Unity高度解耦和（事件的监听与广播系统）学习记录

1.原理：使用委托，事件的监听与广播调用一个委托

2.如何使用事件的广播与监听系统

CallBack类：定义委托的类，定义的委托分别为无参的，一个参数，两个参数，三个参数，四个参数，五个参数的类。这个类相当于c#提供的Action类

public delegate void CallBack();
public delegate void CallBack<T>(T arg);
public delegate void CallBack<T, X>(T arg1, X arg2);
public delegate void CallBack<T, X, Y>(T arg1, X arg2, Y arg3);
public delegate void CallBack<T, X, Y, Z>(T arg1, X arg2, Y arg3, Z arg4);
public delegate void CallBack<T, X, Y, Z, W>(T arg1, X arg2, Y arg3, Z arg4, W arg5);

EventDefine类：存放事件码的一个类，他是一个枚举类型。根据实际的开发需求来添加自定义事件码

 EventCenter类：处理不同参数事件的监听，移除监听和广播。

public class EventCenter
{
    private static Dictionary<EventDefine, Delegate> m_EventTable = new Dictionary<EventDefine, Delegate>();

    private static void OnListenerAdding(EventDefine eventType, Delegate callBack)
    {
        if (!m_EventTable.ContainsKey(eventType))
        {
            m_EventTable.Add(eventType, null);
        }
        Delegate d = m_EventTable[eventType];
        if (d != null && d.GetType() != callBack.GetType())
        {
            throw new Exception(string.Format("尝试为事件{0}添加不同类型的委托，当前事件所对应的委托是{1}，要添加的委托类型为{2}", eventType, d.GetType(), callBack.GetType()));
        }
    }
    private static void OnListenerRemoving(EventDefine eventType, Delegate callBack)
    {
        if (m_EventTable.ContainsKey(eventType))
        {
            Delegate d = m_EventTable[eventType];
            if (d == null) 
            {
                throw new Exception(string.Format("移除监听错误：事件{0}没有对应的委托", eventType));
            }
            else if (d.GetType() != callBack.GetType())
            {
                throw new Exception(string.Format("移除监听错误：尝试为事件{0}移除不同类型的委托，当前委托类型为{1}，要移除的委托类型为{2}", eventType, d.GetType(), callBack.GetType()));
            }
        }
        else
        {
            throw new Exception(string.Format("移除监听错误：没有事件码{0}", eventType));
        }
    }
    private static void OnListenerRemoved(EventDefine eventType)
    {
        if (m_EventTable[eventType] == null)
        {
            m_EventTable.Remove(eventType);
        }
    }
    //no parameters
    public static void AddListener(EventDefine eventType, CallBack callBack)
    {
        OnListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack)m_EventTable[eventType] + callBack;
    }
    //Single parameters
    public static void AddListener<T>(EventDefine eventType, CallBack<T> callBack)
    {
        OnListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T>)m_EventTable[eventType] + callBack;
    }
    //two parameters
    public static void AddListener<T, X>(EventDefine eventType, CallBack<T, X> callBack)
    {
        OnListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X>)m_EventTable[eventType] + callBack;
    }
    //three parameters
    public static void AddListener<T, X, Y>(EventDefine eventType, CallBack<T, X, Y> callBack)
    {
        OnListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y>)m_EventTable[eventType] + callBack;
    }
    //four parameters
    public static void AddListener<T, X, Y, Z>(EventDefine eventType, CallBack<T, X, Y, Z> callBack)
    {
        OnListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y, Z>)m_EventTable[eventType] + callBack;
    }
    //five parameters
    public static void AddListener<T, X, Y, Z, W>(EventDefine eventType, CallBack<T, X, Y, Z, W> callBack)
    {
        OnListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y, Z, W>)m_EventTable[eventType] + callBack;
    }

    //no parameters
    public static void RemoveListener(EventDefine eventType, CallBack callBack)
    {
        OnListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack)m_EventTable[eventType] - callBack;
        OnListenerRemoved(eventType);
    }
    //single parameters
    public static void RemoveListener<T>(EventDefine eventType, CallBack<T> callBack)
    {
        OnListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T>)m_EventTable[eventType] - callBack;
        OnListenerRemoved(eventType);
    }
    //two parameters
    public static void RemoveListener<T, X>(EventDefine eventType, CallBack<T, X> callBack)
    {
        OnListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X>)m_EventTable[eventType] - callBack;
        OnListenerRemoved(eventType);
    }
    //three parameters
    public static void RemoveListener<T, X, Y>(EventDefine eventType, CallBack<T, X, Y> callBack)
    {
        OnListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y>)m_EventTable[eventType] - callBack;
        OnListenerRemoved(eventType);
    }
    //four parameters
    public static void RemoveListener<T, X, Y, Z>(EventDefine eventType, CallBack<T, X, Y, Z> callBack)
    {
        OnListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y, Z>)m_EventTable[eventType] - callBack;
        OnListenerRemoved(eventType);
    }
    //five parameters
    public static void RemoveListener<T, X, Y, Z, W>(EventDefine eventType, CallBack<T, X, Y, Z, W> callBack)
    {
        OnListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y, Z, W>)m_EventTable[eventType] - callBack;
        OnListenerRemoved(eventType);
    }


