【UGUI】Unity4.6 UI按鈕綁定事件（三）

我們會發現Unity4.6 UI新的UI系統中Button默認只提供了Onclick的調用方法，有時我們不僅僅想監聽Button的Click事件，同時還需要監聽MouseIn（鼠標進入事件）MouseOut（鼠標滑出事件）.
這時我們就需要藉助新的UI系統中EventTrigger腳本來實現，下面我們來學習一下，首先我們看一下如何通過EventTrigger來實現按鈕點擊Click事件.

第一步：通過Hierarchy面板創建button（詳細參考Unity4.6 UI按鈕綁定事件（一））

第二步：創建一個名爲EventHandler的腳本，代碼如下

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using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.EventSystems;   //需要EventTrigger腳本的支援 [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，綁定EventHandler腳本到Button上

然後運行點擊按鈕就能看到運行的結果了。

如果我們想在Unity4.6 新的UI中實現MouseIn怎麼辦，很簡單我們只需要修改下EventTriggerType.PointerClick事件類型改爲EventTriggerType.PointerEnter，同理要監聽MouseOut事件只需要修改爲EventTriggerType.PointerExit

新的實現代碼如下

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using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.EventSystems;   //需要EventTrigger腳本的支援 [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(); //鼠標點擊事件 //entry.eventID = EventTriggerType.PointerClick; //鼠標滑出事件 //entry.eventID = EventTriggerType.PointerExit; //鼠標進入事件 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");   }   }