Poster/Listener

using UnityEngine;

using System.Collections;

public class Poster : MonoBehaviour {

    //C# accessors for private variable

    public int Health

    {

        get { return _health; }

        set

        {

            //Clamp health between 0-100

            _health = Mathf.Clamp(value, 0, 100);

            //Post notification - health has been changed

            EventManager.Instance.PostNotification(EVENT_TYPE.HEALTH_CHANGE, this, _health);

        }

    }

    //Internal variables for health

    private int _health = 100;

    void Start()

    {

        StartCoroutine("DamageHealth");

    }

    IEnumerator DamageHealth()

    {

        while (Health > 0)

        {

            yield return new WaitForSeconds(1f);

            Health -= 5;

        }

    }

}

using UnityEngine;

using System.Collections;

public class Listener : MonoBehaviour {

    // Use this for initialization

    void Start()

    {

        //Add myself as listener for health changes event

        EventManager.Instance.AddListener(EVENT_TYPE.HEALTH_CHANGE, OnEvent);

    }

    //Called when events happen

    public void OnEvent(EVENT_TYPE Event_Type, Component Sender, object Param = null)

    {

        //Detect event type

        switch (Event_Type)

        {

            case EVENT_TYPE.HEALTH_CHANGE:

                OnHealthChange((int)Param);

                break;

        }

    }

    //Function called when health changes

    void OnHealthChange(int NewHealth)

    {

        Debug.Log("Health: " + NewHealth.ToString());

    }

}