unity事件系統（廣播系統）的學習筆記

最近在研究廣播系統，寫下來記錄一下，好記性不如爛筆頭。簡單寫了無參數廣播事件系統

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


public delegate void CallBack();//需要有參數的直接在這加上需要的參數就可以實現參數廣播。
public enum EventTypee//廣播事件
{
    test
}
public class EventCenter : MonoBehaviour
{
    private static Dictionary<EventTypee, Delegate> dic = new Dictionary<EventTypee, Delegate>();
    /// <summary>
    /// 添加事件監聽
    /// </summary>
    /// <param name="eventType"></param>
    /// <param name="callBack"></param>
    public static void AddListener(EventTypee eventTypee,CallBack callBack)
    {
        if (!dic.ContainsKey(eventTypee))
        {
            dic.Add(eventTypee, null);
        }
        //異常拋出
        Delegate m = dic[eventTypee];
        if (m != null && m.GetType() != callBack.GetType())
        {
            throw new Exception(string.Format("事件{0}爲不同委託，對應爲{1}，添加類型爲{2}", eventTypee, m.GetType(), callBack.GetType()));
        }
        dic[eventTypee] = (CallBack)dic[eventTypee] + callBack;
        
    }
    /// <summary>
    /// 移除監聽事件
    /// </summary>
    /// <param name="eventTypee"></param>
    /// <param name="callBack"></param>
    public static void RemoveListener(EventTypee eventTypee,CallBack callBack)
    {
        //異常拋出
        if (dic.ContainsKey(eventTypee))
        {
            Delegate m = dic[eventTypee];
            if(m == null)
            {
                throw new Exception(string.Format("錯誤；事件{0}沒有添加", eventTypee));
            }
            else if (m.GetType()!= callBack.GetType())
            {
                throw new Exception(string.Format("移除錯誤，事件{0}於事件{1}爲不同委託", m.GetType(), callBack.GetType()));
            }
            
        }
        else
        {
            throw new Exception(string.Format("錯誤，沒有事件{0}", eventTypee));
        }
        dic[eventTypee] = (CallBack)dic[eventTypee] - callBack;
        if (dic[eventTypee] == null)
        {
            dic.Remove(eventTypee);
        }
    }
    /// <summary>
    /// 事件的廣播
    /// </summary>
    /// <param name="eventTypee"></param>
    public static void Broadcast(EventTypee eventTypee)
    {
        Delegate m;
        if (dic.TryGetValue(eventTypee, out m))
        {
            CallBack callBack = m as CallBack;
            if(callBack != null)
            {
                callBack();
            }
            else
            {
                throw new Exception(string.Format("錯誤，事件已存在", eventTypee));
            }
        }
    }
}

測試一下

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

public class NewBehaviourScript : MonoBehaviour
{
        
    private void Awake()
    {
        EventCenter.AddListener(EventTypee.test, Show1);
    }
   
    private void Show1()
    {
        Debug.Log("廣播成功");
    }
   
    private void OnDestroy()
    {
        EventCenter.RemoveListener(EventTypee.test, Show1);
    }
    public void OnShowBtnClick()
    {
        EventCenter.Broadcast(EventTypee.test);
    }
}