本文共 11648 字，大约阅读时间需要 38 分钟。

直接上效果

脚本UGUIWrapContent.cs

/// 
/// 循环利用列表子项/// Author: LXF/// 
using UnityEngine;using System.Collections;using UnityEngine.UI;using System.Collections.Generic;[RequireComponent(typeof(GridLayoutGroup))]public class UGUIWrapContent : MonoBehaviour{    protected void Awake()    {        m_hasInit = false;        m_realChildObjCnt = 0;        m_realIndex = -1;        m_realIndexUp = -1;        m_selfTrans = transform;        m_childsAnchoredPos = new Dictionary
   
    ();        m_childsSiblingIndex = new Dictionary
    
     ();        m_childrenRectTransList = new List
     
      ();    }    IEnumerator InitChildren()    {        yield return 0;        bool needReDraw = false;        if (!m_hasInit)        {            FirstTimeInit();            needReDraw = true;        }        else        {            bool needReLocate = false;            if (m_realChildObjCnt >= m_dataChildCnt)            {                needReDraw = true;                needReLocate = true;            }            if (needReLocate)            {                ResetChildrenPos();            }        }        if (needReDraw)        {            ReDrawChildren();        }    }    private void FirstTimeInit()    {        //获取Grid的宽度;        m_rectTrans = GetComponent
      
       ();        m_gridLayoutGroup = GetComponent
       
        ();        m_gridLayoutGroup.enabled = false;        m_gridLayoutPos = m_rectTrans.anchoredPosition;        m_gridLayoutSize = m_rectTrans.sizeDelta;        //注册ScrollRect滚动回调;        if (null != m_scrollRect)            m_scrollRect.onValueChanged.AddListener((data) => { ScrollCallback(data); });        else            Debug.LogError("null == ScrollRect,请给脚本的ScrollRect赋值");        m_realChildObjCnt = m_selfTrans.childCount;        //获取所有child anchoredPosition 以及 SiblingIndex;        for (int index = 0, cnt = m_selfTrans.childCount; index < cnt; index++)        {            Transform child = m_selfTrans.GetChild(index);            RectTransform childRectTrans = child.GetComponent
        
         (); m_childsAnchoredPos.Add(child, childRectTrans.anchoredPosition); m_childsSiblingIndex.Add(child, child.GetSiblingIndex()); } } private void ResetChildrenPos() { m_rectTrans.anchoredPosition = m_gridLayoutPos; m_rectTrans.sizeDelta = m_gridLayoutSize; m_childrenRectTransList.Clear(); m_realIndex = -1; m_realIndexUp = -1; //children重新设置上下顺序; foreach (var info in m_childsSiblingIndex) { info.Key.SetSiblingIndex(info.Value); } //children重新设置anchoredPosition; for (int index = 0; index < m_selfTrans.childCount; index++) { Transform child = m_selfTrans.GetChild(index); RectTransform childRectTrans = child.GetComponent
         
          (); if (m_childsAnchoredPos.ContainsKey(child)) { childRectTrans.anchoredPosition = m_childsAnchoredPos[child]; } else { Debug.LogError("childsAnchoredPosition no contain " + child.name); } } } private void ReDrawChildren() { //获取所有child; for (int index = 0; index < m_selfTrans.childCount; index++) { Transform trans = m_selfTrans.GetChild(index); trans.gameObject.SetActive(true); m_childrenRectTransList.Add(m_selfTrans.GetChild(index).GetComponent
          
