int corazones; 
List<Image> corazonesUI = new List<Image>(); //de "UnityEngine.UI"
public Transform parentCorazonesUI;
//...
void Start(){
for(int i=0 ; i< parentCorazonesUI.childCount ; i++){
       corazonesUI.Add( parentCorazonesUI.GetComponent<Image>() );
    }
}
//se dió que cambió el num de corazones llamás a esto
void ActualizarCorazones(){
for(int i=0 ; i< corazonesUI.Count ; i++){    
       corazonesUI.enabled = i < corazones;   //true si i es menor a corazones, false si no es así        
    }
}

void Start(){
  for(int i=0 ; i< parentCorazonesUI.childCount ; i++){
          corazonesUI.Add( parentCorazonesUI.GetComponent<Image>() );
          //posDeRef la que vos quieras , offset lo definis como quieras, en tu imagen sería Vector2.right * offsetX (en pixels)
          corazonesUI.rectTransform.anc***dPosition = posDeRef + i * Offset;
      }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CrtPlayerLifes : MonoBehaviour
{
public GameObject Player;
public GameObject LifeObject;
public GameObject PnlLifes;
public float AddPosition;
private Vector3 LifeObjectPosition;
private Stack<GameObject> StackLifes;
private int InitLifes;
private int MaxLifes;
// Use this for initialization
void Start () {
   LifeObjectPosition    = LifeObject.GetComponent<Transform>().position;
   InitLifes          = (int)Player.GetComponent<CrtPlayerController> ().InitAmountLifes;
   MaxLifes          = (int)Player.GetComponent<CrtPlayerController> ().MaxAmountLifes;
   StackLifes          = new Stack<GameObject>();
   InitializeLifes ();
}
private void InitializeLifes()
{
   for(int i = 1; i <= InitLifes; i++)
      CreateLife ();
}
public void CreateLife()
{
   if (StackLifes.Count < MaxLifes)
   {
      Vector3 PosicionActualLife   = (StackLifes.Count > 0) ? StackLifes.Peek ().GetComponent<Transform>().position : LifeObjectPosition;
      PosicionActualLife.x       += AddPosition;
      GameObject ActualLife       = Instantiate (LifeObject, PosicionActualLife, Quaternion.identity);
      int Position             = StackLifes.Count + 1;
      ActualLife.transform.parent = PnlLifes.transform;
      ActualLife.name            = "Life" + Position;
      StackLifes.Push (ActualLife);
   }
}
public void DestroyLife()
{
   if (StackLifes.Count > 0)
   {
      GameObject ActualLife = StackLifes.Pop ();
      Destroy (ActualLife.gameObject);
      LifeObjectPosition.x -= AddPosition;
   }
}
}

StackLifes.Peek ().GetComponent<Transform>().position