Unity3D之UI的事件挂载

一 , Scene设计

 

二, 代码

代码全挂在统一的地方, 如Canvas上(本篇如此作)

[RequireComponent(typeof(EventTrigger))]//GO 必须挂载EventTrigger

 

三, Button的onClick的挂载方案

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class CanvasJS : MonoBehaviour
{
    private Button btnGo;
    private Image book;

    private void Start()
    {
        this.btnGo = this.transform.Find("Button").GetComponent<Button>();
        this.book = this.transform.Find("Image").GetComponent<Image>();
        this.AddEvent();
    }

    private void OnDestroy() {
        this.RemoveEvent();
    }
    #region 第一种方式
    private void AddEvent()
    {
        this.btnGo.onClick.AddListener(this.GoHandledr);
    }

    private void RemoveEvent()
    {
        this.btnGo.onClick.RemoveListener(this.GoHandledr);
    }

    private void GoHandledr()
    {
        Debug.Log("1 , 我被触发了!");
    }
    #endregion
}

 

四, EventTrigger的方式 (Button / Image 均可以)

在 Button 和 Image 上挂载 EventTrigger

代码:

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class EventTri : MonoBehaviour
{
    private Button btnGo;
    private Image book;
    private void Start()
    {
        this.btnGo = this.transform.Find("Button").GetComponent<Button>();
        this.book = this.transform.Find("Image").GetComponent<Image>();

        this.AddEvent(this.btnGo.gameObject, this.OnBtnClick);
        this.AddEvent(this.book.gameObject, this.OnImgClick);
    }

    private void AddEvent(GameObject go, UnityAction<BaseEventData> listener)
    {
        EventTrigger trigger = go.GetComponent<EventTrigger>();
        EventTrigger.Entry entry = new EventTrigger.Entry
        {
            eventID = EventTriggerType.PointerClick,
            callback = new EventTrigger.TriggerEvent()
        };
        entry.callback.AddListener(listener);
        trigger.triggers.Add(entry);
    }

    private void RemoveEvent(GameObject go)
    {
        EventTrigger trigger = go.GetComponent<EventTrigger>();
        trigger.triggers.Clear();
    }

    private void OnBtnClick(BaseEventData pointData)
    {
        Debug.Log("Btn");
    }

    private void OnImgClick(BaseEventData pointData)
    {
        Debug.Log("Img");
    }
}

 

五, 扩展 EventTrigger类

Ⅰ, 扩展EventTrigger

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;
public class EventTriggerListener : UnityEngine.EventSystems.EventTrigger
{
    public delegate void VoidDelegate(GameObject go);
    public VoidDelegate onClick;
    public VoidDelegate onDown;
    public VoidDelegate onEnter;
    public VoidDelegate onExit;
    public VoidDelegate onUp;
    public VoidDelegate onSelect;
    public VoidDelegate onUpdateSelect;

    static public EventTriggerListener Get(GameObject go)
    {
        EventTriggerListener listener = go.GetComponent<EventTriggerListener>();
        if (listener == null) listener = go.AddComponent<EventTriggerListener>();
        return listener;
    }
    public override void OnPointerClick(PointerEventData eventData)
    {
        if (onClick != null) onClick(gameObject);
    }
    public override void OnPointerDown(PointerEventData eventData)
    {
        if (onDown != null) onDown(gameObject);
    }
    public override void OnPointerEnter(PointerEventData eventData)
    {
        if (onEnter != null) onEnter(gameObject);
    }
    public override void OnPointerExit(PointerEventData eventData)
    {
        if (onExit != null) onExit(gameObject);
    }
    public override void OnPointerUp(PointerEventData eventData)
    {
        if (onUp != null) onUp(gameObject);
    }
    public override void OnSelect(BaseEventData eventData)
    {
        if (onSelect != null) onSelect(gameObject);
    }
    public override void OnUpdateSelected(BaseEventData eventData)
    {
        if (onUpdateSelect != null) onUpdateSelect(gameObject);
    }
}

Ⅱ, Canvas 的代码

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class ExTrigger : MonoBehaviour
{
    private Button btnGo;
    private Image book;

    private void Start()
    {
        this.btnGo = this.transform.Find("Button").GetComponent<Button>();
        this.book = this.transform.Find("Image").GetComponent<Image>();

        this.AddEvent();
    }

    private void AddEvent()
    {
        EventTriggerListener.Get(this.btnGo.gameObject).onClick = this.OnClickHandler;
        EventTriggerListener.Get(this.book.gameObject).onClick = this.OnClickHandler;
    }

    private void RemoveEvent()
    {
        EventTriggerListener.Get(this.btnGo.gameObject).onClick -= this.OnClickHandler;
        EventTriggerListener.Get(this.book.gameObject).onClick -= this.OnClickHandler;
    }

    private void OnClickHandler(GameObject go)
    {
        if (go == this.btnGo.gameObject)
        {
            Debug.Log("Btn");
            return;
        }
        if (go == this.book.gameObject)
        {
            Debug.Log("Img");
            return;
        }
    }

}