问我需要在运行时统一2d替换sprite

EN

using UnityEngine;
using System.Collections;

public class PlayerBehavior : MonoBehaviour {

  public enum Skins 
  {
    normal,
    verde
  }

  private Skins skinAtual; 

  private Rigidbody2D player;
  public float height;
  private Transform posicao;
  public float jumpForce = 10f;
  private AudioSource audio;
  public DeathMenu deathMenu;
  private float initialX;
  public float goBackSpeed = 10f;
  Object[] BGMusics;
  //private SpriteRenderer sprite;

  public SpriteRenderer[] sprites;

  public Sprite skinVerde, skinNormal; 


  void Start () {

    //skinAtual = Skins.normal;
    skinAtual = Skins.verde;
    //sprite = GetComponent<SpriteRenderer> ();
    player = GetComponent<Rigidbody2D> ();
    BGMusics = Resources.LoadAll ("Music/BG");
    initialX = transform.position.x;


    //skinVerde = Resources.Load<Sprite> ("Sprites/BOYrECORTADOvERDE");
    skinVerde = Resources.Load<Sprite> ("Sprites/PersonagemFatiado_verde");
    skinNormal = Resources.Load<Sprite> ("Sprites/PersonagemFatiado");

  }

  private void UpdateSkin(Sprite novaSprite)
  {
    foreach (var item in sprites) {
      item.sprite = novaSprite;
    }
  }


  void Update () 
  {

    switch (skinAtual) {

    case Skins.normal:
      UpdateSkin (skinNormal);
      break; 
    case Skins.verde:
      UpdateSkin (skinVerde);
      break;
    default:
      break;
    }

    if (Input.GetKeyDown (KeyCode.Escape))
      Pause.INSTANCE.Pausing ();

    if (Pause.isPaused)
      return;       

    if (Application.isEditor)
      inputComputer ();
    else if(Application.isMobilePlatform)
      inputMobile ();

    FixePosition ();
  }

  void FixePosition()
  {
    if (transform.position.x <= initialX) return;

    var newPX = Mathf.Lerp (transform.position.x, initialX, Time.deltaTime * goBackSpeed);
    transform.position = new Vector3 (newPX, transform.position.y); 

  } 

  private void inputMobile(){
    if(Input.GetMouseButtonDown(0))
      playerJump ();
  }

  private void inputComputer(){

    if(Input.GetKeyDown(KeyCode.Space))
      playerJump ();
  }

  private void playerJump(){
    if (player.transform.position.y <= -8.93000f ) 
    {
      player.AddForce (new Vector2 (0, height * jumpForce), ForceMode2D.Impulse);
      MusicManager.INSTANCE.JumpSound ();
    }
  }

  void PlayRandom(){
    int i = Random.Range(0, BGMusics.Length); // index sortido
    AudioClip m = (AudioClip) BGMusics[i]; // uma referencia ao audioclip sortido
    GetComponent<AudioSource>().PlayOneShot(m); // tocamos esse audioclip
  }

  void Reset(){
    GetComponent<AudioSource>().playOnAwake = false; // aqui tira o play on awake do audio source
  }


  // CONFIGURANDO OS TRIGGERS E SUAS ACOES
  void OnTriggerEnter2D(Collider2D col)
  {
    if(col.gameObject.CompareTag("Heart"))
    {
      Score.INSTANCE.AddPoints ();
      col.gameObject.SetActive (false);
      Handheld.Vibrate ();
      //TOCAR
      PlayRandom ();

    } 
    else 
    {
      if (col.gameObject.tag == "Doctor") 
      {
        MusicManager.INSTANCE.DeathSong ();
        player.gameObject.SetActive (false);
        Handheld.Vibrate ();
        ToggleEndMenu();
      }
    }

  }

  void ToggleEndMenu()
  {
    deathMenu.ToggleEndMenu (Score.INSTANCE.GetScore ()); //Send to DeathMenu the Score value
  }
}