Unity中关于ScrollRect组件完整解决方案(ScrollRect中元素自动排版+ScrollRect中元素自动定位到Viewport可见范围内)

本文主要是介绍Unity中关于ScrollRect组件完整解决方案(ScrollRect中元素自动排版+ScrollRect中元素自动定位到Viewport可见范围内)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

这个教程可以实现点击我这个视频中所示的效果

一、元素自动排版功能

1、首先要往我们的unity项目中导入两个脚本文件，脚本文件名称分别是UIScrollEventListener和CZScrollRect，这两个脚本文件代码如下所示。

1-1、介绍UIScrollEventListener脚本写法。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;public class UIScrollEventListener : MonoBehaviour, IBeginDragHandler, IEndDragHandler , IPointerUpHandler, IPointerDownHandler , IDragHandler
{public delegate void VoidDelegate(PointerEventData pdata);public VoidDelegate onBeginDrag;public VoidDelegate onEndDrag;public VoidDelegate onUp;public VoidDelegate onDown;public VoidDelegate onDrag;bool isDrag = false;List<Image> registers = new List<Image>();public static UIScrollEventListener Get(GameObject go){UIScrollEventListener listener = go.GetComponent<UIScrollEventListener>();if (listener == null) listener = go.AddComponent<UIScrollEventListener>();return listener;}public void OnBeginDrag(PointerEventData eventData){isDrag = true;if (onBeginDrag != null) onBeginDrag(eventData);}public void OnEndDrag(PointerEventData eventData){isDrag = false;if (onEndDrag != null) onEndDrag(eventData);}public void OnPointerUp(PointerEventData eventData){if (!isDrag) {SetRegisterEvent(true);PraseObject(eventData);SetRegisterEvent(false);}if (onUp != null) onUp(eventData);}public void OnPointerDown(PointerEventData eventData){if (onDown != null) onDown(eventData);}public void OnDrag(PointerEventData eventData) {if (onDrag != null) onDrag(eventData);}public void RegisterButton(GameObject go){Image img = go.GetComponent<Image>();if (img != null){img.raycastTarget = false;registers.Add(img);}}void SetRegisterEvent(bool b) {if (registers.Count > 0){for (int i = 0; i < registers.Count; ++i){registers[i].raycastTarget = b;}}}void PraseObject(PointerEventData eventData) {if (registers.Count > 0){for (int i = 0; i < registers.Count; ++i){if (EventSystem.current != null){List<RaycastResult> result = new List<RaycastResult>();EventSystem.current.RaycastAll(eventData, result);foreach (RaycastResult r in result){//Debug.Log(r.gameObject.name);foreach (Image img in registers){if (img.gameObject.Equals(r.gameObject)){InputField inputfield = img.gameObject.GetComponent<InputField>();if (inputfield != null) inputfield.ActivateInputField();}}}}}}}}

1-2、介绍CZScrollRect脚本写法。

using System;
using UnityEngine;
using UnityEngine.UI;public class ScrollObj
{public GameObject obj;public int dex;
}public class CZScrollRect
{public enum TipType{UNDO_REFRESH = 0,PULL_REFRESH = 1,UNDO_APPEND = 2,PULL_AAPEND = 3,NODATA = 4,NONE = 5}const int OPEAT_HEIGHT = 100;//高度差判断操作类型const int INIT_NUM_LIMIT = 8;//列表实例化个数public delegate void OperatDelegate();public delegate void OperatObjDelegate(GameObject obj , int index);public delegate void OperatTextObjDelegate(GameObject obj, TipType t);public OperatDelegate onRefresh;//下拉刷新时回调public OperatDelegate onAppend;//需要加载更多时回调public OperatObjDelegate onScrollObj;//需刷新时回调public OperatTextObjDelegate onUpdateTextObj;//需刷新文本状态时回调public ScrollRect scrollRect;//ScrollRectprivate RectTransform scrollRectContent;//RectTransformpublic GameObject prefab;//实例化的对象public GameObject text_up;//下拉刷新文本public GameObject text_down;//上拉加载更多文本TipType textup_status;int opeartLen = 0;//记录总长度public int layoutwidth = 1242;//填写item的长度public int limitNum = 8;//列表实例化个数public float interval = 200;//每个item的高度public float spacing = 5;//每个tiem的间隔ScrollObj[] list;//用于管理生成的对象int opeartType;int pageindex;//页码bool bHasMore;//是否能加载更多int halfWidth;//public GameObject batchContent;public CZScrollRect(){opeartType = -1;hasMore = false;}/// <summary>/// 用于控制scrollrect是否能够滑动/// （用于等待网络请求等业务）/// </summary>public bool vertical{get{return scrollRect.vertical;}set{scrollRect.vertical = value;}}/// <summary>/// 是否存在更多/// </summary>public bool hasMore{get{return bHasMore;}set{bHasMore = value;}}/// <summary>/// 获取对象所在的索引/// </summary>/// <param name="obj"></param>/// <returns></returns>public int GetObjIndex(GameObject obj) {for(int i = 0; i < list.Length; ++i){if (obj.Equals(list[i].obj))