           ()); //初始化前面几个; UpdateChildrenCallback(m_childrenRectTransList.Count - 1, m_selfTrans.GetChild(index)); } m_startPos = m_rectTrans.anchoredPosition; m_realIndex = m_childrenRectTransList.Count - 1; m_hasInit = true; //如果需要显示的个数小于设定的个数; for (int index = 0; index < m_realChildObjCnt; index++) { m_childrenRectTransList[index].gameObject.SetActive(index < m_dataChildCnt); } if (m_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 = m_realChildObjCnt - m_dataChildCnt; if (row > 0) { m_rectTrans.sizeDelta -= new Vector2(0, (m_gridLayoutGroup.cellSize.y + m_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 = m_realChildObjCnt - m_dataChildCnt; if (column > 0) { m_rectTrans.sizeDelta -= new Vector2((m_gridLayoutGroup.cellSize.x + m_gridLayoutGroup.spacing.x) * column, 0); } } } void ScrollCallback(Vector2 data) { UpdateChildren(); } void UpdateChildren() { if (m_selfTrans.childCount < m_realChildObjCnt) { return; } Vector2 currentPos = m_rectTrans.anchoredPosition; if (m_gridLayoutGroup.constraint == GridLayoutGroup.Constraint.FixedColumnCount) { float offsetY = currentPos.y - m_startPos.y; if (offsetY > 0) { if (!OnMoveUp(currentPos)) return; } else { //向下拉，下面收缩; if (!OnMoveDown(currentPos)) return; } } else { float offsetX = currentPos.x - m_startPos.x; if (offsetX < 0) { //向左拉，向右扩展; if (!OnMoveLeft(currentPos)) return; } else { //向右拉，右边收缩; if (!OnMoveRight(currentPos)) return; } } m_startPos = currentPos; } private bool OnMoveUp(Vector2 currentPos) { //向上拉，向下扩展; if (m_realIndex >= m_dataChildCnt - 1) { m_startPos = currentPos; return false; } float scrollRectUp = m_scrollRect.transform.TransformPoint(Vector3.zero).y; var topChild = m_childrenRectTransList[0]; var bottomChild = m_childrenRectTransList[m_childrenRectTransList.Count - 1]; Vector3 childBottomLeft = new Vector3(topChild.anchoredPosition.x, topChild.anchoredPosition.y - m_gridLayoutGroup.cellSize.y, 0f); float childBottom = m_selfTrans.TransformPoint(childBottomLeft).y; if (childBottom >= scrollRectUp) { //移动到底部// topChild.SetAsLastSibling(); var posY = bottomChild.anchoredPosition.y - m_gridLayoutGroup.cellSize.y - m_gridLayoutGroup.spacing.y; topChild.anchoredPosition = new Vector2(topChild.anchoredPosition.x, posY); m_realIndex++; if (m_realIndex > m_dataChildCnt - 1) { topChild.gameObject.SetActive(false); } else { UpdateChildrenCallback(m_realIndex, topChild); } //GridLayoutGroup 底部加长; m_rectTrans.sizeDelta += new Vector2(0, m_gridLayoutGroup.cellSize.y + m_gridLayoutGroup.spacing.y); //更新child; RetTagChildren(); } return true; } private bool OnMoveDown(Vector2 currentPos) { if (m_realIndex + 1 <= m_childrenRectTransList.Count) { m_startPos = currentPos; return false; } RectTransform scrollRectTransform = m_scrollRect.GetComponent
           
            (); Vector3 scrollRectAnchorBottom = new Vector3(0, -scrollRectTransform.rect.height - m_gridLayoutGroup.spacing.y, 0f); float scrollRectBottom = m_scrollRect.transform.TransformPoint(scrollRectAnchorBottom).y; var lastChild = m_childrenRectTransList[m_childrenRectTransList.Count - 1]; Vector2 childUpLeft = lastChild.anchoredPosition + new Vector2(0, m_gridLayoutGroup.cellSize.y); float childUp = m_selfTrans.TransformPoint(childUpLeft).y; if (childUp < scrollRectBottom) { //把底部的一行 移动到顶部 var childCnt = m_childrenRectTransList.Count; var bottomChild = m_childrenRectTransList[childCnt - 1]; var topChild = m_childrenRectTransList[0]; bottomChild.SetAsFirstSibling(); var posY = topChild.anchoredPosition.y + m_gridLayoutGroup.cellSize.y + m_gridLayoutGroup.spacing.y; bottomChild.anchoredPosition = new Vector2(bottomChild.anchoredPosition.x, posY); bottomChild.gameObject.SetActive(true); UpdateChildrenCallback(m_realIndex - childCnt, bottomChild); --m_realIndex; //GridLayoutGroup 底部缩短; m_rectTrans.sizeDelta -= new Vector2(0, m_gridLayoutGroup.cellSize.y + m_gridLayoutGroup.spacing.y); //更新child; RetTagChildren(); } return true; } private bool OnMoveLeft(Vector2 currentPos) { if (m_realIndex >= m_dataChildCnt - 1) { m_startPos = currentPos; return false; } float scrollRectLeft = m_scrollRect.transform.TransformPoint(Vector3.zero).x; var leftestChild = m_childrenRectTransList[0]; var leftestChildPos = leftestChild.anchoredPosition; var rightestChild = m_childrenRectTransList[m_childrenRectTransList.Count - 1]; Vector3 childBottomRight = new Vector3(leftestChildPos.x + m_gridLayoutGroup.cellSize.x, leftestChildPos.y, 0f); float childRight = m_selfTrans.TransformPoint(childBottomRight).x; if (childRight <= scrollRectLeft) { //移动到右边; leftestChild.SetAsLastSibling(); var posX = rightestChild.anchoredPosition.x + m_gridLayoutGroup.cellSize.x + m_gridLayoutGroup.spacing.x; leftestChild.anchoredPosition = new Vector2(posX, leftestChildPos.y); m_realIndex++; if (m_realIndex > m_dataChildCnt - 1) { leftestChild.gameObject.SetActive(false); } else { UpdateChildrenCallback(m_realIndex, m_childrenRectTransList[0]); } //GridLayoutGroup 右侧加长; m_rectTrans.sizeDelta += new Vector2(m_gridLayoutGroup.cellSize.x + m_gridLayoutGroup.spacing.x, 0); //更新child; RetTagChildren(); } return true; } private bool OnMoveRight(Vector2 currentPos) { if (m_realIndex + 1 <= m_childrenRectTransList.Count) { m_startPos = currentPos; return false; } var rightestChild = m_childrenRectTransList[m_childrenRectTransList.Count - 1]; var rightestChildPos = rightestChild.anchoredPosition; var leftestChild = m_childrenRectTransList[0]; RectTransform scrollRectTransform = m_scrollRect.GetComponent
            
