事件接口

将含改代码的脚本挂到UI上，可实现相应效果

第一种写法

using UnityEngine;
using UnityEngine.EventSystems;


public class Juse : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler,IPointerClickHandler,IPointerDownHandler,IPointerUpHandler
{
    public void OnPointerClick(PointerEventData eventData)
    {
        Debug.Log("Click");
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        Debug.Log("Down");
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        Debug.Log("Up");
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        Debug.Log("Enter");
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        Debug.Log("Exit");
    }
}

　　

第二种写法

using UnityEngine;
using UnityEngine.EventSystems;


public class Juse : EventTrigger
{
    public override void OnBeginDrag(PointerEventData data)
    {
        Debug.Log("OnBeginDrag called.");
    }

    public override void OnCancel(BaseEventData data)
    {
        Debug.Log("OnCancel called.");
    }

    public override void OnDeselect(BaseEventData data)
    {
        Debug.Log("OnDeselect called.");
    }

    public override void OnDrag(PointerEventData data)
    {
        Debug.Log("OnDrag called.");
    }

    public override void OnDrop(PointerEventData data)
    {
        Debug.Log("OnDrop called.");
    }

    public override void OnEndDrag(PointerEventData data)
    {
        Debug.Log("OnEndDrag called.");
    }

    public override void OnInitializePotentialDrag(PointerEventData data)
    {
        Debug.Log("OnInitializePotentialDrag called.");
    }

    public override void OnMove(AxisEventData data)
    {
        Debug.Log("OnMove called.");
    }

    public override void OnPointerClick(PointerEventData data)
    {
        Debug.Log("OnPointerClick called.");
    }

    public override void OnPointerDown(PointerEventData data)
    {
        Debug.Log("OnPointerDown called.");
    }

    public override void OnPointerEnter(PointerEventData data)
    {
        Debug.Log("OnPointerEnter called.");
    }

    public override void OnPointerExit(PointerEventData data)
    {
        Debug.Log("OnPointerExit called.");
    }

    public override void OnPointerUp(PointerEventData data)
    {
        Debug.Log("OnPointerUp called.");
    }

    public override void OnScroll(PointerEventData data)
    {
        Debug.Log("OnScroll called.");
    }

    public override void OnSelect(BaseEventData data)
    {
        Debug.Log("OnSelect called.");
    }

    public override void OnSubmit(BaseEventData data)
    {
        Debug.Log("OnSubmit called.");
    }

    public override void OnUpdateSelected(BaseEventData data)
    {
        Debug.Log("OnUpdateSelected called.");
    }
}

　　

第三种写法

using UnityEngine;
using UnityEngine.EventSystems;


public class Juse : EventTrigger
{
    void Start()
    {
        EventTrigger trigger = GetComponent<EventTrigger>();
        EventTrigger.Entry entry = new EventTrigger.Entry();
        entry.eventID = EventTriggerType.PointerDown;
        entry.callback.AddListener((data) => { OnPointerDownDelegate((PointerEventData)data); });
        trigger.triggers.Add(entry);
    }

    public void OnPointerDownDelegate(PointerEventData data)
    {
        Debug.Log("OnPointerDownDelegate called.");
    }
}

　　也可以通过添加EventTrigger组件来调用有关函数。