UGUI之UI组件及GameObject的事件监听系统封装
发表于2018-09-20
第一种：用代码动态的给组件加监听事件，都是利用组件本身的事件接口去实现相应事件的方法，只不过是用代码实现的动态添加的事件监听。下面是放个按钮的添加监听事件的方法，其中一个是带参数的添加方法。
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;
public static class Develop
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public static void AddEventTrigger(this GameObject obj, EventTriggerType eventType, UnityAction<BaseEventData> myFunction)
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EventTrigger eventTrigger = obj.GetComponent<EventTrigger>();
if (eventTrigger == null)
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eventTrigger = obj.AddComponent<EventTrigger>();
eventTrigger.triggers = new List<EventTrigger.Entry>();
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UnityAction<BaseEventData> callback = new UnityAction<BaseEventData>(myFunction);
EventTrigger.Entry entry = new EventTrigger.Entry();
entry.eventID = eventType;
entry.callback.AddListener(callback);
eventTrigger.triggers.Add(entry);
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public static void RemoveEventTrigger(this GameObject obj)
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EventTrigger eventTrigger = obj.GetComponent<EventTrigger>();
if (eventTrigger == null)
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return;
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eventTrigger.triggers.Clear();
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public static void AddEventTrigger(this Image obj, EventTriggerType eventType, UnityAction<BaseEventData> myFunction)
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EventTrigger eventTrigger = obj.GetComponent<EventTrigger>();
if (eventTrigger == null)
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eventTrigger = obj.gameObject.AddComponent<EventTrigger>();
eventTrigger.triggers = new List<EventTrigger.Entry>();
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UnityAction<BaseEventData> callback = new UnityAction<BaseEventData>(myFunction);
EventTrigger.Entry entry = new EventTrigger.Entry();
entry.eventID = eventType;
entry.callback.AddListener(callback);
eventTrigger.triggers.Add(entry);
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public static void RemoveEventTrigger(this Image obj)
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EventTrigger eventTrigger = obj.gameObject.GetComponent<EventTrigger>();
if (eventTrigger == null)
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return;
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eventTrigger.triggers.Clear();
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public static void AddEventTrigger(this RawImage obj, EventTriggerType eventType, UnityAction<BaseEventData> myFunction)
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EventTrigger eventTrigger = obj.GetComponent<EventTrigger>();
if (eventTrigger == null)
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eventTrigger = obj.gameObject.AddComponent<EventTrigger>();
eventTrigger.triggers = new List<EventTrigger.Entry>();
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UnityAction<BaseEventData> callback = new UnityAction<BaseEventData>(myFunction);
EventTrigger.Entry entry = new EventTrigger.Entry();
entry.eventID = eventType;
entry.callback.AddListener(callback);
eventTrigger.triggers.Add(entry);
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public static void RemoveEventTrigger(this RawImage obj)
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EventTrigger eventTrigger = obj.gameObject.GetComponent<EventTrigger>();
if (eventTrigger == null)
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return;
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eventTrigger.triggers.Clear();
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第二种：是根据NGUI的UIEventListener衍生出来的，直接加入UI对象进行事件注册即可，也可以使用在非UI的GameObject上，这种方法如果用在非UI的物体上，需要在主相机上添加一个PhysicRaycaster组件才能使用。
using UnityEngine;
using UnityEngine.EventSystems;
public class UIEventListener : EventTrigger
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public delegate void VoidDelegate(GameObject go);
public delegate void VectorDelegate(GameObject go, Vector2 screenPosition);
public delegate void BoolDelegate(GameObject go, bool value);
public VoidDelegate onClick;
public VoidDelegate onDown;
public VoidDelegate onUp;
public BoolDelegate onHover;
public VectorDelegate onBeginDrag;
public VectorDelegate onDrag;
public VectorDelegate onEndDrag;
static public UIEventListener Get(GameObject go)
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PhysicsRaycaster raycaster = Camera.main.gameObject.GetComponent<PhysicsRaycaster>();
if (raycaster == null) raycaster = Camera.main.gameObject.AddComponent<PhysicsRaycaster>();
UIEventListener listener = go.GetComponent<UIEventListener>();
if (listener == null) listener = go.AddComponent<UIEventListener>();
return listener;
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public override void OnPointerClick(PointerEventData eventData)
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if (onClick != null) onClick.Invoke(gameObject);
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public override void OnPointerDown(PointerEventData eventData)
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if (onDown != null) onDown.Invoke(gameObject);
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public override void OnPointerUp(PointerEventData eventData)
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if (onUp != null) onUp.Invoke(gameObject);
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public override void OnPointerEnter(PointerEventData eventData)
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if (onHover != null) onHover.Invoke(gameObject, true);
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public override void OnPointerExit(PointerEventData eventData)
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if (onHover != null) onHover.Invoke(gameObject, false);
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public override void OnBeginDrag(PointerEventData eventData)
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Vector2 position;
Canvas canvas = FindObjectOfType<Canvas>();
RectTransform rect = canvas.GetComponent<RectTransform>();
if (RectTransformUtility.ScreenPointToLocalPointInRectangle(rect, eventData.position, canvas.worldCamera, out position))
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if (onBeginDrag != null) onBeginDrag.Invoke(gameObject, position);
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public override void OnDrag(PointerEventData eventData)
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Vector2 position;
Canvas canvas = FindObjectOfType<Canvas>();
RectTransform rect = canvas.GetComponent<RectTransform>();
if (RectTransformUtility.ScreenPointToLocalPointInRectangle(rect, eventData.position, canvas.worldCamera, out position))
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if (onDrag != null) onDrag.Invoke(gameObject, position);
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public override void OnEndDrag(PointerEventData eventData)
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Vector2 position;
Canvas canvas = FindObjectOfType<Canvas>();
RectTransform rect = canvas.GetComponent<RectTransform>();
if (RectTransformUtility.ScreenPointToLocalPointInRectangle(rect, eventData.position, canvas.worldCamera, out position))
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if (onEndDrag != null) onEndDrag.Invoke(gameObject, position);
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来自：https://blog.csdn.net/weixin_39706943/article/details/80507509