Unity UI组件ScrollRect实现无限滚动条

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Unity UI组件ScrollRect实现无限滚动条

这篇文章主要为大家详细介绍了Unity UI组件ScrollRect实现无限滚动条，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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；仅供参考。

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:

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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;

#endregion

public 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.y

float 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+1

float 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].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);

}

else

rectTransform.anchoredPosition = currentPos;

}

else

rectTransform.anchoredPosition = currentPos;

rectTransform.sizeDelta = gridLayoutSizeLast;

rectTransform.anchoredPosition = new Vector2(currentPos.x, currentPos.y);

startPosition = rectTransform.anchoredPosition;

ShowElement(realIndex);

}

else

{

StartCoroutine(InitChildren());

}

2.MarketLayoutGroup类：

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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。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

原文链接：https://blog.csdn.net/s_xiajunjun1986/article/details/101016219

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