void Start()
{
toolTip = GameObject.FindObjectOfType <_ToolTip>();//根据类型获取
canvas = GameObject.Find("Canvas").GetComponent <Canvas>();
pickedItem = GameObject.Find("PickedItem").GetComponent <_ItemUI>();
pickedItem.Hide();//开始为隐藏状态
}
void Update()
{
if (isToolTipShow == true && isPickedItem == false) //控制提示框跟随鼠标移动
{
Vector2 postionToolTip;
RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform, Input.mousePosition, null, out postionToolTip);
toolTip.SetLocalPosition(postionToolTip + toolTipOffset); //设置提示框的位置，二维坐标会自动转化为三维坐标但Z坐标为0
}
else if (isPickedItem == true) //控制盛放物品的容器UI跟随鼠标移动
{
Vector2 postionPickeItem;
RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform, Input.mousePosition, null, out postionPickeItem);
pickedItem.SetLocalPosition(postionPickeItem);//设置容器的位置，二维坐标会自动转化为三维坐标但Z坐标为0
}
//物品丢弃功能：
if (isPickedItem == true && Input.GetMouseButtonDown(0) && UnityEngine.EventSystems.EventSystem.current.IsPointerOverGameObject(-1) == false)//UnityEngine.EventSystems.EventSystem.current.IsPointerOverGameObject(-1) == false 表示判断鼠标是否正在在UI上
{
isPickedItem = false;
pickedItem.Hide();
}
}