Unity中有很多地方需要列表，但展示的项目过多，就不能全部创建，太耗性能，这样做也会被boss骂死，这就需要动态列表
using UnityEngine; using System.Collections; using System.Collections.Generic; using UnityEngine.UI; namespace DynamicGridFloader { public class DynamicGrid : MonoBehaviour { public float cellX; public float cellY; public float space; public GameObject prefab; private ScrollRect _scrollRect; private RectTransform _scrollRectRectT; private RectTransform _content; private int _previousTopIndex = -1; private int _pageCount; private bool _firstIni = true; private List<Cell> _activeList = new List<Cell>(); private List<Cell> _catchList = new List<Cell>(); private List<CellVo> _dataList = new List<CellVo>(); void Awake() { creat(); } void Update() { int currentIndex = getTopIndex(); if (currentIndex != _previousTopIndex) { refreshData(currentIndex); } } /// <summary> /// 创建物体 /// </summary> private void creat() { _scrollRect = this.GetComponent<ScrollRect>(); _scrollRectRectT = _scrollRect.GetComponent<RectTransform>(); _content = _scrollRect.content; _pageCount = Mathf.FloorToInt(_scrollRectRectT.sizeDelta.y / (cellY + space)) + 3; Vector2 size = new Vector2(cellX, cellY); for (int i = 0; i < _pageCount; i++) { GameObject go = Instantiate(prefab); go.GetComponent<RectTransform>().sizeDelta = size; go.transform.SetParent(_content); go.transform.localScale = Vector3.one; go.GetComponent<RectTransform>().anchoredPosition = Vector2.zero; go.SetActive(false); Cell c = go.GetComponent<Cell>(); _catchList.Add(c); } } /// <summary> /// 设置数据 /// </summary> /// <param name="data"></param> /// <param name="goUp">是否移到最顶端</param> public void SetData(List<CellVo> data, bool goUp = true) { _dataList = data; //计算content高度 float height = (cellY + space) * _dataList.Count - space; Vector2 size = _content.sizeDelta; size.y = height; _content.sizeDelta = size; if (goUp) _content.anchoredPosition = Vector2.zero; if (!_firstIni && _dataList.Count < _pageCount) refreshData(0, true); _firstIni = false; } /// <summary> /// 刷新数据 /// </summary> /// <param name="index">刷新数据的其实标识点</param> /// <param name="ignore">当重新赋值时，data的长度小于可显示的长度，这是要刷新一下数据，因为索引值不会变</param> private void refreshData(int index, bool ignore = false) { if ((_previousTopIndex == index || index < 0) && !ignore) return; _previousTopIndex = index; catchAllCell(); for (int i = 0; i < _pageCount; i++) { if (index + i >= _dataList.Count) break; Cell c = activeACell(); c.GetComponent<RectTransform>().anchoredPosition = getCellPos(index + i); c.SetData(_dataList[index + i]); } } /// <summary> /// 获取最上面显示的Cell的索引 /// </summary> /// <returns></returns> private int getTopIndex() { int index = 0; float topPos = _content.anchoredPosition.y; index = Mathf.FloorToInt(topPos / (cellY + space)); return index; } /// <summary> /// 获取第N个Cell的位置 /// </summary> /// <param name="index"></param> /// <returns></returns> private Vector2 getCellPos(int index) { Vector2 pos = Vector2.zero; pos.y = index * (cellY + space) * -1f; return pos; } /// <summary> /// 激活一个Cell /// </summary> /// <returns></returns> private Cell activeACell() { Cell c = null; if (_catchList.Count > 0) { c = _catchList[_catchList.Count - 1]; _catchList.RemoveAt(_catchList.Count - 1); _activeList.Add(c); } else { } c.gameObject.SetActive(true); return c; } /// <summary> /// 缓存一个Cell /// </summary> /// <param name="c"></param> private void catchACell(Cell c) { _catchList.Add(c); _activeList.Remove(c); c.gameObject.SetActive(false); } /// <summary> /// 缓存所有Cell /// </summary> private void catchAllCell() { for (int i = _activeList.Count - 1; i >= 0; i--) { catchACell(_activeList[i]); } } } }下面附上工程地址：http://download.csdn.net/download/liujunjie612/9834691
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