Unity事件管理器

一、訴求

在Unity中，當程序比較龐大時，各個類之間的方法調用就會變的很麻煩。所以這個時候需要一個事件管理器，可以很方便地進行事件之間的調用，同時可以很大程度地解決程序的耦合性。

二、創建事件管理器

1.首先聲明一個單例類 GMEventManager ，並賦值所需屬性

    private static GMEventManager eventDispatcher = new GMEventManager();
    public static GMEventManager Instance
    {
        get
        {
            return eventDispatcher;
        }
    }

    public delegate void EventDelegate(object[] args);
    private Dictionary<GMEventType, Dictionary<int, List<EventDelegate>>> eventListeners = new Dictionary<GMEventType, Dictionary<int, List<EventDelegate>>>();

2.創建事件類型枚舉

public enum GMEventType
{
    EventA,
    EventB,
    EventC,
}

3.添加事件方法

    /// <summary>
    /// 添加事件監聽/
    /// <param name="eventType"></param>
    /// <param name="eventDelegate"></param>
    /// </summary>
    public void AddEvent(GMEventType eventType, EventDelegate eventDelegate)
    {
        AddSubEvent(eventType, -1, eventDelegate);
    }

    /// <summary>
    /// 添加事件監聽/
    /// <param name="eventType"></param>
    /// <param name="subType">子事件</param>
    /// <param name="eventDelegate"></param>
    /// </summary>
    public void AddSubEvent(GMEventType eventType, int subType, EventDelegate eventDelegate)
    {
        Dictionary<int, List<EventDelegate>> tempEventList = null;
        if (eventListeners.TryGetValue(eventType, out tempEventList))
        {
            List<EventDelegate> eventlist = null;
            if (!tempEventList.TryGetValue(subType, out eventlist))
            {
                eventlist = new List<EventDelegate>();
                eventlist.Add(eventDelegate);
                tempEventList.Add(subType, eventlist);
            }
            else
            {
                if (!eventlist.Contains(eventDelegate))
                {
                    eventlist.Add(eventDelegate);
                }
            }
        }
        else
        {
            tempEventList = new Dictionary<int, List<EventDelegate>>();
            List<EventDelegate> eventlist = new List<EventDelegate>();
            eventlist.Add(eventDelegate);
            tempEventList.Add(subType, eventlist);
            eventListeners.Add(eventType, tempEventList);
        }
    }

4.移除事件方法

    /// <summary>
    /// 移除事件監聽/
    /// </summary>
    /// <param name="eventType"></param>
    /// <param name="eventDelegate"></param>
    public void RemoveEvent(GMEventType eventType, EventDelegate eventDelegate)
    {
        RemoveSubEvent(eventType, -1, eventDelegate);
    }
    /// <summary>
    /// 移除事件監聽/
    /// </summary>
    /// <param name="eventType"></param>
    /// <param name="subType">子事件</param>
    /// <param name="eventDelegate"></param>
    public void RemoveSubEvent(GMEventType eventType, int subType, EventDelegate eventDelegate)
    {
        Dictionary<int, List<EventDelegate>> tempEventList = null;
        if (eventListeners.TryGetValue(eventType, out tempEventList))
        {
            List<EventDelegate> eventlist;
            if (tempEventList.TryGetValue(subType, out eventlist))
            {
                eventlist.Remove(eventDelegate);
            }
        }
    }

5.執行與移除事件

    /// <summary>
    /// 執行事件
    /// </summary>
    /// <param name="strEventName">事件名稱</param>
    /// <param name="strParam">事件參數</param>
    public void ExecuteEvent(GMEventType eventType, params object[] args)
    {
        ExecuteSubEvent(eventType, -1, args);
    }
    /// <summary>
    /// 執行事件
    /// </summary>
    /// <param name="eventType">事件名稱</param>
    /// <param name="subType">子事件</param>
    /// <param name="args">事件參數</param>
    public void ExecuteSubEvent(GMEventType eventType, int subType, params object[] args)
    {
        Dictionary<int, List<EventDelegate>> tempEventList = null;
        if (eventListeners.TryGetValue(eventType, out tempEventList))
        {
            List<EventDelegate> eventList = null;
            if (subType < 0)
            {
                foreach (var item in tempEventList)
                {
                    if (item.Value != null)
                    {
                        foreach (var value in item.Value)
                        {
                            if (value != null)
                            {
                                value.Invoke(args);
                            }
                        }
                    }
                }
            }
            else if (tempEventList.TryGetValue(subType, out eventList))
            {
                foreach (var value in eventList)
                {
                    if (value != null)
                    {
                        value.Invoke(args);
                    }
                }
            }

        }
    }

    /// <summary>
    /// 清空事件
    /// </summary>
    public void Clear()
    {
        eventListeners.Clear();
    }

這樣一個事件管理類就寫好了。

三、應用

1.在實現邏輯添加事件方法

    private void OnEnable()
    {
        GMEventManager.Instance.AddEvent(GMEventType.EventA, DoEventA);
    }

    private void OnDisable()
    {
        GMEventManager.Instance.RemoveEvent(GMEventType.EventA, DoEventA);
    }

    private void DoEventA(object[] args)
    {
        if(args.Length > 0)
        {
            for (int i = 0; i < args.Length; i++)
            {
                Debug.Log(args[i]);
            }
        }
    }

2.調用事件

    public void DoA()
    {
        GMEventManager.Instance.ExecuteEvent(GMEventType.EventA, "Are you ok?", "I am fine!");
    }

3.運行結果