CoroutineSample.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CoroutineSample : MonoBehaviour {

	IEnumerator coroutine;

	void Awake()
	{
		coroutine = Sample ();
	}

	void OnEnable()
	{
		StartCoroutine (coroutine);
	}

	void OnDisable()
	{
		StopCoroutine (coroutine);
	}

	IEnumerator Sample()
	{
		int count = 0;
		while (true) {
			count++;
			Debug.Log (count);
			yield return new WaitForSeconds (0.3f);
		}
	}
}