ChivaFrameWork/Author/Scripts/SpriteAnimation.cs

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

public class SpriteAnimation : MonoBehaviour
{
    public float speed = 0.5f;

    public List<Sprite> sprites;

    public Image img;

    private int index = 0;
    private float timer = 0;

    void Update()
    {
        index %= sprites.Count;

        img.sprite = sprites[index];

        timer += Time.deltaTime * 0.1f;

        if(timer >= speed)
        {
            index++;
            timer = 0;
        }
    }
}