點擊空白處

            EventTrigger et = m_EmptyImage.gameObject.AddComponent<EventTrigger>();
            EventTrigger.Entry e1 = new EventTrigger.Entry();
            e1.eventID = EventTriggerType.PointerDown;
            e1.callback = new EventTrigger.TriggerEvent();
            if(m_IsInteract)
            {
                e1.callback.AddListener(new UnityAction<BaseEventData>(this.OnBackPress));
            }
            et.triggers.Add(e1);