oz_poc/unity_project/Assets/BeatEmUp_GameTemplate3D/Scripts/UI/ButtonFlicker.cs

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class ButtonFlicker : MonoBehaviour {

	public Text buttonText;
	public float flickerSpeed = 40f;
	public float flickerDuration = 1f;

	void OnDisable(){
		buttonText.enabled = true;
	}

	public void StartButtonFlicker () {
		StartCoroutine(ButtonFlickerCoroutine());
	}
	
	IEnumerator ButtonFlickerCoroutine(){
		float t =0;
		while(t < flickerDuration){
			float i = Mathf.Sin(Time.time * flickerSpeed);
			buttonText.enabled = (i>0);
			t += Time.deltaTime;
			yield return null;
		}
		buttonText.enabled = true;
	}
}