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在Unity 4.6新增的uGUI中，可以方便地对控件，通过添加EventTrigger脚本来进行添加事件。但是里面并没有包括长按事件，需要自己来实现长按事件。
长按事件
以下是一种实现方式，来自《Handling long press events in uGUI (Unity 4.6)》
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
public class LongPressEventTrigger : UIBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler
{
[Tooltip("How long must pointer be down on this object to trigger a long press")]
public float durationThreshold = 1.0f;
public UnityEvent onLongPress = new UnityEvent();
private bool isPointerDown = false;
private bool longPressTriggered = false;
private float timePressStarted;
private void Update()
{
if (isPointerDown && !longPressTriggered)
{
if (Time.time - timePressStarted > durationThreshold)
{
longPressTriggered = true;
onLongPress.Invoke();
}
}
}
public void OnPointerDown(PointerEventData eventData)
{
timePressStarted = Time.time;
isPointerDown = true;
longPressTriggered = false;
}
public void OnPointerUp(PointerEventData eventData)
{
isPointerDown = false;
}
public void OnPointerExit(PointerEventData eventData)
{
isPointerDown = false;
}
}
长按或点击事件
当存在长按事件，又想存在点击事件时，那么就需要判断是否已经执行了长按事件，已经执行了就不能再执行点击事件了，代码如下：
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
public class LongPressOrClickEventTrigger : UIBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler, IPointerClickHandler
{
[Tooltip("How long must pointer be down on this object to trigger a long press")]
public float durationThreshold = 1.0f;
public UnityEvent onLongPress = new UnityEvent();
public UnityEvent onClick = new UnityEvent();
private bool isPointerDown = false;
private bool longPressTriggered = false;
private float timePressStarted;
private void Update()
{
if (isPointerDown && !longPressTriggered)
{
if (Time.time - timePressStarted > durationThreshold)
{
longPressTriggered = true;
onLongPress.Invoke();
}
}
}
public void OnPointerDown(PointerEventData eventData)
{
timePressStarted = Time.time;
isPointerDown = true;
longPressTriggered = false;
}
public void OnPointerUp(PointerEventData eventData)
{
isPointerDown = false;
}
public void OnPointerExit(PointerEventData eventData)
{
isPointerDown = false;
}
public void OnPointerClick(PointerEventData eventData)
{
if (!longPressTriggered)
{
onClick.Invoke();
}
}
}
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