UGUI检测鼠标进入退出

引用：
using UnityEngine.EventSystems;
继承：
public class Method : EventTrigger
重写：
(1)进入：
public override void OnPointerEnter(PointerEventData eventData)
(2)退出：
public override void OnPointerExit(PointerEventData eventData)
在EventTrigger中还有很多其他函数，如拖拽，移动，点击，取消等等
例：

using UnityEngine;using UnityEngine.UI;using UnityEngine.EventSystems;public class BackGroundShow : EventTrigger{    public override void OnPointerExit(PointerEventData eventData)    {        Debug.Log("Exit");        //退出动画        Animation ani = this.transform.parent.gameObject.GetComponent<Animation>();        ani["UIAnimation"].speed = 1;        ani.Blend("UIAnimation");    }    public override void OnPointerEnter(PointerEventData eventData)    {        Debug.Log("Enter");        //进入动画        Animation ani = this.transform.parent.gameObject.GetComponent<Animation>();        ani["UIAnimation"].speed = -1;        ani.Blend("UIAnimation");    }}