Delegates 和 Events 在unity中的使用



如何创建和使用委托Delegates 以提供复杂和动态功能在您的脚本上。

DelegateScript .cs

using UnityEngine;
using System.Collections;


public class DelegateScript : MonoBehaviour 
{   
    delegate void MyDelegate(int num);
    MyDelegate myDelegate;
    

    void Start () 
    {
        myDelegate = PrintNum;
        myDelegate(50);
        
        myDelegate = DoubleNum;
        myDelegate(50);
    }
    
    void PrintNum(int num)
    {
        print ("Print Num: " + num);
    }
    
    void DoubleNum(int num)
    {
        print ("Double Num: " + num * 2);
    }
}

MulticastScript.cs

using UnityEngine;
using System.Collections;

public class MulticastScript : MonoBehaviour 
{
    delegate void MultiDelegate();
    MultiDelegate myMultiDelegate;
    

    void Start () 
    {
        myMultiDelegate += PowerUp;
        myMultiDelegate += TurnRed;
        
        if(myMultiDelegate != null)
        {
            myMultiDelegate();
        }
    }
    
    void PowerUp()
    {
        print ("Orb is powering up!");
    }
    
    void TurnRed()
    {
        renderer.material.color = Color.red;
    }
}

如何创建一个动态的"broadcast广播"系统，使用事件。

EventManager.cs

using UnityEngine;
using System.Collections;

public class EventManager : MonoBehaviour 
{
    public delegate void ClickAction();
    public static event ClickAction OnClicked;

    
    void OnGUI()
    {
        if(GUI.Button(new Rect(Screen.width / 2 - 50, 5, 100, 30), "Click"))
        {
            if(OnClicked != null)
                OnClicked();
        }
    }
}

TeleportScript.cs

using UnityEngine;
using System.Collections;

public class TeleportScript : MonoBehaviour 
{
    void OnEnable()
    {
        EventManager.OnClicked += Teleport;
    }
    
    
    void OnDisable()
    {
        EventManager.OnClicked -= Teleport;
    }
    
    
    void Teleport()
    {
        Vector3 pos = transform.position;
        pos.y = Random.Range(1.0f, 3.0f);
        transform.position = pos;
    }
}

TurnColorScript.cs

using UnityEngine;
using System.Collections;

public class TurnColorScript : MonoBehaviour 
{
    void OnEnable()
    {
        EventManager.OnClicked += TurnColor;
    }
    
    
    void OnDisable()
    {
        EventManager.OnClicked -= TurnColor;
    }
    
    
    void TurnColor()
    {
        Color col = new Color(Random.value, Random.value, Random.value);
        renderer.material.color = col;
    }
}

可以查看：Unity3D - 关于Delegate - SignalSlot信息槽的使用和SendMessage取替