视频地址
http://www.sikiedu.com/my/course/304
平常我们写的一些脚本
比如点击btn然后显示文本或者改变文本文字 一般我们都在Find到或者public把他们关联到一起 这样相互之间的调用会有很高的耦合性
用事件广播监听的话可以做到每个类关联性不那么强 各做各的职责 监听者不用管广播者是谁 广播者不用管监听者是谁
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
/// <summary>
/// 注册码
/// </summary>
public enum eEventType
{
ShowText=0,
}
/// <summary>
/// 事件管理
/// </summary>
public class EventCenter
{
static Dictionary<eEventType, Delegate> m_EventTable = new Dictionary<eEventType, Delegate>();
/// <summary>
/// 无参添加监听的方法
/// </summary>
/// <param name="eventType"></param>
/// <param name="callBack"></param>
public static void AddListener(eEventType eventType, CallBack 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,当前事件对应的的委托是{1},要添加的委托类型是{2}", eventType, d.GetType(), callBack));
}
m_EventTable[eventType] = (CallBack)m_EventTable[eventType] + callBack;
}
/// <summary>
/// 移除无参监听的方法
/// </summary>
/// <param name="eventType"></param>
/// <param name="callBack"></param>
public static void RemoveListener(eEventType eventType, CallBack 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}" +
",要移除的委托的类型为{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));
}
m_EventTable[eventType] = (CallBack)m_EventTable[eventType] - callBack;
}
public static void Broadcast(eEventType 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}对应的委托具有不同类型",eventType));
}
}
}
}
//回调管理
public delegate void CallBack();
public delegate void CallBack<T>(T arg);
下面是测试的Test脚本挂在Test上
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ShowTest : MonoBehaviour
{
public void Awake()
{
EventCenter.AddListener(eEventType.ShowText, Show);
gameObject.SetActive(false);
}
public void OnDestroy()
{
EventCenter.RemoveListener(eEventType.ShowText, Show);
}
public void Show()
{
gameObject.SetActive(true);
}
}
下面是btn脚本挂在btn上
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class BtnOnClick : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
GetComponent<Button>().onClick.AddListener (() => {
EventCenter.Broadcast(eEventType.ShowText);
});
}
}
点击btn Test激活
然后我们加上泛型 和有参数 还有代码优化
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
/// <summary>
/// 注册码
/// </summary>
public enum eEventType
{
ShowText = 0,
}
/// <summary>
/// 事件管理
/// </summary>
public class EventCenter
{
static Dictionary<eEventType, Delegate> m_EventTable = new Dictionary<eEventType, Delegate>();
static void OnListenerAdding(eEventType 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,当前事件对应的的委托是{1},要添加的委托类型是{2}", eventType, d.GetType(), callBack));
}
}
static void OnListenerRemoving(eEventType 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}" +
",要移除的委托的类型为{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));
}
}
static void OnListenerRemoved(eEventType eventType)
{
if (m_EventTable[eventType] == null)
{
m_EventTable.Remove(eventType);
}
}
/// <summary>
/// 无参添加监听的方法
/// </summary>
/// <param name="eventType"></param>
/// <param name="callBack"></param>
public static void AddListener(eEventType eventType, CallBack callBack)
{
OnListenerAdding(eventType, callBack);
m_EventTable[eventType] = (CallBack)m_EventTable[eventType] + callBack;
}
/// <summary>
/// 1参添加监听的方法
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="eventType"></param>
/// <param name="callBack"></param>
public static void AddListener<T>(eEventType eventType, CallBack<T> callBack)
{
OnListenerAdding(eventType, callBack);
m_EventTable[eventType] = (CallBack<T>)m_EventTable[eventType] + callBack;
}
/// <summary>
/// 2参添加监听的方法
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="X"></typeparam>
/// <param name="eventType"></param>
/// <param name="callBack"></param>
public static void AddListener<T,X>(eEventType eventType, CallBack<T,X> callBack)
{
OnListenerAdding(eventType, callBack);
m_EventTable[eventType] = (CallBack<T,X>)m_EventTable[eventType] + callBack;
}
public static void AddListener<T, X ,Y>(eEventType eventType, CallBack<T, X,Y> callBack)
{
OnListenerAdding(eventType, callBack);
m_EventTable[eventType] = (CallBack<T, X,Y>)m_EventTable[eventType] + callBack;
}
