4.unity UI ScrollRect 无限滚动条(最详细)

在游戏开发中经常遇到滚动显示的数据特别是商店商品排行榜 .......等数据很多，每一条数据去加载一个UI来显示显然对内存浪费很大，这种情况处理一般就是用几个显示条可滚动循环显示无限数据条。本篇介绍实现过程和大体思路以及可重用的滑动脚本InfinityGridLayoutGroup和MarketLayoutGroup数据管理刷新脚本。MarketElement类要看具体项目中具体数据结构来设计；仅供产考。

一 .总体流程：

建一个循环滑动脚本 InfinityGridLayoutGroup类并且有删除刷新功能;

一个数据管理刷新脚本如：MarketLayoutGroup(商店市场数据刷新管理器)，继承InfinityGridLayoutGroup类并且在滑动的时候给每条数据对象赋值显示；

一个单数据对象MarketElement;

一个UI 用于显示滑动；

1 .InfinityGridLayoutGroup类:

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System.Collections.Generic;[RequireComponent(typeof(GridLayoutGroup))]
[RequireComponent(typeof(ContentSizeFitter))]
public class InfinityGridLayoutGroup : MonoBehaviour
{public int minAmount = 0;//实现无限滚动，需要的最少的child数量。屏幕上能看到的+一行看不到的，比如我在屏幕上能看到 2 行，每一行 2 个。则这个值为 2行*2个 + 1 行* 2个 = 6个。  public bool changePanel = false;//切换面板public bool up = false;RectTransform rectTransform;GridLayoutGroup gridLayoutGroup;ContentSizeFitter contentSizeFitter;ScrollRect scrollRect;List<RectTransform> children = new List<RectTransform>();Vector2 startPosition;public int amount = 0;public delegate void UpdateChildrenCallbackDelegate(int index, Transform trans);public UpdateChildrenCallbackDelegate updateChildrenCallback = null;public int realIndex = -1;int realIndexUp = -1; //从下往上;  #region // 改动Vector2 gridLayoutSizeLast;Vector2 gridLayoutPosLast;Vector2 currentPos;#endregionpublic bool hasInit = false;Vector2 gridLayoutSize;Vector2 gridLayoutPos;Dictionary<Transform, Vector2> childsAnchoredPosition = new Dictionary<Transform, Vector2>();Dictionary<Transform, int> childsSiblingIndex = new Dictionary<Transform, int>();// Use this for initialization  void Start(){StartCoroutine(InitChildren());}IEnumerator InitChildren(){yield return 0;// Debug.Log("hasInit" + hasInit);minAmount = transform.childCount;if (!hasInit){//childsAnchoredPosition.Clear();//获取Grid的宽度;  rectTransform = GetComponent<RectTransform>();gridLayoutGroup = GetComponent<GridLayoutGroup>();gridLayoutGroup.enabled = false;contentSizeFitter = GetComponent<ContentSizeFitter>();contentSizeFitter.enabled = false;gridLayoutSizeLast = rectTransform.sizeDelta;gridLayoutPos = rectTransform.anchoredPosition;gridLayoutSize = rectTransform.sizeDelta;// Debug.Log("<Color=Red>children</Color>---" + children.Count + "realIndex---" + realIndex);//注册ScrollRect滚动回调;  scrollRect = transform.parent.GetComponent<ScrollRect>();scrollRect.onValueChanged.AddListener((data) => { ScrollCallback(data); });//获取所有child anchoredPosition 以及 SiblingIndex;  for (int index = 0; index < transform.childCount; index++){Transform child = transform.GetChild(index);RectTransform childRectTrans = child.GetComponent<RectTransform>();childsAnchoredPosition.Add(child, childRectTrans.anchoredPosition);childsSiblingIndex.Add(child, child.GetSiblingIndex());}//Debug.Log("<Color=Blue>children</Color>---" + children.Count + "realIndex---" + realIndex);}else{//Debug.Log("gridLayoutPosLast--" + gridLayoutSizeLast.y);rectTransform.anchoredPosition = new Vector2(gridLayoutPos.x, Vector2.zero.y);// Debug.Log("current--" + currentPos.y);rectTransform.sizeDelta = gridLayoutSize;gridLayoutSizeLast = rectTransform.sizeDelta;// Debug.Log("rectTransform.sizeDelta--" + rectTransform.sizeDelta.y);children.Clear();realIndex = -1;realIndexUp = -1;//children重新设置上下顺序;  foreach (var info in childsSiblingIndex){info.Key.SetSiblingIndex(info.Value);}//children重新设置anchoredPosition;  for (int index = 0; index < transform.childCount; index++){Transform child = transform.GetChild(index);RectTransform childRectTrans = child.GetComponent<RectTransform>();if (childsAnchoredPosition.ContainsKey(child)){childRectTrans.anchoredPosition = childsAnchoredPosition[child];}else{Debug.LogError("childsAnchoredPosition no contain " + child.name);}}}//获取所有child;  for (int index = 0; index < transform.childCount; index++){Transform trans = transform.GetChild(index);trans.gameObject.SetActive(true);children.Add(transform.GetChild(index).GetComponent<RectTransform>());//初始化前面几个;  UpdateChildrenCallback(children.Count - 1, transform.GetChild(index));}startPosition = rectTransform.anchoredPosition;// Debug.Log("<Color=Red>children</Color>---"+ children.Count+ "realIndex---"+ realIndex);realIndex = children.Count - 1;ShowElement(realIndex);//Debug.Log( scrollRect.transform.TransformPoint(Vector3.zero));  // Debug.Log(transform.TransformPoint(children[0].localPosition));  hasInit = true;//如果需要显示的个数小于设定的个数;  for (int index = 0; index < minAmount; index++){children[index].gameObject.SetActive(index < amount);}if (gridLayoutGroup.constraint == GridLayoutGroup.Constraint.FixedColumnCount){//如果小了一行，则需要把GridLayout的高度减去一行的高度;  int row = (minAmount - amount) / gridLayoutGroup.constraintCount;if (row > 0){rectTransform.sizeDelta -= new Vector2(0, (gridLayoutGroup.cellSize.y + gridLayoutGroup.spacing.y) * row);}}else{//如果小了一列，则需要把GridLayout的宽度减去一列的宽度;  int column = (minAmount - amount) / gridLayoutGroup.constraintCount;if (column > 0){rectTransform.sizeDelta -= new Vector2((gridLayoutGroup.cellSize.x + gridLayoutGroup.spacing.x) * column, 0);}}//if (amount <= minAmount)//    scrollRect.enabled = false;//else//    scrollRect.enabled = true;}void ScrollCallback(Vector2 data){UpdateChildren();}void UpdateChildren(){// Debug.Log("当前位置");if (transform.childCount < minAmount){return;}// Debug.Log("当前位置" + rectTransform.anchoredPosition.y + "startPosition.y" + startPosition.y);currentPos = rectTransform.anchoredPosition;//Vector2 currentPos = rectTransform.anchoredPosition;if (gridLayoutGroup.constraint == GridLayoutGroup.Constraint.FixedColumnCount){float offsetY = currentPos.y - startPosition.y;if (offsetY > 0){//向上拉，向下扩展;  {if (realIndex >= amount - 1){startPosition = currentPos;return;}up = false;float scrollRectUp = scrollRect.transform.TransformPoint(Vector3.zero).y;Vector3 childBottomLeft = new Vector3(children[0].anchoredPosition.x, children[0].anchoredPosition.y - gridLayoutGroup.spacing.y - gridLayoutGroup.cellSize.y * 0.5f, 0f); //gridLayoutGroup.cellSize.y float childBottom = transform.TransformPoint(childBottomLeft).y;if (childBottom >= scrollRectUp){Debug.Log("childBottom >= scrollRectUp");//移动到底部;  for (int index = 0; index < gridLayoutGroup.constraintCount; index++){children[index].SetAsLastSibling();children[index].anchoredPosition = new Vector2(children[index].anchoredPosition.x, children[children.Count - 1].anchoredPosition.y - gridLayoutGroup.cellSize.y - gridLayoutGroup.spacing.y);realIndex++;if (realIndex > amount - 1){children[index].gameObject.SetActive(false);}else{UpdateChildrenCallback(realIndex, children[index]);}}ShowElement(realIndex);//GridLayoutGroup 底部加长;  rectTransform.sizeDelta += new Vector2(0, gridLayoutGroup.cellSize.y + gridLayoutGroup.spacing.y);gridLayoutSizeLast = rectTransform.sizeDelta;// Debug.Log("<Color=Red>gridLayoutSizeLast.y</Color>" + gridLayoutSizeLast.y);//更新child;  for (int index = 0; index < children.Count; index++){children[index] = transform.GetChild(index).GetComponent<RectTransform>();}}// Debug.Log("realIndex向上--" + realIndex);}}else{//Debug.Log("Drag Down");  //向下拉，下面收缩;  if (realIndex + 1 <= children.Count){startPosition = currentPos;return;}RectTransform scrollRectTransform = scrollRect.GetComponent<RectTransform>();Vector3 scrollRectAnchorBottom = new Vector3(0, -scrollRectTransform.rect.height - gridLayoutGroup.spacing.y, 0f);//- gridLayoutGroup.spacing.yfloat scrollRectBottom = scrollRect.transform.TransformPoint(scrollRectAnchorBottom).y;Vector3 childUpLeft = new Vector3(children[children.Count - 1].anchoredPosition.x, children[children.Count - 1].anchoredPosition.y + gridLayoutGroup.spacing.y * minAmount, 0f);//gridLayoutGroup.spacing.y realIndex-minAmount+1float childUp = transform.TransformPoint(childUpLeft).y;//Debug.Log("childUp----" + childUp + "scrollRectBottom---" + scrollRectBottom);if (childUp < scrollRectBottom){//Debug.Log("childUp < scrollRectBottom");  up = true;//把底部的一行 移动到顶部  for (int index = 0; index < gridLayoutGroup.constraintCount; index++){children[children.Count - 1 - index].SetAsFirstSibling();children[children.Count - 1 - index].anchoredPosition = new Vector2(children[children.Count - 1 - index].anchoredPosition.x, children[0].anchoredPosition.y + gridLayoutGroup.cellSize.y + gridLayoutGroup.spacing.y);children[children.Count - 1 - index].gameObject.SetActive(true);UpdateChildrenCallback(realIndex - children.Count - index, children[children.Count - 1 - index]);}realIndex -= gridLayoutGroup.constraintCount;ShowElement(realIndex);//GridLayoutGroup 底部缩短;  //rectTransform.anchoredPosition = gridLayoutPos;rectTransform.sizeDelta -= new Vector2(0, gridLayoutGroup.cellSize.y + gridLayoutGroup.spacing.y);gridLayoutSizeLast = rectTransform.sizeDelta;//Debug.Log("<Color=Red>gridLayoutSizeLast.y</Color>" + gridLayoutSizeLast.y);//更新child;  for (int index = 0; index < children.Count; index++){children[index] = transform.GetChild(index).GetComponent<RectTransform>();}}// Debug.Log("realIndex向下--" + realIndex);}}#region 左右滑动else{float offsetX = currentPos.x - startPosition.x;if (offsetX < 0){//向左拉，向右扩展;  {if (realIndex >= amount - 1){startPosition = currentPos;return;}float scrollRectLeft = scrollRect.transform.TransformPoint(Vector3.zero).x;Vector3 childBottomRight = new Vector3(children[0].anchoredPosition.x + gridLayoutGroup.cellSize.x, children[0].anchoredPosition.y, 