UGUI（四）事件系统的封装

UGUI的事件系统默认使用时，是需要当前的类继承事件接口，就可以在该类中加入它的事件方法，但是在多人开发时这种方式没什么好处。

用过NGUI的或许都知道UIEventListener这个类，因为使用超级方便，直接加入UI对象进行事件注册即可。其实UGUI也可以模仿这种方式进行封装。

代码如下：

1. usingUnityEngine;
2. usingSystem.Collections;
3. usingUnityEngine.EventSystems;
4. publicclassUUIEventListener
   : MonoBehaviour,
5. IPointerClickHandler,
6. IPointerDownHandler,
7. IPointerEnterHandler,
8. IPointerExitHandler,
9. IPointerUpHandler,
10. ISelectHandler,
11. IUpdateSelectedHandler,
12. IDeselectHandler,
13. IDragHandler,
14. IEndDragHandler,
15. IDropHandler,
16. IScrollHandler,
17. IMoveHandler
18. {
19. publicdelegate
    voidVoidDelegate(GameObject
    go);
20. publicVoidDelegate
    onClick;
21. publicVoidDelegate
    onDown;
22. publicVoidDelegate
    onEnter;
23. publicVoidDelegate
    onExit;
24. publicVoidDelegate
    onUp;
25. publicVoidDelegate
    onSelect;
26. publicVoidDelegate
    onUpdateSelect;
27. publicVoidDelegate
    onDeSelect;
28. publicVoidDelegate
    onDrag;
29. publicVoidDelegate
    onDragEnd;
30. publicVoidDelegate
    onDrop;
31. publicVoidDelegate
    onScroll;
32. publicVoidDelegate
    onMove;
33. publicobject
    parameter;
34. publicvoidOnPointerClick(PointerEventData
    eventData) { if(onClick
    != null)onClick(gameObject);
    }
35. publicvoidOnPointerDown(PointerEventData
    eventData) { if(onDown
    != null)onDown(gameObject);
    }
36. publicvoidOnPointerEnter(PointerEventData
    eventData) { if(onEnter
    != null)onEnter(gameObject);
    }
37. publicvoidOnPointerExit(PointerEventData
    eventData) { if(onExit
    != null)onExit(gameObject);
    }
38. publicvoidOnPointerUp(PointerEventData
    eventData) { if(onUp
    != null)onUp(gameObject);
    }
39. publicvoidOnSelect(BaseEventData
    eventData) { if(onSelect
    != null)onSelect(gameObject);
    }
40. publicvoidOnUpdateSelected(BaseEventData
    eventData) { if(onUpdateSelect
    != null)onUpdateSelect(gameObject);
    }
41. publicvoidOnDeselect(BaseEventData
    eventData) { if(onDeSelect
    != null)onDeSelect(gameObject);
    }
42. publicvoidOnDrag(PointerEventData
    eventData) { if(onDrag
    != null)onDrag(gameObject);
    }
43. publicvoidOnEndDrag(PointerEventData
    eventData) { if(onDragEnd
    != null)onDragEnd(gameObject);
    }
44. publicvoidOnDrop(PointerEventData
    eventData) { if(onDrop
    != null)onDrop(gameObject);
    }
45. publicvoidOnScroll(PointerEventData
    eventData) { if(onScroll
    != null)onScroll(gameObject);
    }
46. publicvoidOnMove(AxisEventData
    eventData) { if(onMove
    != null)onMove(gameObject);
    }
47. staticpublicUUIEventListener
    Get(GameObject go)
48. {
49. UUIEventListenerlistener
    = go.GetComponent();
50. if(listener
    == null)listener
    = go.AddComponent();
51. returnlistener;
52. }
53. }

使用方式：

1. UUIEventListener.Get(btn.gameObject).onClick=
   OnClickBtn;
2. UUIEventListener.Get(btn.gameObject).parameter=
   index;
3. privatevoidOnClickBtn(GameObject
   go)
4. {
5. intindex
   = (int)UUIEventListener.Get(go).parameter;
6. Debug.Log("您单击的索引为："+
   index);
7. }