NGUI实现一个背包功能

using UnityEngine;
using System.Collections;

//ci此脚本挂在背景上
public class SknapBg : MonoBehaviour {

    public GameObject[] cells; //可捡起物品所能移动的框格。

    public GameObject obj;  //捡起的那个物品
    public string[] strName;  //能捡起的所有物品的图片名称

    private bool isHaveSprite=false; //这个框格是否有物品了

    //
    void Update()
    {
        if (Input.GetKeyDown (KeyCode.P)) {
            PickUP();        
        }
    }

    public void PickUP()
    {
        int index = Random.Range (0, strName.Length);
        string name = strName [index];

        //判断如果一个格子有物品，判断捡起的物品是否和他名字一样。
        for (int i = 0; i < cells.Length; i++) {
            if(cells[i].transform.childCount>0)
            {
             if(cells[i].GetComponentInChildren<Sknap>().obj.GetComponent<UISprite>().spriteName == name)
                {
                    cells[i].GetComponentInChildren<Sknap>().AddCount(1);
                    isHaveSprite=true;
                    break;
                }
            }
        }
                //在某个位置没有图片的时候才添加图片
                if (isHaveSprite == false) {
                        
                        for (int i=0; i<cells.Length; i++) {
                                if (cells [i].transform.childCount == 0) {
                                        GameObject go = NGUITools.AddChild (cells [i], obj); //NGUITools.AddChild
                                        go.GetComponent<UISprite> ().spriteName = name;
                                        go.transform.localPosition = Vector3.zero;
                                        break;
                                }                
                        }
                }
        }
}

using UnityEngine;
using System.Collections;

//挂在可捡起的物品上
public class Sknap :UIDragDropItem {
    protected override void OnDragDropRelease (GameObject surface)
    {
        base.OnDragDropRelease (surface);

        if (surface.tag == "Cell") {
                        this.transform.parent = surface.transform;
                        this.transform.localPosition = Vector3.zero;
                } else if (surface.tag == "Sknap") {
            Transform trans=surface.transform.parent;
            surface.transform.parent=this.transform.parent;
            surface.transform.localPosition=Vector3.zero;

            this.transform.parent=trans;
            this.transform.localPosition=Vector3.zero;
        }
    }

    public GameObject obj; 
    public UILabel label;
    private int count;

     public void AddCount(int num)
    {
        count += num;
        label.text = count.ToString ();
    }
}