设计模式-发布与订阅（Unity版本）

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



public static class ObaseverTest
{
     public delegate void EventCallback(Object args);
     static  Dictionary> EventDic = new Dictionary>();

     static bool OnListener(string EventName, EventCallback Callback){
        List Callbacks = null;
         if(!EventDic.TryGetValue(EventName,out Callbacks))
        {
            Callbacks = new List();
            EventDic.Add(EventName, Callbacks);
        }
        Callbacks.Add(Callback);
        return true;
    }
    static void OffListener(string eventName, EventCallback listener)
    {
 
        List listeners = null;
        if (EventDic.TryGetValue(eventName, out listeners))
        {
            listeners.Remove(listener);
            if (listeners.Count <= 0)
            {
                EventDic.Remove(eventName);

            }
        }
    }
    static void EmitEvent(string EventName, Object args)
    {
        if (!EventDic.ContainsKey(EventName)) return;
        List events = null;
        if (EventDic.TryGetValue(EventName, out events))
        {
           foreach(EventCallback temp in events){
                temp(args);
            }
        }
    }
}