scrollImage，拖动循环图片

/***

• 图片滑动

• 新建Image重命名为ScrollPanel+ScrollRect组件，+Mask组件，ScrollRect:Content=GridLayout(拖拽内容=子空对象)，此脚本挂载在ScrollPanel上

• 新建空对象重命名为GridLayout为ScrollPanel子对象,+GridLayoutGroup组件

• 新建几个Image为GridLayout子对象

• GridLayoutGroup组件：中心点，设置左。Cell Size大小为每一个图片的大小：如300200，WidthHeight为，6张图片，630000*200

• 需要引入事件命名空间using UnityEngine.EventSystems;using UnityEngine.UI;

• 需要实现拖拽接口IBeginDragHandler,IEndDragHandler

• //新建空对象重命名为ToggleGroup+ToggleGroup组件（开关//单选框使用）

• //新建几个Image重命名为Toggle1为空对象ToggleGroup的子对象+Toggle组件，设置Group为父空对象，设置Graphic为子对象（选中后显示的图片）

• //新建Imagec重命名为ToggleGraphic为Toggle的子对象（选中后显示的图片）

• //为每个Toggle,写一个方法，并注册，

• 非子萧201707
  */
  using System;
  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  using UnityEngine.EventSystems;//需要引入命名空间
  using UnityEngine.UI;//需要引入命名空间
  //需要实现拖拽开始，结束接口
  public class ScrollPanelControl : MonoBehaviour, IBeginDragHandler, IEndDragHandler,IDragHandler
  {

  private ScrollRect scrollRect;//滑动组件
  //4张图可滑动3张，(0-1)=1/3=0.333f,0.666f,1,;6张图可滑动5张，1/5=0.2f,0.4f,0.6f,0.8f,1f；10张图片课滑动9张，1/9=0.11f,0.22f;0.33f
  private float[] pageArray = new float[] { 0,0.111f,0.222f,0.333f,0.444f,0.555f,0.666f,0.777f,0.888f,1f };//图片数组位置
  //private float[] pageArray = new float[] { 0, 0.2f, 0.4f, 0.6f, 0.8f, 1f };//图片数组位置

  public Toggle[] toggleArray;//（单选框）开关数组；
  private float targetHorizontalPosition = 0;//目标位置
  private float smoothing = 4f;//滑动速度
  private bool isDrag = false;//是否拖拽=否
  private bool isDrag2 = false;//是否拖拽=否
  private Transform Content;//
  private int index=0;
  private Button nextButton;//下一个按钮
  private Button prevButton;//上一个按钮

  private void Awake()
  {
  scrollRect = GetComponent<ScrollRect>();

   Content =transform.Find("Content");
   nextButton = transform.parent.Find("NextPageButton").GetComponent<Button>();
   prevButton = transform.parent.Find("LastPageButton").GetComponent<Button>();
  
   prevButton.onClick.AddListener(OnPrevButtonClick);
   nextButton.onClick.AddListener(OnNextButtonClick);
  

  }
  void Start()
  {
  }
  void Update()
  {
  if (!isDrag)
  {
  scrollRect.horizontalNormalizedPosition = Mathf.Lerp(scrollRect.horizontalNormalizedPosition, targetHorizontalPosition, Time.deltaTime * smoothing);
  }
  ////循环拖动，到尾了，从头开始
  //if (Content.position.x > 100f)
  //{
  // scrollRect.horizontalNormalizedPosition = pageArray[pageArray.Length - 1];
  // targetHorizontalPosition = pageArray[pageArray.Length - 1];
  // toggleArray[pageArray.Length - 1].isOn = true;
  //}
  //if (Content.position.x < -17380f)
  //{
  // scrollRect.horizontalNormalizedPosition = pageArray[0];
  // targetHorizontalPosition = pageArray[0];
  // toggleArray[0].isOn = true;
  //}
  }
  public void OnDrag(PointerEventData eventData)
  {
  isDrag = true;
  }
  public void OnBeginDrag(PointerEventData eventData)//实现接口
  {
  isDrag = true;
  }
  public void OnEndDrag(PointerEventData eventData)//实现接口
  {
  isDrag = false;

   float posX = scrollRect.horizontalNormalizedPosition;
   //float offset = Mathf.Abs(pageArray[index] - posX);
   ////private int index=0;
   //for (int i = 0; i < pageArray.Length; i++)
   //{
   //    float offsetTemp = Mathf.Abs(pageArray[i] - posX);
   //    print("offsetTemp"+offsetTemp);
   //    if (offsetTemp < offset)
   //    {
   //        index = i;
   //        offset = offsetTemp;
   //    }
   //}
   //scrollRect.horizontalNormalizedPosition = pageArray[index];
   //targetHorizontalPosition = pageArray[index];
   //toggleArray[index].isOn = true;
   //print("offset"+offset);
  
   float offset2 = pageArray[index] - posX;
   //当向右拖动一定距离（0.02），就到达下一页
   if (offset2 > 0.015f)
   {
       OnPrevButtonClick();
       // print("next");
   }
   //当向左拖动一定距离，就到达上一页
   if (offset2 < -0.015f)
   {
       OnNextButtonClick();
       // print("prev");
   }
  

  }
  //上一个按钮点击，显示上一页
  public void OnPrevButtonClick()
  {
  if (index==0)
  {
  toggleArray[9].isOn = true;
  index = 9;
  }
  else
  {
  toggleArray[index-1].isOn = true;
  index = index - 1;
  }
  }
  //下一个按钮点击,显示下一页
  public void OnNextButtonClick()
  {
  if (index == 9)
  {
  toggleArray[0].isOn = true;
  index = 0;
  }
  else
  {
  toggleArray[index+1].isOn = true;
  index = index + 1;
  }
  }
  public void OnToggleChange0(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[0];
  //}
  }
  public void OnToggleChange1(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[1];
  //}
  }
  public void OnToggleChange2(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[2];
  //}
  }
  public void OnToggleChange3(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[3];
  //}
  }
  public void OnToggleChange4(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[4];
  //}
  }
  public void OnToggleChange5(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[5];
  //}
  }
  public void OnToggleChange6(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[6];
  //}
  }
  public void OnToggleChange7(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[7];
  //}
  }
  public void OnToggleChange8(bool isOn)

  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[8];
  //}
  }
  public void OnToggleChange9(bool isOn)
  {
  //if (isOn)
  //{
  targetHorizontalPosition = pageArray[9];
  //}
  }

}