鼠标的进入和退出

public class GridUI : MonoBehaviour ,IPointerEnterHandler,IPointerExitHandler
    //实现两个接口，用于进入和退出
{
    //action system上的委托，无参数无返回值
    public static Action<Transform> OnEnter;
    public static Action OnExit;

    public void OnPointerEnter(PointerEventData eventData)
    {
        if (eventData.pointerEnter.tag == "Grid")
        {
            if (OnEnter != null)
                OnEnter(transform);
        }
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        if (eventData.pointerEnter.tag == "Grid")
        {
            if (OnExit != null)
                OnExit();
        }
    }
}
 

用UI元素的世界坐标和canvas的RectTrasform，换算出元素在Canvas的2D坐标。

//获取鼠标的坐标
Vector2 position;
RectTransformUtility.ScreenPointToLocalPointInRectangle(GameObject.Find
("KnapsackUI").transform as RectTransform, Input.mousePosition, null, out position);