（NGUI）UISprite 切换图集

using UnityEngine;
using System.Collections;

public class SpriteAtlasTest : MonoBehaviour {

    private UISprite _sprite;
    public UIAtlas atlas;
    public UIAtlas atlas2;
    // Use this for initialization
    void Start () {
        _sprite = GetComponent<UISprite>();
    }
    
    // Update is called once per frame
    void Update () {
       

        if(Input.GetMouseButtonDown(0))
        {
            _sprite.atlas = atlas;
            _sprite.spriteName = "GoodDirt";
           
            
        }
        if(Input.GetMouseButtonDown(1))
        {
            _sprite.atlas = atlas2;
            _sprite.spriteName = "NGUI";
        }
    }
}