    //no parameters
    public static void Broadcast(EventDefine eventType)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack callBack = d as CallBack;
            if (callBack != null)
            {
                callBack();
            }
            else
            {
                throw new Exception(string.Format("广播事件错误：事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }
    //single parameters
    public static void Broadcast<T>(EventDefine eventType, T arg)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T> callBack = d as CallBack<T>;
            if (callBack != null)
            {
                callBack(arg);
            }
            else
            {
                
                throw new Exception(string.Format("广播事件错误：事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }
    //two parameters
    public static void Broadcast<T, X>(EventDefine eventType, T arg1, X arg2)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T, X> callBack = d as CallBack<T, X>;
            if (callBack != null)
            {
                callBack(arg1, arg2);
            }
            else
            {
                throw new Exception(string.Format("广播事件错误：事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }
    //three parameters
    public static void Broadcast<T, X, Y>(EventDefine eventType, T arg1, X arg2, Y arg3)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T, X, Y> callBack = d as CallBack<T, X, Y>;
            if (callBack != null)
            {
                callBack(arg1, arg2, arg3);
            }
            else
            {
                throw new Exception(string.Format("广播事件错误：事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }
    //four parameters
    public static void Broadcast<T, X, Y, Z>(EventDefine eventType, T arg1, X arg2, Y arg3, Z arg4)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T, X, Y, Z> callBack = d as CallBack<T, X, Y, Z>;
            if (callBack != null)
            {
                callBack(arg1, arg2, arg3, arg4);
            }
            else
            {
                throw new Exception(string.Format("广播事件错误：事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }
    //five parameters
    public static void Broadcast<T, X, Y, Z, W>(EventDefine eventType, T arg1, X arg2, Y arg3, Z arg4, W arg5)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T, X, Y, Z, W> callBack = d as CallBack<T, X, Y, Z, W>;
            if (callBack != null)
            {
                callBack(arg1, arg2, arg3, arg4, arg5);
            }
            else
            {
                throw new Exception(string.Format("广播事件错误：事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }
}

 具体使用的方法：首先要在Awkae或者Start方法中调用 EventCenter类中的AddListener方法添加监听，代码如下所示

 EventDefine.ShowLoginPanel就是我们的事件码，Show就是要传递委托方法，如果方法有参数，要添加相对应类型的泛型，如下所示

 要在OnDestroy方法中调用EventCenter类中的ReMoveListener方法移除监听，代码如下所示

 注意：如果不对监听进行移除的话，后期会出现错误！！！

在其他类中使用UpdateCoinCount方法，只需要在这个类中广播EventDefine.UpdateCoinCount这个事件码就行了，代码如下所示：

 下面举个例子来看看在实际开发中的使用，要实现点击注册按钮，在屏幕上提示注册结果，上代码

 public float hintShowTime = 2f;
    private Text hintText;
    private Color color;

    private void Awake()
    {
        EventCenter.AddListener<string>(EventDefine.Hint, Show);
        hintText = GetComponent<Text>();
        color = hintText.color;
    }
    private void OnDestroy()
    {
        EventCenter.RemoveListener<string>(EventDefine.Hint, Show);
    }
    private void Show(string text)
    {
        hintText.text = text;
        hintText.DOColor(new Color(color.r, color.g, color.b, 1), 0.3f).OnComplete(() =>
        {
            StartCoroutine(Dealy());
        });
    }
    IEnumerator Dealy()
    {
        yield return new WaitForSeconds(hintShowTime);
        hintText.DOColor(new Color(color.r, color.g, color.b, 0), 0.3f);
    }

项目部分代码

 private void Register_SRES(int value)
    {
        if (value == -1)
        {
            //事件广播，提示注册结果
            EventCenter.Broadcast(EventDefine.Hint, "用户名已被注册");
            return;
        }
        if (value == 0)
        {
            EventCenter.Broadcast(EventDefine.Hint, "注册成功");
        }
    }

结果如下：

 

以上是我的学习内容的整理，这个系统总体来说比较简单，但解决了项目开发中的代码耦合性。