public class ScrollViewListener : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler
  {
 //滑動(dòng)方向
    public enum MoveDirection
    {
      None = 0,
      Left,
      Right,
    }
    public float SingleItemWidth;//單個(gè)滑動(dòng)頁的寬度
    public RectTransform content;//當(dāng)前ScrollView的Content
    public float DragMinValue = 5f;//拖動(dòng)過程中允許的最小的拖拽值，低于此值就不算拖拽，不執(zhí)行翻頁事件
    private MoveDirection direction = MoveDirection.None;
    private int CurIndex = 0;//當(dāng)前頁碼
    private int MaxIndex = 0;//最大頁碼
    public bool canMove = true;//是否能移動(dòng)
    private Vector3 originalPos;
    private float maxDeltaX = 0f;//取整個(gè)拖動(dòng)過程中的最大值
    public Action<int> OnPageChange;//對(duì)外提供頁碼修改的回調(diào)
 
    /// <summary>
    /// 滑到下一頁
    /// </summary>
    private void MoveToNext()
    {      
      if (direction == MoveDirection.Left)
      {
        if (CurIndex < MaxIndex)
        {          
          CurIndex++;
          canMove = false;
          content.DOLocalMoveX(content.localPosition.x - SingleItemWidth, 1f).OnComplete(() =>
          {
            if (null != OnPageChange)
            {
              OnPageChange(CurIndex);
            }
            canMove = true;
          });
        }
      }
      else if (direction == MoveDirection.Right)
      {
        if (CurIndex > 0)
        {
          CurIndex--;
          canMove = false;
          content.DOLocalMoveX(content.localPosition.x + SingleItemWidth, 1f).OnComplete(() =>
          {
            if (null != OnPageChange)
            {
              OnPageChange(CurIndex);
            }
            canMove = true;
          });
        }
      }
    }
 
    /// <summary>
    /// 設(shè)置當(dāng)前滑動(dòng)列表的頁數(shù)的最大值
    /// </summary>
    /// <param name="max"></param>
    public void SetMaxIndex(int max)
    {
      MaxIndex = max - 1;//最大下標(biāo)值為頁數(shù)減1
    }
 
    /// <summary>
    /// 設(shè)置當(dāng)前頁
    /// </summary>
    /// <param name="index"></param>
    public void SetCurIndex(int index)
    {
      CurIndex = index;
      float x = content.localPosition.x - SingleItemWidth * CurIndex;
      content.localPosition = new Vector3(x, content.localPosition.y, content.localPosition.z);
    }
 
    public void ResetPosition()
    {
      content.localPosition = originalPos;
    }
 
    private void Awake()
 {
      CurIndex = 0;
      originalPos = content.localPosition;
    }
 
    public void OnDrag(PointerEventData eventData)
    {
      if (Mathf.Abs(eventData.delta.x) > maxDeltaX)
      {
        maxDeltaX = Mathf.Abs(eventData.delta.x);
      }
    }
 
    public void OnBeginDrag(PointerEventData eventData)
    {
      if (eventData.delta.x > 0)
      {
        direction = MoveDirection.Right;
      }
      else if (eventData.delta.x < 0)
      {
        direction = MoveDirection.Left;
      }
      else
      {
        direction = MoveDirection.None;
      }
      if (Mathf.Abs(eventData.delta.x) > maxDeltaX)
      {
        maxDeltaX = Mathf.Abs(eventData.delta.x);
      }
    }
 
    public void OnEndDrag(PointerEventData eventData)
    {
      if (Mathf.Abs(eventData.delta.x) > maxDeltaX)
      {
        maxDeltaX = Mathf.Abs(eventData.delta.x);
      }
      if (maxDeltaX > DragMinValue)
      {
        //計(jì)算下一頁的目的點(diǎn) 然后移動(dòng)
        if (canMove)
        {
          MoveToNext();
        }        
      }
      maxDeltaX = 0f;
    }
  }