UGUI脚本添加Btn回调的方法

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.UI;

using UnityEngine.EventSystems;

//对添加这个脚本的对象添加EventTrigger组件

[RequireComponent(typeof(UnityEngine.EventSystems.EventTrigger))]

public class BtnPointClick : MonoBehaviour {

    Button btn;

    EventTrigger.Entry beginClick;

    EventTrigger.Entry pointClick;

    EventTrigger.Entry endClick;

    EventTrigger eventTrigger;

    void Awake()

    {

        btn = this.GetComponent<Button>();

        eventTrigger = this.GetComponent<EventTrigger>();

        beginClick = new EventTrigger.Entry();

        pointClick = new EventTrigger.Entry();

        endClick = new EventTrigger.Entry();

    }

	void Start () {

        beginClick.eventID = EventTriggerType.PointerDown;

        pointClick.eventID = EventTriggerType.PointerClick;

        endClick.eventID = EventTriggerType.PointerUp;

        //注册事件回调

        beginClick.callback = new EventTrigger.TriggerEvent();

        pointClick.callback = new EventTrigger.TriggerEvent();

        endClick.callback = new EventTrigger.TriggerEvent();

        //添加事件监听

        beginClick.callback.AddListener(BeginClickEvent);

        pointClick.callback.AddListener(PointClickEvent);

        endClick.callback.AddListener(EndClickEvent);

        //添加事件到委托事件

        eventTrigger.triggers.Add(beginClick);

        eventTrigger.triggers.Add(pointClick);

        eventTrigger.triggers.Add(endClick);

    }

    /// <summary>

    /// 开始点击的事件回调

    /// </summary>

    /// <param name="data"></param>

    private void BeginClickEvent(BaseEventData data)

    {

        Debug.Log("开始点击");

    }

    /// <summary>

    /// 点击的事件回调

    /// </summary>

    /// <param name="data"></param>

    private void PointClickEvent(BaseEventData data)

    {

        Debug.Log("点击事件");

    }

    /// <summary>

    /// 鼠标抬起的事件回调

    /// </summary>

    /// <param name="data"></param>

    private void EndClickEvent(BaseEventData data)

    {

        Debug.Log("鼠标抬起事件");

    }

}