             (); Vector3 scrollRectAnchorRight = new Vector3(scrollRectTransform.rect.width + m_gridLayoutGroup.spacing.x, 0, 0f); float scrollRectRight = m_scrollRect.transform.TransformPoint(scrollRectAnchorRight).x; Vector2 childUpLeft = rightestChildPos - new Vector2(m_gridLayoutGroup.cellSize.x, 0); float childLeft = m_selfTrans.TransformPoint(childUpLeft).x; if (childLeft >= scrollRectRight) { //把右边的一行 移动到左边; rightestChild.SetAsFirstSibling(); var posX = leftestChild.anchoredPosition.x - m_gridLayoutGroup.cellSize.x - m_gridLayoutGroup.spacing.x; rightestChild.anchoredPosition = new Vector2(posX, rightestChildPos.y); rightestChild.gameObject.SetActive(true); UpdateChildrenCallback(m_realIndex - m_childrenRectTransList.Count, rightestChild); --m_realIndex; //GridLayoutGroup 右侧缩短; m_rectTrans.sizeDelta -= new Vector2(m_gridLayoutGroup.cellSize.x + m_gridLayoutGroup.spacing.x, 0); //更新child; RetTagChildren(); } return true; } private void RetTagChildren() { for (int index = 0, cnt = m_childrenRectTransList.Count; index < cnt; ++index) { var child = m_selfTrans.GetChild(index); m_childrenRectTransList[index] = child.GetComponent
             
              (); } } void UpdateChildrenCallback(int index, Transform trans) { if (updateChildrenCallback != null) { updateChildrenCallback(index, trans); } } /// 
              
 /// 设置总的个数; /// 
 /// 
               public void SetAmount(int count) { m_dataChildCnt = count; StartCoroutine(InitChildren()); } /// 
              
 /// 是否初始化过 /// 
 private bool m_hasInit = false; /// 
              
 /// 实际的子项Obj数量 /// 
 private int m_realChildObjCnt; /// 
              
 /// 数据子项数量 /// 
 private int m_dataChildCnt; private RectTransform m_rectTrans; private Transform m_selfTrans; private GridLayoutGroup m_gridLayoutGroup; private List
              
                m_childrenRectTransList; private Vector2 m_startPos; private int m_realIndex; private int m_realIndexUp; private Vector2 m_gridLayoutSize; private Dictionary
               
                 m_childsAnchoredPos; private Vector2 m_gridLayoutPos; private Dictionary
                
                  m_childsSiblingIndex; [SerializeField] private ScrollRect m_scrollRect; public delegate void UpdateChildrenCallbackDelegate(int index, Transform trans); public UpdateChildrenCallbackDelegate updateChildrenCallback = null;}
                
               
              
             
            
           
          
         
        
       
      
     
    
   

/// 
/// 列表子项画师/// Author: LXF/// 
using UnityEngine;using UnityEngine.UI;public class ScrollListDrawer : MonoBehaviour{    UGUIWrapContent infinityGridLayoutGroup;    int amount = 10;    void Start()    {        //初始化数据列表//        infinityGridLayoutGroup = transform.GetComponent
   
    ();        infinityGridLayoutGroup.SetAmount(amount);        infinityGridLayoutGroup.updateChildrenCallback = UpdateChildrenCallback;    }    void OnGUI()    {        if (GUILayout.Button("Add one item"))        {            infinityGridLayoutGroup.SetAmount(++amount);        }    }    void UpdateChildrenCallback(int index, Transform trans)    {        OnDraw(index, trans);    }    private void OnDraw(int index, Transform trans)    {        Text text = trans.Find("Text").GetComponent
    
     ();        text.text = index.ToString();    }}
    
   

转载地址：https://linxinfa.blog.csdn.net/article/details/70767777 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！