using UnityEngine;using System.Collections;public enum BoxType{    Normal,//普通格子    Equip//装备栏格子}    public enum EquipType{    Weapon,//武器    Armor,//护甲    Shoot//鞋子}public class Box : MonoBehaviour {    //格子类型    public BoxType boxType;    //装备类型    public EquipType equipType;    //格子的子对象（一些装备）    public Transform child;    void Start()    {        //给子对象赋值        if (transform.childCount == 1) {            child = transform.GetChild (0);        }    }    /// 
    /// 接收物品    /// 
    /// Goods.    public void ReceiveGoods(Goods goods)    {        //普通格子//        if (boxType == BoxType.Normal) {//            BagSingleton.instance.SetParent (goods.transform, transform);//        } else {//            //如果装备类型匹配//            if (goods.goodsType == equipType) {//                BagSingleton.instance.SetParent (goods.transform, transform);//            } else {//                //不匹配返回//                goods.ReturnBack ();//            }//        }        //优化版        if (boxType == BoxType.Equip && goods.goodsType != equipType) {            goods.ReturnBack ();        } else {            BagSingleton.instance.SetParent (goods.transform, transform);            //更新物品的父物体            goods.parent = transform;            //更新格子的子物体            child = goods.transform;        }    }}

using UnityEngine;using System.Collections;using UnityEngine.UI;using UnityEngine.EventSystems;public class Goods : MonoBehaviour,IBeginDragHandler,IDragHandler,IEndDragHandler {    //物品类型    public EquipType goodsType;    //父对象（格子）    public Transform parent;    private CanvasGroup canvasGroup;    void Start()    {        //给父对象赋值        if (transform.parent) {            parent = transform.parent;        }        //获取        canvasGroup = GetComponent
     
       ();    }    public void OnBeginDrag (PointerEventData eventData)    {        //将物品移除格子        transform.SetParent (BagSingleton.instance.bag);        //关闭阻挡射线        canvasGroup.blocksRaycasts = false;    }    public void OnDrag (PointerEventData eventData)    {        transform.position = Input.mousePosition;    }    public void OnEndDrag (PointerEventData eventData)    {        //如果当前物品下方有对象        if (eventData.pointerEnter) {            //获取底层对象标签            string tag = eventData.pointerEnter.tag;            //如果是格子            if (tag == "Box") {                //接收物品                eventData.pointerEnter.                    GetComponent
      
        ().ReceiveGoods (this);            }            //如果是物品            else if (tag == "Goods") {                //下面物品                Goods herGoods = eventData.pointerEnter.GetComponent
       
         ();                //下面物品所在格子                Box herBox = herGoods.parent.GetComponent
        
         ();                //当前物品                Goods myGoods = this;                //当前物品所在格子                Box myBox = parent.GetComponent
         
          ();                //交换                BagSingleton.instance.GoodsExchange (myBox, myGoods, herBox, herGoods);            }            //其他            else {                //返回                ReturnBack ();            }        } else {            //返回            ReturnBack ();        }        //开启阻挡射线        canvasGroup.blocksRaycasts = true;    }    /// 
          
 /// 返回原单位 /// 
    public void ReturnBack()    {        BagSingleton.instance.SetParent (transform, parent);    }}
         
        
       
      
     

using UnityEngine;using System.Collections;public class BagSingleton : MonoBehaviour {    //单例    public static BagSingleton instance;    //背包    public Transform bag;    void Start()    {        instance = this;        bag = GameObject.FindWithTag ("Bag").transform;    }    /// 
    /// 设置格子父物体，并与父物体位置保持同步    /// 
    /// Parent.    public void SetParent(Transform son ,Transform parent)    {        son.SetParent (parent);        son.localPosition = Vector3.zero;    }    /// 
    /// 物品交换    /// 
    /// My box.    /// My goods.    /// Her box.    /// Her goods.    public void GoodsExchange(Box myBox,Goods myGoods,Box herBox,Goods herGoods)    {        //如果双方都在普通格子中，或，双方物品类型一致        if ((myBox.boxType == BoxType.Normal &&            herBox.boxType == BoxType.Normal)            || (myGoods.goodsType == herGoods.goodsType)) {            myBox.ReceiveGoods (herGoods);            herBox.ReceiveGoods (myGoods);        } else {            //当前物品返回原单位            myGoods.ReturnBack ();        }    }}

BagSingleton是Box跟goods两个脚本会引用的单例脚本判断物品切换