Unity UGUI —— 无限循环List(转载)

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using UnityEngine; using System.Collections; using System.Collections.Generic; using UnityEngine.UI; /// <summary> /// 无限循环List /// 作者：EdisonLee /// public class UILoop1 : UIBase {       enum Direction     {         Horizontal,         Vertical     }       [SerializeField]     private RectTransform m_Cell;       [SerializeField]     private Vector2 m_Page;       [SerializeField]     Direction direction = Direction.Horizontal;       [SerializeField,Range(4,10)]     private int m_BufferNo;       private List<RectTransform> m_InstantiateItems = new List<RectTransform>();       private IList m_Datas;       public Vector2 CellRect { get { return m_Cell != null ? m_Cell.sizeDelta : new Vector2(100, 100); } }       public float CellScale { get { return direction == Direction.Horizontal ? CellRect.x : CellRect.y; } }       private float m_PrevPos = 0;     public float DirectionPos { get { return direction == Direction.Horizontal ? m_Rect.anchoredPosition.x : m_Rect.anchoredPosition.y; } }       private int m_CurrentIndex;//页面的第一行（列）在整个conten中的位置       private Vector2 m_InstantiateSize = Vector2.zero;     public Vector2 InstantiateSize     {         get         {             if (m_InstantiateSize == Vector2.zero)             {                 float rows, cols;                 if (direction == Direction.Horizontal)                 {                     rows = m_Page.x;                     cols = m_Page.y + (float)m_BufferNo;                 }                 else                 {                     rows = m_Page.x + (float)m_BufferNo;                     cols = m_Page.y;                 }                 m_InstantiateSize = new Vector2(rows, cols);             }             return m_InstantiateSize;         }     }       public int PageCount { get { return (int)m_Page.x * (int)m_Page.y; } }       public int PageScale { get { return direction == Direction.Horizontal ? (int)m_Page.x : (int)m_Page.y; } }       private ScrollRect m_ScrollRect;       private RectTransform m_Rect;     public int InstantiateCount { get { return (int)InstantiateSize.x * (int)InstantiateSize.y; } }     protected override void Awake()     {         m_ScrollRect = GetComponentInParent<ScrollRect>();         m_ScrollRect.horizontal = direction == Direction.Horizontal;         m_ScrollRect.vertical = direction == Direction.Vertical;           m_Rect = GetComponent<RectTransform>();           m_Cell.gameObject.SetActive(false);     }       public override void Data(object data)     {         m_Datas = data as IList;           if (m_Datas.Count > PageCount)         {             setBound(getRectByNum(m_Datas.Count));         }         else         {             setBound(m_Page);         }           if (m_Datas.Count > InstantiateCount)         {             while (m_InstantiateItems.Count < InstantiateCount)             {                 createItem(m_InstantiateItems.Count);             }         }         else         {             while (m_InstantiateItems.Count > m_Datas.Count)             {                 removeItem(m_InstantiateItems.Count - 1);             }               while (m_InstantiateItems.Count < m_Datas.Count)             {                 createItem(m_InstantiateItems.Count);             }         }     }          private void createItem(int index)     {         RectTransform item = GameObject.Instantiate(m_Cell);         item.SetParent(transform, false);         item.anchorMax = Vector2.up;         item.anchorMin = Vector2.up;         item.pivot = Vector2.up;         item.name = "item" + index;           item.anchoredPosition = direction == Direction.Horizontal ?             new Vector2(Mathf.Floor(index / InstantiateSize.x) * CellRect.x, -(index % InstantiateSize.x) * CellRect.y) :             new Vector2((index % InstantiateSize.y) * CellRect.x, -Mathf.Floor(index / InstantiateSize.y) * CellRect.y);         m_InstantiateItems.Add(item);         item.gameObject.SetActive(true);           updateItem(index, item.gameObject);     }       private void removeItem(int index)     {         RectTransform item = m_InstantiateItems[index];         m_InstantiateItems.Remove(item);         RectTransform.Destroy(item.gameObject);     }     /// <summary>     /// 由格子数量获取多少行多少列     /// </summary>     /// <param name="num"></param>格子个数     /// <returns></returns>     private Vector2 getRectByNum(int num)     {         return direction == Direction.Horizontal ?             new Vector2(m_Page.x, Mathf.CeilToInt(num / m_Page.x)) :             new Vector2(Mathf.CeilToInt(num / m_Page.y), m_Page.y);              }     /// <summary>     /// 设置content的大小     /// </summary>     /// <param name="rows"></param>行数     /// <param name="cols"></param>列数     private void setBound(Vector2 bound)     {         m_Rect.sizeDelta = new Vector2(bound.y * CellRect.x, bound.x * CellRect.y);     }       public float MaxPrevPos     {         get         {             float result;             Vector2 max = getRectByNum(m_Datas.Count);             if(direction == Direction.Horizontal)             {                 result = max.y - m_Page.y;             }             else             {                 result = max.x - m_Page.x;             }             return result * CellScale;         }     }     public float scale { get { return direction == Direction.Horizontal ? 1f : -1f; } }     void Update()     {         while (scale * DirectionPos - m_PrevPos < -CellScale * 2)         {             if (m_PrevPos <= -MaxPrevPos) return;               m_PrevPos -= CellScale;               List<RectTransform> range = m_InstantiateItems.GetRange(0, PageScale);             m_InstantiateItems.RemoveRange(0, PageScale);             m_InstantiateItems.AddRange(range);             for (int i = 0; i < range.Count; i++)             {                 moveItemToIndex(m_CurrentIndex * PageScale + m_InstantiateItems.Count + i, range[i]);             }             m_CurrentIndex++;         }           while (scale * DirectionPos - m_PrevPos > -CellScale)          {              if (Mathf.RoundToInt(m_PrevPos) >= 0) return;                m_PrevPos += CellScale;                m_CurrentIndex--;                if (m_CurrentIndex < 0) return;                List<RectTransform> range = m_InstantiateItems.GetRange(m_InstantiateItems.Count - PageScale, PageScale);              m_InstantiateItems.RemoveRange(m_InstantiateItems.Count - PageScale, PageScale);              m_InstantiateItems.InsertRange(0, range);              for (int i = 0; i < range.Count; i++)              {                  moveItemToIndex(m_CurrentIndex * PageScale + i, range[i]);              }          }     }       private void moveItemToIndex(int index, RectTransform item)     {         item.anchoredPosition = getPosByIndex(index);         updateItem(index, item.gameObject);     }       private Vector2 getPosByIndex(int index)     {         float x, y;         if(direction == Direction.Horizontal)         {             x = index % m_Page.x;             y = Mathf.FloorToInt(index / m_Page.x);         }         else         {             x = Mathf.FloorToInt(index / m_Page.y);             y = index % m_Page.y;         }           return new Vector2(y * CellRect.x, -x * CellRect.y);     }       private void updateItem(int index, GameObject item)     {         item.SetActive(index < m_Datas.Count);           if(item.activeSelf)         {             UILoopItem lit = item.GetComponent<UILoopItem>();             lit.UpdateItem(index, item);             lit.Data(m_Datas[index]);         }     } }

 

https://www.zhihu.com/question/23895384

 

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