Use of Delegates and Events in unity, delegatesunity

Use of Delegates and Events in unity, delegatesunity

How to create and use delegate Delegates to provide complex and dynamic functions on your script.

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;    }}

How to create a dynamic "broadcast" system and use events.

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;    }}

You can view: Unity3D-Use of the Delegate-SignalSlot information slot and replace SendMessage.