Unity3D 消息通知类

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using System;
using System.Collections.Generic;

/// <summary>
/// 消息通知中心.
/// </summary>
public class NotificationCenter
{
    private static NotificationCenter _instance;

    /// <summary>
    /// 获取单例.
    /// </summary>
    public static NotificationCenter GetInstance()
    {
        if(_instance == null)
        {
            _instance = new NotificationCenter();
        }
        return _instance;
    }

    private Dictionary<string, Notifier> _eventMap;

    /// <summary>
    /// 构造函数.
    /// </summary>
    private NotificationCenter()
    {
        _eventMap = new Dictionary<string, Notifier>();
    }

    /// <summary>
    /// 添加一个消息监听.
    /// </summary>
    /// <param name="name">消息名称.</param>
    /// <param name="handler">监听方法.</param>
    public void AddNotificationHandler(string name, EventHandler handler)
    {
        if(!_eventMap.ContainsKey(name))
        {
            _eventMap[name] = new Notifier();
        }
        _eventMap[name].AddEventHandler(handler);
    }

    /// <summary>
    /// 发送一个消息.
    /// </summary>
    /// <param name="name">消息名称.</param>
    public void SendNotification(string name)
    {
        this.SendNotification(name, null, EventArgs.Empty);
    }

    /// <summary>
    /// 发送一个消息.
    /// </summary>
    /// <param name="name">消息名称.</param>
    /// <param name="sender">消息发送者.</param>
    public void SendNotification(string name, object sender)
    {
        this.SendNotification(name, sender, EventArgs.Empty);
    }

    /// <summary>
    /// 发送一个消息.
    /// </summary>
    /// <param name="name">消息名称.</param>
    /// <param name="sender">消息发送者.</param>
    /// <param name="eventArgs">消息参数.</param>
    public void SendNotification(string name, object sender, EventArgs eventArgs)
    {
        if(_eventMap.ContainsKey(name))
        {
            _eventMap[name].Execute(sender, eventArgs);
        }
    }

    /// <summary>
    /// 移除一个消息监听.
    /// </summary>
    /// <param name="name">消息名称.</param>
    /// <param name="handler">监听方法.</param>
    public void RemoveNotificationHandler(string name, EventHandler handler)
    {
        if(_eventMap.ContainsKey(name))
        {
            _eventMap[name].RemoveEventHandler(handler);
        }
    }

    /// <summary>
    /// 如果一个特定名称的消息已经不会再使用同时没有任何监听, 可以调用该方法清除其占用的内存.
    /// </summary>
    /// <param name="name">消息名称.</param>
    public void ClearNotificationByName(string name)
    {
        if(_eventMap.ContainsKey(name))
        {
            _eventMap.Remove(name);
        }
    }
}

/// <summary>
/// 消息发送执行类.
/// </summary>
public class Notifier
{
    private event EventHandler _handler;

    /// <summary>
    /// 构造函数.
    /// </summary>
    public Notifier()
    {
    }

    /// <summary>
    /// 添加一个监听.
    /// </summary>
    /// <param name="handler">监听方法.</param>
    public void AddEventHandler(EventHandler handler)
    {
        _handler += handler;
    }

    /// <summary>
    /// 执行监听.
    /// </summary>
    /// <param name="sender">消息发送者.</param>
    /// <param name="eventArgs">消息参数.</param>
    public void Execute(object sender, EventArgs eventArgs)
    {
        if(_handler != null)
        {
            _handler(sender, eventArgs);
        }
    }

    /// <summary>
    /// 移除一个监听.
    /// </summary>
    /// <param name="handler">监听方法.</param>
    public void RemoveEventHandler(EventHandler handler)
    {
        _handler -= handler;
    }
}