0f);float childRight = transform.TransformPoint(childBottomRight).x;// Debug.LogError("childRight=" + childRight);  if (childRight <= scrollRectLeft){//Debug.Log("childRight <= scrollRectLeft");  //移动到右边;  for (int index = 0; index < gridLayoutGroup.constraintCount; index++){children[index].SetAsLastSibling();children[index].anchoredPosition = new Vector2(children[children.Count - 1].anchoredPosition.x + gridLayoutGroup.cellSize.x + gridLayoutGroup.spacing.x, children[index].anchoredPosition.y);realIndex++;if (realIndex > amount - 1){children[index].gameObject.SetActive(false);}else{UpdateChildrenCallback(realIndex, children[index]);}}if (realIndex >= 7)//GridLayoutGroup 右侧加长;  rectTransform.sizeDelta += new Vector2(gridLayoutGroup.cellSize.x + gridLayoutGroup.spacing.x, 0);//更新child;  for (int index = 0; index < children.Count; index++){children[index] = transform.GetChild(index).GetComponent<RectTransform>();}}}}else{//Debug.Log("Drag Down");  //向右拉，右边收缩;  if (realIndex + 1 <= children.Count){startPosition = currentPos;return;}RectTransform scrollRectTransform = scrollRect.GetComponent<RectTransform>();Vector3 scrollRectAnchorRight = new Vector3(scrollRectTransform.rect.width + gridLayoutGroup.spacing.x, 0, 0f);float scrollRectRight = scrollRect.transform.TransformPoint(scrollRectAnchorRight).x;Vector3 childUpLeft = new Vector3(children[children.Count - 1].anchoredPosition.x, children[children.Count - 1].anchoredPosition.y, 0f);float childLeft = transform.TransformPoint(childUpLeft).x;if (childLeft >= scrollRectRight){//Debug.LogError("childLeft > scrollRectRight");  //把右边的一行 移动到左边;  for (int index = 0; index < gridLayoutGroup.constraintCount; index++){children[children.Count - 1 - index].SetAsFirstSibling();children[children.Count - 1 - index].anchoredPosition = new Vector2(children[0].anchoredPosition.x - gridLayoutGroup.cellSize.x - gridLayoutGroup.spacing.x, children[children.Count - 1 - index].anchoredPosition.y);children[children.Count - 1 - index].gameObject.SetActive(true);UpdateChildrenCallback(realIndex - children.Count - index, children[children.Count - 1 - index]);}//GridLayoutGroup 右侧缩短;  rectTransform.sizeDelta -= new Vector2(gridLayoutGroup.cellSize.x + gridLayoutGroup.spacing.x, 0);//更新child;  for (int index = 0; index < children.Count; index++){children[index] = transform.GetChild(index).GetComponent<RectTransform>();}realIndex -= gridLayoutGroup.constraintCount;}#endregion}}// Debug.Log("realIndex--" + realIndex);//Debug.Log("currentPos.y--" + currentPos.y + "rectTransform.sizeDelta---" + rectTransform.sizeDelta.y);startPosition = currentPos;gridLayoutPosLast = currentPos;}void UpdateChildrenCallback(int index, Transform trans){if (updateChildrenCallback != null){updateChildrenCallback(index, trans);}}public virtual void ShowElement(int endIndex){}/// <summary>  /// 设置总的个数;  /// </summary>  /// <param name="count"></param>  public void SetAmount(int count){amount = count;//如果切换面板if (!changePanel){//hasInit = false;StartCoroutine(InitChildren());changePanel = true;}else{// Debug.Log("currentPos.y--" + currentPos.y);if (currentPos.y > 10){如果需要显示的个数小于设定的个数;  //Debug.Log("minAmount--"+minAmount);for (int index = 0; index < minAmount; index++){children[index].gameObject.SetActive(index < amount);}//删除操作 if (GameInstance.isDecrase){if (realIndex > minAmount - 1){realIndex--;//把底部的一行 移动到顶部  for (int index = 0; index < gridLayoutGroup.constraintCount; index++){children[children.Count - 1 - index].SetAsFirstSibling();children[children.Count - 1 - index].anchoredPosition = new Vector2(children[children.Count - 1 - index].anchoredPosition.x, children[0].anchoredPosition.y + gridLayoutGroup.cellSize.y + gridLayoutGroup.spacing.y);children[children.Count - 1 - index].gameObject.SetActive(true);UpdateChildrenCallback(realIndex - children.Count - index, children[children.Count - 1 - index]);}//更新child;  for (int index = 0; index < children.Count; index++){children[index] = transform.GetChild(index).GetComponent<RectTransform>();}}GameInstance.isDecrase = false;//GameInstance类中bool变量控制条目删除的刷新使用currentPos = new Vector2(currentPos.x, currentPos.y - gridLayoutGroup.cellSize.y - gridLayoutGroup.spacing.y);if (realIndex > minAmount - 1){gridLayoutSizeLast = new Vector2(gridLayoutSizeLast.x, gridLayoutSizeLast.y - gridLayoutGroup.cellSize.y - gridLayoutGroup.spacing.y);}elserectTransform.anchoredPosition = currentPos;}elserectTransform.anchoredPosition = currentPos;rectTransform.sizeDelta = gridLayoutSizeLast;rectTransform.anchoredPosition = new Vector2(currentPos.x, currentPos.y);startPosition = rectTransform.anchoredPosition;ShowElement(realIndex);}else{StartCoroutine(InitChildren());}}}
}

