unity消息系统机制，工具类可以直接使用

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转自：http://www.manew.com/blog-117699-43032.html

在开发Unity的时候，为了方便开发一般都会采用消息事件，消息事件主要是做啥的？我们如何去封装，如何去运用消息事件处理事情。接下来就给大家介绍一下：

消息事件顾名思义，是通过消息触发的事件。比如大家去完成某个任务，完成后才会触发另一个事件的发生，这种情况我们就会使用消息事件等等吧。

消息事件的使用主要是通过添加消息监听，然后分发消息处理事情。

那我们如何去封装我们的消息系统，在这里我把代码给大家分享一下：

1.首先我们封装消息事件的基类CBaseEvent.cs

using System.Collections;using System.Collections.Generic;using UnityEngine;public enum CEventType{    GAME_OVER,    GAME_WIN,    PAUSE,    GAME_DATA,}public class CBaseEvent{    protected Hashtable arguments;    protected CEventType type;    protected object sender;    protected string eventName;    public CEventType Type    {        get        {            return this.type;        }        set        {            this.type = value;        }    }    public IDictionary Params    {        get        {            return this.arguments;        }        set        {            this.arguments = (value as Hashtable);        }    }    public object Sender    {        get        {            return this.sender;        }        set        {            this.sender = value;        }    }    public string EventName    {        get        {            return eventName;        }        set        {            eventName = value;        }    }    public override string ToString()    {        return this.type + " { " + ((this.sender == null) ? "null" : this.sender.ToString()) + " } ";    }    public CBaseEvent Clone()    {        return new CBaseEvent(this.type, this.arguments, Sender);    }    public CBaseEvent(CEventType type, object sender)    {        this.Type = type;        Sender = sender;        if (this.arguments == null)        {            this.arguments = new Hashtable();        }    }    public CBaseEvent(CEventType type, Hashtable args, object sender)    {        this.Type = type;        this.arguments = args;        Sender = sender;        if (this.arguments == null)        {            this.arguments = new Hashtable();        }    }    public CBaseEvent(string eventName, object sender)    {        this.EventName = eventName;        Sender = sender;        if (this.arguments == null)        {            this.arguments = new Hashtable();        }    }}

2.以上是消息基类的定义。那接下来就是封装对外使用的消息接口了。写一个新的类CEventDispatcher

using System;using System.Collections;using System.Collections.Generic;using UnityEngine;public delegate void CEventListenerDelegate(CBaseEvent evt);public class CEventDispatcher{    static CEventDispatcher instance;    public static CEventDispatcher GetInstance()    {        if (instance == null)        {            instance = new CEventDispatcher();        }        return instance;    }    private Hashtable listeners = new Hashtable();    public void AddEventListener(CEventType eventType, CEventListenerDelegate listener)    {        CEventListenerDelegate ceventListenerDelegate = this.listeners[eventType] as CEventListenerDelegate;        ceventListenerDelegate = (CEventListenerDelegate)Delegate.Combine(ceventListenerDelegate, listener);        this.listeners[eventType] = ceventListenerDelegate;    }    public void RemoveEventListener(CEventType eventType, CEventListenerDelegate listener)    {        CEventListenerDelegate ceventListenerDelegate = this.listeners[eventType] as CEventListenerDelegate;        if (ceventListenerDelegate != null)        {            ceventListenerDelegate = (CEventListenerDelegate)Delegate.Remove(ceventListenerDelegate, listener);        }        this.listeners[eventType] = ceventListenerDelegate;    }    public void AddEventListener(string eventName, CEventListenerDelegate listener)    {        CEventListenerDelegate ceventListenerDelegate = this.listeners[eventName] as CEventListenerDelegate;        //这个combine就相当于委托的+=    (整体的实现就是类似于观察者模式)        ceventListenerDelegate = (CEventListenerDelegate)Delegate.Combine(ceventListenerDelegate, listener);        this.listeners[eventName] = ceventListenerDelegate;    }    public void RemoveEventListener(string eventName, CEventListenerDelegate listener)    {        CEventListenerDelegate ceventListenerDelegate = this.listeners[eventName] as CEventListenerDelegate;        if (ceventListenerDelegate != null)        {            ceventListenerDelegate = (CEventListenerDelegate)Delegate.Remove(ceventListenerDelegate, listener);        }        this.listeners[eventName] = ceventListenerDelegate;    }    public void DispatchEventOnce(CBaseEvent evt)    {        CEventListenerDelegate ceventListenerDelegate;        if (string.IsNullOrEmpty(evt.EventName))        {            ceventListenerDelegate = this.listeners[evt.Type] as CEventListenerDelegate;        }        else        {            ceventListenerDelegate = this.listeners[evt.EventName] as CEventListenerDelegate;        }        if (ceventListenerDelegate != null)        {            try            {                ceventListenerDelegate(evt);                if (string.IsNullOrEmpty(evt.EventName))                {                    this.listeners.Remove(evt.Type);                }                else                {                    this.listeners.Remove(evt.EventName);                }            }            catch (Exception ex)            {                throw new Exception(string.Concat(new string[]                {                    "Error dispatching event ",                    evt.Type.ToString(),                    ": ",                    ex.Message,                    " ",                    ex.StackTrace                }), ex);            }        }    }    ///     /// 使用枚举传递    /// 
    ///     public void DispatchEvent(CBaseEvent evt)    {        CEventListenerDelegate ceventListenerDelegate = this.listeners[evt.Type] as CEventListenerDelegate;        if (ceventListenerDelegate != null)        {            try            {                ceventListenerDelegate(evt);            }            catch (Exception ex)            {                throw new Exception(string.Concat(new string[]                {                    "Error dispatching event ",                    evt.Type.ToString(),                    ": ",                    ex.Message,                    " ",                    ex.StackTrace                }), ex);            }        }    }    ///     /// 使用字符串传递    /// 
    ///     public void DispatchStringEvent(CBaseEvent evt)    {        CEventListenerDelegate ceventListenerDelegate = this.listeners[evt.EventName] as CEventListenerDelegate;        if (ceventListenerDelegate != null)        {            try            {                ceventListenerDelegate(evt);            }            catch (Exception ex)            {                throw new Exception(string.Concat(new string[]                {                    "Error dispatching event ",                    evt.Type.ToString(),                    ": ",                    ex.Message,                    " ",                    ex.StackTrace                }), ex);            }        }    }    public void RemoveAll()    {        this.listeners.Clear();    }}

3.一共就这2个类就可以了，接下来是使用方法

using UnityEngine;using System.Collections;public class TestEvent : MonoBehaviour {// Use this for initializationvoid Start () {        CEventDispatcher.GetInstance().AddEventListener("开始触发", MyTestFunc);        CEventDispatcher.GetInstance().AddEventListener(CEventType.GAME_WIN, MyTestFunc);        CEventDispatcher.GetInstance().DispatchEventOnce(new CBaseEvent("开始触发","第一次"));        CEventDispatcher.GetInstance().DispatchStringEvent(new CBaseEvent("开始触发", "第三次"));        CEventDispatcher.GetInstance().DispatchEvent(new CBaseEvent(CEventType.GAME_WIN, "事件类型"));    }    void MyTestFunc(CBaseEvent evt)    {        Debug.Log("触发了该方法："+ evt.Sender.ToString());    }}

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