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using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;public class BagItem : MonoBehaviour{
       public Text count;        public  void InitItem(Item item)    {
           count.text = item.Count.ToString();    }    }

using System.Collections;using System.Collections.Generic;using UnityEngine;public class Item{
       public int ID {
    get; set; }    public int Count {
    get; set; }}public class BagMgr : BaseManager
   
    {
      public List
    
      items=new List
     
      ();    public  void InitItems(int count)    {
           for (int i = 0; i < count; i++)        {
               Item item=new Item(){
   ID = i,Count = i};            items.Add(item);        }    }}
     
    
   

using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;public class BagPanel : MonoBehaviour{
       public RectTransform content;    public ScrollRect scrollRect;    public int viewPortH; //可视范围的高    public int gridHigh;    public int intervalx;    public int intervaly;    public int xcount = 3; //横着多少格子    private int oldMinIndex = -1;    private int oldMaxIndex = -1;    private Dictionary
   
     nowShowItem=new Dictionary
    
     ();    void Start()    {
           content.sizeDelta=new Vector2(0, 10000/3*(gridHigh+intervaly));        scrollRect.onValueChanged.AddListener((value) => {
    Change(value); });    }    public void Change(Vector2 value)    {
           //起始位置        int minIndex = (int)content.anchoredPosition.y / (gridHigh+ intervaly)*3;        //结束位置        int maxIndex = ((int)content.anchoredPosition.y+viewPortH) / (gridHigh + intervaly) * 3+2;        //移除上一次不在视野范围内的物品        for (int i = oldMinIndex; i < minIndex; i++)        {
               if (nowShowItem.ContainsKey(i))            {
                   PoolMgr.GetInstance.Push(nowShowItem[i].transform.name, nowShowItem[i].transform);                nowShowItem.Remove(i);            }        }        for (int i = maxIndex; i <=oldMaxIndex; i++)        {
               if (nowShowItem.ContainsKey(i))            {
                   PoolMgr.GetInstance.Push(nowShowItem[i].transform.name, nowShowItem[i].transform);                nowShowItem.Remove(i);            }        }        oldMinIndex = minIndex;        oldMaxIndex= maxIndex;        //创建可视范围内的item        for (int i = minIndex; i <=maxIndex; i++)        {
               if (nowShowItem.ContainsKey(i))            {
                   continue;            }            else            {
                   Transform item = PoolMgr.GetInstance.GetObjByInput();                item.SetParent(content, false);                item.GetComponent
     
      ().InitItem(BagMgr.GetInstance.items[i]);                //设置位置                item.localPosition = new Vector3(i % xcount * (gridHigh + intervalx), -i / 3 * (gridHigh + intervaly), 0);                nowShowItem.Add(i,item);            }        }    }}
     
    
   

using System.Collections;using System.Collections.Generic;using UnityEngine;/// 
///不继承mono的单利基类/// 
/// 
   public class BaseManager
   
     where T : class, new(){
       private static T _instance;    public static T GetInstance    {
           get        {
               if (_instance == null)            {
                   _instance = new T();            }            return _instance;        }    }}/// 
    
/// 继承mono的单利基类/// 
/// 
    public class BaseManagerMono
    
      : MonoBehaviour where T : MonoBehaviour{
       private static T _instance;    public static T GetInstance    {
           get        {
               if (_instance == null)            {
                   _instance = GameObject.FindObjectOfType
     
      ();            }            return _instance;        }    }}
     
    
   

using System.Collections;using System.Collections.Generic;using UnityEngine;public class GameManager : MonoBehaviour{
       public BagPanel BagPanel;    void Start()    {
           PoolMgr.GetInstance.Init();        BagMgr.GetInstance.InitItems(10000);        PoolMgr.GetInstance.GetObj("BagItem");        BagPanel.Change(Vector2.zero);    }    void Update()    {
           if (Input.GetKeyDown(KeyCode.K))        {
               PoolMgr.GetInstance.GetObjByInput().SetParent(transform,false);        }    }}

using System.Collections;using System.Collections.Generic;using UnityEngine;public class HideSelf : MonoBehaviour{
      }

using System;using System.Collections;using System.Collections.Generic;using UnityEngine;public enum ObjType{
       BagItem,    Bullet,    Fire,    Hole,}public class Pool{
       private Transform parent;    private ObjType type;    private Queue
   
     queues;    private Type[] types;    public Pool(string poolName, Transform parent, ObjType type, params Type[] types)    {
           GameObject game = new GameObject(poolName);        game.transform.SetParent(parent);        this.parent = game.transform;        queues = new Queue
    
     ();        this.type = type;        this.types = types;    }    public Transform GetObj()    {
           if (queues.Count > 0)        {
               return queues.Dequeue();        }        else        {
               return SpawnNew();        }    }    public void Push(Transform obj)    {
           obj.SetParent(parent);        queues.Enqueue(obj);    }    private Transform SpawnNew()    {
           GameObject item = UnityEngine.Object.Instantiate(Resources.Load
     
      (type.ToString())).gameObject;        item.name = parent.gameObject.name;        foreach (Type type in types)        {
               item.AddComponent(type);        }        //if (item.transform.parent!=null)        //{
           //    item.transform.parent = null;        //}        return item.transform;    }}
     
    
   

using System;using System.Collections;using System.Collections.Generic;using UnityEngine;/// 
/// 对象池管理类/// 
public class PoolMgr : BaseManager
   
    {
       private Transform poolParent;    private Dictionary
    
      pools;    public void Init()    {
           GameObject game = new GameObject("Pools");        game.SetActive(false);        poolParent = game.transform;        pools = new Dictionary
     
      ();        string[] objNames = Enum.GetNames(typeof(ObjType));        for (int i = 0; i < objNames.Length; i++)        {
               pools.Add(objNames[i], new Pool(objNames[i], poolParent, (ObjType)Enum.Parse(typeof(ObjType), objNames[i]), typeof(HideSelf)));        }    }    public Transform GetObjByInput()    {
           string[] objNames = Enum.GetNames(typeof(ObjType));        string name = objNames[0];        return GetObj(name);    }    public Transform GetObj(string name)    {
           if (pools.ContainsKey(name))        {
               Transform obj = pools[name].GetObj();            obj.parent = null;            return obj;        }        else        {
               Debug.Log("不包含这个key:" + name);            return null;        }    }    public void Push(string name, Transform obj)    {
           if (pools.ContainsKey(name))        {
               pools[name].Push(obj);        }        else        {
               Debug.Log("不包含这个key:" + name);        }    }}
     
    
   

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