Way to move sprite position from code on each keyframe change

Hi. I want to do the following:
- On every keyframe change I move the sprite position to a new position.

I have the following:
- An animation of 12 FPS with 26 keyframes, each with a different sprite.
- A Vector3 array with 26 elements, each with a position for it's corresponding keyframe.

Is there an event/callback on Unity 4.3 that can help me achieve this?
If not, how could I go about this?

I've tried a couple of workarounds:
- A simple frame counter, each time the frame counter reached 5, I incremented a frameIndex
- Each time the sprite name changes, increment the frameIndex.
Neither worked since the position keeps getting out of sync with my sprite:

Before Unity4.3, with the 2D framework Orthello2D, I could do this with delegate OnAnimationFrame. This way, every time the frame changed on my animation I could move it's position.

 

Well, I found another approach, I post my solution here in case anyone is curious:

Code (csharp):

1.    
2. void Update ()
3. {
4.     // First I get the current sprite name
5.     string spriteName = aSpriteRenderer.sprite.name;
6.  
7.     // I changed the sprite names to be:  pu_0, pu_1, pu_2, pu_3 ... pu_25
8.     // Now I can just use the number at the end as my array index, so I extract it.
9.     string[] nameAndIndex = spriteName.Split ( '_' );
10.     int frameIndex = int.Parse( nameAndIndex[1] );
11.  
12.     // Finally I change the position of an empty gameObject that's parent of my sprite based on the frame index
13.     aSpriteContainer.transform.position = animPosArr[ frameIndex ];
14. }
15.  

This way I can change the position reliably.