2.MarketLayoutGroup类：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class MarketLayoutGroup : InfinityGridLayoutGroup
{bool isNotOutRange = false;//商店市场的可买的商品集合private List<MarketGood> marketGoods;//可出售到商店的商品集合public List<SealGood> marketSeal;//可要在商店加工的商品集合private List<ExchangeGood> marketMake;//重写父类的调用循环刷新显示public override void ShowElement(int endIndex){//获取商店窗体对象MarketActivity market = MainPanelContrller.Instance.presenter.MarketWindowsActivity[0] as MarketActivity;//判断当前窗体默认开启的类型是否是可买的商品集合if (market.current == CurrentPanel.Image_Buy){//获取可买商品的数据（ GameInstance全局数据储存脚本）marketGoods = GameInstance.marketGoods;//判断商品数amount = marketGoods.Count;//Debug.Log ("marketGoods--"+marketGoods.Count);//endIndex为可见ui的最大下标isNotOutRange = endIndex < marketGoods.Count ? true : false;//遍历ui对象数目 判断每一条ui应该显示的数据 并调用MarketElement赋值显示。for (int i = 0; i < transform.childCount; i++){//获取ui显示对象MarketElement presenter = transform.GetChild(i).GetComponent<MarketElement>();//判断并且赋值显示if (isNotOutRange){//presenter.name.text = myGoodList[endIndex - minAmount + 1 + i].name;presenter.SetData(marketGoods[endIndex - minAmount + 1 + i]);}else{if (endIndex - minAmount + 1 + i < marketGoods.Count){presenter.SetData(marketGoods[endIndex - minAmount + 1 + i]);}else{MarketGood good = new MarketGood();presenter.SetData(good);}}}}else if (market.current == CurrentPanel.Image_Seal){if (GameInstance.marketSeals == null)return;//Debug.Log("GameInstance.marketSeals" + GameInstance.marketSeals.Count);// Debug.Log("marketSeal" + marketSeal);marketSeal = GameInstance.marketSeals;amount = marketSeal.Count;isNotOutRange = endIndex < marketSeal.Count ? true : false;for (int i = 0; i < transform.childCount; i++){ElementSeal presenter = transform.GetChild(i).GetComponent<ElementSeal>();if (isNotOutRange){//Debug.Log("endIndex+" + endIndex);//Debug.Log(endIndex - minAmount + 1 + i);//presenter.name.text = myGoodList[endIndex - minAmount + 1 + i].name;presenter.SetData(marketSeal[endIndex - minAmount + 1 + i]);}else{// Debug.Log(endIndex - minAmount + 1 + i);if (endIndex - minAmount + 1 + i < marketSeal.Count){presenter.SetData(marketSeal[endIndex - minAmount + 1 + i]);}else{SealGood _good = new SealGood();presenter.SetData(_good);}}}}else{//Debug.Log("当前所在条数--" + realIndex);//加工marketMake = GameInstance.marketMakes;amount = marketMake.Count;isNotOutRange = endIndex < marketMake.Count ? true : false;for (int i = 0; i < transform.childCount; i++){MarketElement presenter = transform.GetChild(i).GetComponent<MarketElement>();if (isNotOutRange){//presenter.name.text = myGoodList[endIndex - minAmount + 1 + i].name;presenter.SetData(marketMake[endIndex - minAmount + 1 + i]);}else{//Debug.Log ("marketGoods---"+marketGoods);if (endIndex - minAmount + 1 + i < marketMake.Count){presenter.SetData(marketMake[endIndex - minAmount + 1 + i]);}else{ExchangeGood good = new ExchangeGood();presenter.SetData(good);}}}}}
}

