Unity4.6 UI按钮绑定事件(三)

 

我们会发现Unity4.6 UI新的UI系统中Button默认只提供了Onclick的调用方法,有时我们不仅仅想监听Button的Click事件,同时还需要监听MouseIn(鼠标进入事件)MouseOut(鼠标滑出事件).
这时我们就需要借助新的UI系统中EventTrigger脚本来实现,下面我们来学习一下,首先我们看一下如何通过EventTrigger来实现按钮点击Click事件.

第一步:通过Hierarchy面板创建button(详细参考Unity4.6 UI按钮绑定事件(一))

第二步:创建一个名为EventHandler的脚本,代码如下


using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;

//需要EventTrigger脚本的支援
[RequireComponent(typeof(UnityEngine.EventSystems.EventTrigger))]
public class EventHandler : MonoBehaviour
{

// Use this for initialization
void Start()
{

Button btn = this.GetComponent<Button>();
UnityEngine.EventSystems.EventTrigger trigger = btn.gameObject.GetComponent<UnityEngine.EventSystems.EventTrigger>();
EventTrigger.Entry entry = new EventTrigger.Entry();
entry.eventID = EventTriggerType.PointerClick;
entry.callback = new EventTrigger.TriggerEvent();
entry.callback.AddListener(Onclick);

trigger.delegates.Add(entry);
}

private void Onclick(BaseEventData pointData)
{
Debug.Log("Button Clicked");

}

}

第三步,绑定EventHandler脚本到Button上

然后运行点击按钮就能看到运行的结果了。

如果我们想在Unity4.6 新的UI中实现MouseIn怎么办,很简单我们只需要修改下EventTriggerType.PointerClick事件类型改为EventTriggerType.PointerEnter,同理要监听MouseOut事件只需要修改为EventTriggerType.PointerExit

新的实现代码如下


using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;

//需要EventTrigger脚本的支援
[RequireComponent(typeof(UnityEngine.EventSystems.EventTrigger))]
public class EventHandler : MonoBehaviour
{

// Use this for initialization
void Start()
{

Button btn = this.GetComponent<Button>();
UnityEngine.EventSystems.EventTrigger trigger = btn.gameObject.GetComponent<UnityEngine.EventSystems.EventTrigger>();
EventTrigger.Entry entry = new EventTrigger.Entry();
//鼠标点击事件
//entry.eventID = EventTriggerType.PointerClick;
//鼠标滑出事件
//entry.eventID = EventTriggerType.PointerExit;
//鼠标进入事件
entry.eventID = EventTriggerType.PointerEnter;
entry.callback = new EventTrigger.TriggerEvent();
entry.callback.AddListener(OnMouseEnter);

trigger.delegates.Add(entry);
}

private void OnMouseEnter(BaseEventData pointData)
{
Debug.Log("Button Enter");

}

}