UnityEngine.UI.Image>();
            if (image != null && sprites[0] != null) {
                image.sprite = sprites[0];
            } else {
                image.sprite = null;
            }
        }
    }
}