图片拖拽和交换位置

    public void OnBeginDrag(PointerEventData eventData)
    {
        m_OriginSlotTrasnform = transform.parent;  //记录当前Item的父对象位置
        transform.SetParent(m_UICanvasTransform); //防止其它物体阻挡Item的渲染
        m_InventoryGrid.ClearInfo();
    }

    public void OnDrag(PointerEventData eventData)
    {
        DragPos(eventData);
        this.gameObject.GetComponent<Image>().raycastTarget = false; //关闭Item的射线检测


    }

    public void OnEndDrag(PointerEventData eventData)
    {
        SetTargetPosition(eventData);
    }

    private void SetOriginPosition(GameObject item)  //回原位置
    {
        item.transform.SetParent(m_OriginSlotTrasnform);
        item.GetComponent<RectTransform>().anchoredPosition = m_OriginSlotTrasnform.GetComponent<RectTransform>().anchoredPosition;
        item.GetComponent<Image>().raycastTarget = true;
    }
    private void SetTargetPosition(PointerEventData eventData)
    {
        GameObject m_Hit = eventData.pointerCurrentRaycast.gameObject;
        if (eventData.pointerCurrentRaycast.depth == 0)
        {
            SetOriginPosition(gameObject);
            return;
        }
        if (m_Hit.CompareTag(TagsManager.m_InventoryGrid))  //空格子的时候
        {
            gameObject.transform.SetParent(m_Hit.transform);
            gameObject.GetComponent<RectTransform>().anchoredPosition = m_Hit.transform.GetComponent<RectTransform>().anchoredPosition;
            gameObject.GetComponent<Image>().raycastTarget = true;
        }
        else if (m_Hit.CompareTag(TagsManager.m_InventoryItem))
        {
           
            gameObject.transform.SetParent(m_Hit.transform.parent);
            gameObject.GetComponent<RectTransform>().anchoredPosition = m_Hit.transform.parent.GetComponent<RectTransform>().anchoredPosition;
            gameObject.GetComponent<Image>().raycastTarget = true;
            SetOriginPosition(m_Hit);

        }
        else
        {
            SetOriginPosition(gameObject);
        }
    }
    private void DragPos(PointerEventData eventData)
    {
        RectTransform RectItem = gameObject.GetComponent<RectTransform>();
        Vector3 globalMousePos;
        if (RectTransformUtility.ScreenPointToWorldPointInRectangle(gameObject.transform as RectTransform, eventData.position, eventData.pressEventCamera, out globalMousePos))
        {
            RectItem.position = globalMousePos;
        }
    }