public class ScrollPage : MonoBehaviour, IBeginDragHandler, IEndDragHandler
    {
        private ScrollRect scrollRect;
        private float[] pageArray;
        public Toggle[] ToggleArray;
        public float speed;
        private float targetHorizontalPosition;
        private float m_fTrigerOffset;                                              // 滑動觸發翻頁的偏移量;
        private float m_fDragStartPosX;                                             // 開始滑動的初始X軸位置;
        private int m_nIndex;                                                       // 當前頁序號;
        private bool isDraging;
        public Action<int> m_PageChangeCallBack;


        private void Awake()
        {
            speed = 5f;
            targetHorizontalPosition = 0f;
            m_fDragStartPosX = 0;                                             // 開始滑動的初始X軸位置;
            m_nIndex = 0;                                                       // 當前頁序號;
            isDraging = false;

            scrollRect = transform.GetComponent<ScrollRect>();
            m_fTrigerOffset = transform.GetComponent<RectTransform>().sizeDelta.x * 0.22f;
        }

        private void Start()
        {
            pageArray = new float[ToggleArray.Length];
            for (int i = 0; i < pageArray.Length; i++)
            {
                pageArray[i] = (float)i / (pageArray.Length - 1);
            }

            for (int i = 0; i < ToggleArray.Length; i++)
            {
                int nIndex = i;
                ToggleArray[i].isOn = i == 0;
                ToggleArray[i].onValueChanged.AddListener((bool isChange) =>
                {
                    if (isChange)
                    {
                        OnClickToggle(nIndex);
                    }
                });
            }
        }


        void Update()
        {
            if (!isDraging)
            {
                scrollRect.horizontalNormalizedPosition = Mathf.Lerp(scrollRect.horizontalNormalizedPosition, targetHorizontalPosition, Time.deltaTime * speed);
            }

        }
        public void OnBeginDrag(PointerEventData eventData)
        {
            isDraging = true;
            m_fDragStartPosX = eventData.position.x;
        }
        public void OnEndDrag(PointerEventData eventData)
        {
            isDraging = false;
            int nIndex = m_nIndex;
            float fXOffset = eventData.position.x - m_fDragStartPosX;
            if (fXOffset > m_fTrigerOffset && nIndex > 0)
            {
                nIndex--;
            }
            else if (fXOffset < -m_fTrigerOffset && nIndex < pageArray.Length - 1)
            {
                nIndex++;
            }

            for (int i = 0; i < ToggleArray.Length; i++)
            {
                ToggleArray[i].isOn = i == nIndex;
            }
        }

        void OnClickToggle(int nIndex)
        {
            targetHorizontalPosition = pageArray[nIndex];
            for (int i = 0; i < ToggleArray.Length; i++)
            {
                ToggleArray[i].isOn = i == nIndex;
            }
            m_nIndex = nIndex;

            if(m_PageChangeCallBack != null)
            {
                m_PageChangeCallBack(m_nIndex);
            }
        }
    }