How to display my lives using UI in my PlayerMovement class?

I don't understand how UI works really well, I'm trying to display my lives, and try to see if my simple lives system is working. I did is UI thing before, In my ScoreManager Class when displaying the score. but In my dead OnTriggerEnter and lives is in the playermovent class but I did a Coroutine with the die and spawn system in my GameManagerClass, I know I cant put the PlayerMovement script in the text component. Do i have to make a playerdead class with lives or do this in my GameManager? I did a simple UI with my ScoreManager and it work when i put the ScoreManager in the text component. Here's the scripts of my PlayerMovement, GameManager.

PlayerMovement

Code (CSharp):

1. //References
2.     public static int Lives = 3;
3.     public GameManager gameManager;
4.  
5. void Start ()
6.     {
7.         gameManager = FindObjectOfType<GameManager> ();
8.  
9.     }
10.  
11. void OnTriggerEnter2D (Collider2D other)
12.     {
13.         if (other.transform.tag == "Enemy")
14.         {
15.             PlayerMovement.Lives--;
16.             Debug.Log("Lost a Life");
17.             gameManager.RespawnPlayer();
18.         }
19.      
20.     }
21.  

GameManager

Code (CSharp):

1. public GameObject currentCheckpoint;
2.     private PlayerMovement player;
3.     public float respawnDelay;
4.  
5.  
6. public void RespawnPlayer()
7.     {
8.  
9.         StartCoroutine ("RespawnPlayerCo");
10.     }
11.      
12.  
13.  
14.     public IEnumerator RespawnPlayerCo()
15.     {
16.         player.enabled = false;
17.         player.renderer.enabled = false;
18.         player.rigidbody2D.isKinematic = true;
19.         player.transform.position = currentCheckpoint.transform.position;
20.         yield return new WaitForSeconds (respawnDelay);
21.         player.enabled = true;
22.         player.renderer.enabled = true;
23.         player.rigidbody2D.isKinematic = false;
24.         Debug.Log("Respawn");
25.     }
26. }

 

NeverMind, Fix it on here at Unity tutorals http://unity3d.com/learn/tutorials/projects/survival-shooter/scoring-points