3.UI对象父类MarketElement：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MarketElement : MonoBehaviour
{
public virtual void SetData(ExchangeGood good) { }
public virtual void SetData(MarketGood good) { }
public virtual void SetData(SealGood good) { }
public virtual void SetData() { }

}

实现类：ElementMarket

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;public class ElementMarket : MarketElement
{private MarketGood _goodData;[Header("物品框父物体")]public Image good_BG;public Text price;public Text num;public Text name;public Text nameGoods;public Button buy;LocalizeData xml_data = new LocalizeData();string config = LocalizeManager.Instance.GetCurrentLanguage();public override void SetData(MarketGood good){base.SetData(good);if (good.goodsId == 0) return;_goodData = good;if (MainPanelContrller.Instance.openStyle == OpenMarketStyle.Skill){GoodsInfoData myGood = new GoodsInfoData();GameManager.Instance.allXmlData.GetXmlData<GoodsInfoData>(ConfigFilesName.GOODS_CONFIG, good.goodsId, ref myGood);good_BG.transform.GetChild(0).GetComponent<Image>().sprite = SpriteManager.LoadAtlasSprite("Sprite/Item", "Item_" + myGood.Icon);price.text = "x" + good.price.ToString();nameGoods.text = myGood.Name;// num.text = "x" + good.num;// int trend = good.price - good.lastPrice;//使用描述name.text = myGood.Description;//物品描述num.text = myGood.Description_2;}else{//员外的}}void OnEnable(){buy.onClick.AddListener(BuyBtn);}void OnDisable(){buy.onClick.RemoveAllListeners();}/// <summary>/// 打开购买二级界面 /// </summary>void BuyBtn(){Debug.Log("购买了资源商店：" + _goodData.goodsId + " 物品");this.gameObject.transform.parent.GetComponent<MarketLayoutGroup>().changePanel = true;Bundle bundle = new Bundle();bundle.PutObject("marketGood", _goodData);MainPanelContrller.Instance.presenter.MarketWindowsActivity[0].manager.PushWindow(typeof(BuyActivity), bundle);}}

4.UI:

滑动总UI scrollrect

滑动组件Grid MarketLayerGourp

滑动条 ElementMarket:

Ok 介绍到这里：ElementMarket 根据具体项目的数据进行调整，其他两项都可以重用。

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