事件/委托机制（event/delegate）（Unity3D开发之十七）

猴子原创，欢迎转载。转载请注明： 转载自Cocos2Der-CSDN，谢谢！

原文地址: http://blog.csdn.net/cocos2der/article/details/46539433

Delegate作用我就不多说了，Unity中可以直接使用EventHandler实现事件委托，咱们直接事例吧。

一、场景物体移动结束后事件监听

假如PlayerControl，移动结束后触发MoveComplete事件。

using UnityEngine;
using System.Collections;
using System;

public class PlayerControl : MonoBehaviour {

public event EventHandler MoveComplete;

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
if (Input.GetMouseButtonUp(0)) {
// Test logic for PlayerMoveComplete
PlayerMoveComplete();
}
}

void PlayerMoveComplete()
{
if (MoveComplete != null) {
MoveComplete(this, EventArgs.Empty);
}
}
}

事件接收处理

using UnityEngine;
using System.Collections;
using System;

public class GameManager : MonoBehaviour {
public static GameManager Instance;
public PlayerControl playerControl;

void Awake ()
{
// check there isn't more than one instance of the GameManager in the scene
if(Instance != null){
Debug.LogError("More than one GameManager found in the scene");
return;
}
// set the global instance
Instance = this;
}

// Use this for initialization
void Start () {
playerControl.MoveComplete += HandleMoveComplete;
}

void HandleMoveComplete (object sender, EventArgs e)
{
Debug.Log("MoveComplete:");
}

// Update is called once per frame
void Update () {

}
}

这里由于使用的EventHandler实现，所以在事件中无法传递自定义参数。

二、自定义Event，事件中传递自定义参数

1、自定义EventArgs

using UnityEngine;
using System.Collections;
using System;

public class PlayerMoveEventArgs : EventArgs {

private string message;

public PlayerMoveEventArgs(string message)
{
this.message = message;
}

public string Message
{
get{return message;}
}

}

public delegate void MoveCompleteHandle(object sender, PlayerMoveEventArgs e);

那么我们修改下PlayerControl

using UnityEngine;
using System.Collections;
using System;

public class PlayerControl : MonoBehaviour {

public event EventHandler MoveComplete;

public event MoveCompleteHandle CustomMoveComplete;

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
if (Input.GetMouseButtonUp(0)) {
// Test logic for PlayerMoveComplete
PlayerMoveComplete();
}
}

void PlayerMoveComplete()
{
if (MoveComplete != null) {
MoveComplete(this, EventArgs.Empty);
}

if (CustomMoveComplete != null) {
CustomMoveComplete(this, new PlayerMoveEventArgs("Move:" + this.name));
}
}
}

处理事件的我们也修改下

using UnityEngine;
using System.Collections;
using System;

public class GameManager : MonoBehaviour {
public static GameManager Instance;
public PlayerControl playerControl;

void Awake ()
{
// check there isn't more than one instance of the GameManager in the scene
if(Instance != null){
Debug.LogError("More than one GameManager found in the scene");
return;
}
// set the global instance
Instance = this;
}

// Use this for initialization
void Start () {
playerControl.MoveComplete += HandleMoveComplete;

playerControl.CustomMoveComplete += HandleCustomMoveComplete;
}

void HandleCustomMoveComplete (object sender, PlayerMoveEventArgs e)
{
Debug.Log("HandleCustomMoveComplete:" + e.Message);
}

void HandleMoveComplete (object sender, EventArgs e)
{
Debug.Log("MoveComplete:");
}

// Update is called once per frame
void Update () {

}
}

ok，现在你可以自由的玩耍了。