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Unity原生的事件监听与广播系统——UnityEvent

前言

我们在开发Unity程序的过程中会用到事件系统，除了自己开发一套监听与广播系统，也可以使用Unity中原生的监听与广播系统——UnityEvent
Unity官方文档地址：https://docs.unity3d.com/cn/2019.4/ScriptReference/Events.UnityEvent.html

一、示例代码

首先要定义所有的事件，可以写一个事件类
Events.cs

using UnityEngine.Events;[System.Serializable]
 public class Events
 {public UnityEvent zeroParaEvent;public UnityEvent oneParaEvent;public UnityEvent twoParaEvent;public UnityEvent threeParaEvent;
 }
 

然后是事件广播类，在这里触发相应的广播事件

Menu.cs

using UnityEngine;
 using UnityEngine.UI;public class Menu : MonoBehaviour
 {public Button zeroBt;public Button oneBt;public Button twoBt;public Button threeBt;public Events events;private void Start(){zeroBt.onClick.AddListener(() =>{events.zeroParaEvent.Invoke();});oneBt.onClick.AddListener(() =>{int x = 10;events.oneParaEvent.Invoke(x);});twoBt.onClick.AddListener(() =>{int x = 10;string s = "你好呀";events.twoParaEvent.Invoke(x, s);});threeBt.onClick.AddListener(() =>{int x = 10;string s = "你好呀";float f = 12.3f;events.threeParaEvent.Invoke(x, s, f);});}
 }
 

最后是测试类，也是监听事件的地方
Test.cs

using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;public class Test : MonoBehaviour
 {public Menu menu;private void OnEnable(){menu.events.zeroParaEvent.AddListener(ZeroPare);menu.events.oneParaEvent.AddListener(OnePara);menu.events.twoParaEvent.AddListener(TwoPara);menu.events.threeParaEvent.AddListener(ThreePara);}private void OnDisable(){menu.events.zeroParaEvent.RemoveListener(ZeroPare);menu.events.oneParaEvent.RemoveListener(OnePara);menu.events.twoParaEvent.RemoveListener(TwoPara);menu.events.threeParaEvent.RemoveListener(ThreePara);}private void ZeroPare(){Debug.Log("没有参数");}private void OnePara(int x){Debug.Log("一个参数，参数是：" + x);}private void TwoPara(int x, string s){Debug.Log("两个参数，参数是：" + x + "、" + s);}private void ThreePara(int x, string s, float f){Debug.Log("三个参数，参数是：" + x + "、" + s + "、" + f);}
 }
 

二、代码挂载及效果

创建四个按钮

挂载脚本，实例化按钮

创建一个空物体，将Test.cs挂载

将Menu实例化

运行效果