Cacher is the code snippet organizer for pro developers

using UnityEngine;
using System.Collections;

class AnimatedTexture : MonoBehaviour
{
    public int columns = 2;
    public int rows = 2;
    public float framesPerSecond = 10f;

    //the current frame to display
    private int index = 0;

    void Start()
    {
        StartCoroutine(updateTiling());

        //set the tile size of the texture (in UV units), based on the rows and columns
        Vector2 size = new Vector2(1f / columns, 1f / rows);
        GetComponent<Renderer>().sharedMaterial.SetTextureScale("_MainTex", size);
    }

    private IEnumerator updateTiling()
    {
        while (true)
        {
            //move to the next index
            index++;
            if (index >= rows * columns)
                index = 0;

            //split into x and y indexes
            Vector2 offset = new Vector2((float)index / columns - (index / columns), //x index
                                          (index / columns) / (float)rows);          //y index

            GetComponent<Renderer>().sharedMaterial.SetTextureOffset("_MainTex", offset);
            yield return new WaitForSeconds(1f / framesPerSecond);
        }
    }
}