public static void AddListener<T, X, Y,Z>(eEventType eventType, CallBack<T, X, Y,Z> callBack)
{
OnListenerAdding(eventType, callBack);
m_EventTable[eventType] = (CallBack<T, X, Y,Z>)m_EventTable[eventType] + callBack;
}
public static void AddListener<T, X, Y, Z,W>(eEventType eventType, CallBack<T, X, Y, Z,W> callBack)
{
OnListenerAdding(eventType, callBack);
m_EventTable[eventType] = (CallBack<T, X, Y, Z,W>)m_EventTable[eventType] + callBack;
}
/// <summary>
/// 移除无参监听的方法
/// </summary>
/// <param name="eventType"></param>
/// <param name="callBack"></param>
public static void RemoveListener(eEventType eventType, CallBack callBack)
{
OnListenerRemoving(eventType, callBack);
m_EventTable[eventType] = (CallBack)m_EventTable[eventType] - callBack;
OnListenerRemoved(eventType);
}
/// <summary>
/// 移除1参监听的方法
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="eventType"></param>
/// <param name="callBack"></param>
public static void RemoveListener<T>(eEventType eventType, CallBack<T> callBack)
{
OnListenerRemoving(eventType, callBack);
m_EventTable[eventType] = (CallBack<T>)m_EventTable[eventType] - callBack;
OnListenerRemoved(eventType);
}
/// <summary>
/// 移除2参监听的方法
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="eventType"></param>
/// <param name="callBack"></param>
public static void RemoveListener<T,X>(eEventType eventType, CallBack<T,X> callBack)
{
OnListenerRemoving(eventType, callBack);
m_EventTable[eventType] = (CallBack<T,X>)m_EventTable[eventType] - callBack;
OnListenerRemoved(eventType);
}
public static void RemoveListener<T, X,Y>(eEventType eventType, CallBack<T, X,Y> callBack)
{
OnListenerRemoving(eventType, callBack);
m_EventTable[eventType] = (CallBack<T, X,Y>)m_EventTable[eventType] - callBack;
OnListenerRemoved(eventType);
}
public static void RemoveListener<T, X, Y,Z>(eEventType eventType, CallBack<T, X, Y,Z> callBack)
{
OnListenerRemoving(eventType, callBack);
m_EventTable[eventType] = (CallBack<T, X, Y,Z>)m_EventTable[eventType] - callBack;
OnListenerRemoved(eventType);
}
public static void RemoveListener<T, X, Y, Z,W>(eEventType 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);
}
/// <summary>
/// 广播无参方法
/// </summary>
/// <param name="eventType"></param>
public static void Broadcast(eEventType 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}对应的委托具有不同类型", eventType));
}
}
}
/// <summary>
/// 广播1参方法
/// </summary>
/// <param name="eventType"></param>
public static void Broadcast<T>(eEventType 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}对应的委托具有不同类型", eventType));
}
}
}
/// <summary>
/// 广播2参方法
/// </summary>
/// <param name="eventType"></param>
public static void Broadcast<T,X>(eEventType 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}对应的委托具有不同类型", eventType));
}
}
}
public static void Broadcast<T, X,Y>(eEventType 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}对应的委托具有不同类型", eventType));
}
}
}
public static void Broadcast<T, X, Y,Z>(eEventType 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}对应的委托具有不同类型", eventType));
}
}
}
public static void Broadcast<T, X, Y, Z,W>(eEventType 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}对应的委托具有不同类型", eventType));
}
}
}
}
//回调管理 不用Action因为自带的最多4个参数
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);
下面测试脚本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class ShowTest : MonoBehaviour
{
public void Awake()
{
EventCenter.AddListener<string,string,float,float,int>(eEventType.ShowText, Show);
gameObject.SetActive(false);
}
public void OnDestroy()
{
EventCenter.RemoveListener<string, string, float, float, int>(eEventType.ShowText, Show);
}
public void Show(string str,string str1,float a,float b,int c)
{
gameObject.SetActive(true);
GetComponent<Text>().text = str+str1+a+b+c;
}
}
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class BtnOnClick : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
GetComponent<Button>().onClick.AddListener (() => {
EventCenter.Broadcast(eEventType.ShowText,"你好","你好呀",1.7f,1.8f,2);
});
}
}
传类也是可以的
缺点
添加和移除与CallBack 的泛型顺序长度必须和方法的参数顺序长度一致 不然会报错
然后广播时候也要监听者的长度和顺序一致
因为注册码和方法一对一的可以这样操作做好标记说明参数信息
这样调用的时候就不用猜或者去翻了