使用EventTrigger添加OnPointerXXX回调事件

EventTrigger trigger = compareBtn.GetComponent<EventTrigger>();
        EventTrigger.Entry entry = new EventTrigger.Entry();
        entry.eventID = EventTriggerType.PointerDown;
        entry.callback.AddListener((data) =>
        {
            OnPointerDownDelegate((PointerEventData)data);
        });
        trigger.triggers.Add(entry);
        EventTrigger.Entry entry2 = new EventTrigger.Entry();
        entry2.eventID = EventTriggerType.PointerUp;
        entry2.callback.AddListener((data) =>
        {
            OnPointerUpDelegate((PointerEventData)data);
        });
        trigger.triggers.Add(entry2);