【UGUI】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
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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");
}
}
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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
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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");
}
}
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