using UnityEngine; using System.Collections; using System.Collections.Generic; using UnityEngine.UI; /// <summary> /// 無限循環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;//頁面的第一行（列）在整個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>/// 由格子數量獲取多少行多少列/// </summary>/// <param name="num"></param>格子個數/// <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>/// 設置content的大小/// </summary>/// <param name="rows"></param>行數/// <param name="cols"></param>列數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]);}} }

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

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本文固定鏈接：http://www.cnblogs.com/fly-100/p/4549354.html

轉載于:https://www.cnblogs.com/porter/p/5684785.html

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