UGUI 之 使用EventTrigger 按钮监听事件系统

创建自己的EventTriggerListener 类，继承自EventTrigger，，，

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class EventTriggerListener : UnityEngine.EventSystems.EventTrigger
{

    public delegate void VoidDelegate(GameObject go);  
    public VoidDelegate onClick;
    public VoidDelegate onSelect;
    public VoidDelegate onBegainDrag;
    public VoidDelegate onDown;
    public VoidDelegate onUp;

    public VoidDelegate onPress;
    public VoidDelegate DesPress;

    static public  EventTriggerListener Get(GameObject go)
    {  
        EventTriggerListener listener = go.GetComponent<EventTriggerListener>();  
        if (listener == null) listener = go.AddComponent<EventTriggerListener>();  
        return listener;  
    }
    public override void OnPointerClick(PointerEventData eventData)
    {
        if (onClick != null)
        {
            onClick(gameObject);
        }
    }
    public override void OnSelect(BaseEventData eventData)
    {
        if (onSelect != null) onSelect(gameObject);
    }

    public override void OnBeginDrag(PointerEventData eventData)
    {
        if (onBegainDrag != null) onBegainDrag(gameObject);
    }
    //public override void OnPointerDown(PointerEventData eventData)
    //{
    //    if (onDown != null) onDown(gameObject);
    //}
    //public override void OnPointerUp(PointerEventData eventData)
    //{
    //    if (onUp != null) onUp(gameObject);
    //}

    public override void OnPointerDown(PointerEventData eventData)
    {
        if (onPress != null)
        {
            onPress(gameObject);
        }
    }
    public override void OnPointerUp(PointerEventData eventData)
    {
        if (DesPress != null)
        {
            DesPress(gameObject);
        }
    }

}

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将上面的代码放到自己的项目中，就可以做监听按钮事件了，
在有UGUI的组件的游戏物体都可以使用，，例子如下：

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using UnityEngine.Events;
public class UIMain : MonoBehaviour {
	private Button	button;
	private Image image;
	void Start () 
	{
		button = this.GetComponent<Button>();
		image = this.GetComponent<Image>();
		//添加监听
		EventTriggerListener.Get(button.gameObject).onClick =OnButtonClick;
		EventTriggerListener.Get(image.gameObject).onClick =OnButtonClick;
		//取消监听
		// Destroy(EventTriggerListener.Get(image.gameObject).GetComponent()); 
	}
 
	private void OnButtonClick(GameObject go){
		//在这里监听按钮的点击事件
		if(go == button.gameObject){
			Debug.Log ("DoSomeThings");
		}
	}
}