【Unity3D】【NGUI】循环Scroll View

来源：互联网发布：cross over for mac 编辑：程序博客网时间：2024/05/22 14:21

NGUI讨论群：333417608

NGUI版本3.0.9 f4

脚本的作用：使用10个甚至更少的item模拟成百上千的item数据。在滑动过程中，如果拖到最后面的时候，会拿第一个过来补位。所以要正确的设置补位的那个item的数据。滑到最前面也是一样，用最后面的那个过来补位。

方法：

1、脚本放在Scroll View下面的UIGrid的那个物体上

2、UIScrollView的Restrict Within Panel勾选掉

3、Scroll View上面的UIPanel的Cull勾选上

4、你的每一个Item都放上一个UIWidget，调整到合适的大小（用它的Visiable）

5、仅仅是提供思路，具体每个Item的内容怎么更新什么的自己研究吧。

6、应该没问题了。有问题加群问。

附代码：

using UnityEngine;using System.Collections;using System.Collections.Generic;[RequireComponent(typeof(UIGrid))]public class SZUILoopScrollView : MonoBehaviour {public string perfix = string.Empty;private List<UIWidget> itemList = new List<UIWidget>();private Vector4 posParam;private Transform cachedTransform;void Awake(){cachedTransform = this.transform;UIGrid grid = this.GetComponent<UIGrid>();float cellWidth = grid.cellWidth;float cellHeight = grid.cellHeight;posParam = new Vector4(cellWidth, cellHeight, grid.arrangement == UIGrid.Arrangement.Horizontal ? 1 : 0,grid.arrangement == UIGrid.Arrangement.Vertical ? 1 : 0);}void Start(){for (int i=0; i<cachedTransform.childCount; ++i){Transform t = cachedTransform.GetChild(i);UIWidget uiw = t.GetComponent<UIWidget>();uiw.name = string.Format("{0}_{1:D3}", perfix, itemList.Count);itemList.Add(uiw);}}void LateUpdate(){if (itemList.Count > 1){int sourceIndex = -1;int targetIndex = -1;int sign = 0;bool firstVislable = itemList[0].isVisible;bool lastVisiable = itemList[itemList.Count-1].isVisible;// if first and last both visiable or invisiable then returnif (firstVislable == lastVisiable){return;}if (firstVislable){// move last to first onesourceIndex = itemList.Count-1;targetIndex = 0;sign = -1;}else if (lastVisiable){// move first to last onesourceIndex = 0;targetIndex = itemList.Count-1;sign = 1;}if (sourceIndex > -1){UIWidget movedWidget = itemList[sourceIndex];Vector3 offset = new Vector3(sign*posParam.x * posParam.z, sign*posParam.y * posParam.w, 0);movedWidget.cachedTransform.localPosition = itemList[targetIndex].cachedTransform.localPosition + offset;// change item indexitemList.RemoveAt(sourceIndex);itemList.Insert(targetIndex, movedWidget);}}}}

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