MenuSystem.cs

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

public class MenuSystem : MonoBehaviour {
	public GameObject fadeInFadeOut;
	public GameObject menuCanvas;
	private Animator anim;
	private Transform SubtitleTrue;
	private Transform SubtitleFalse;
	
	// Use this for initialization
	void Start () {
		Button startBtn = menuCanvas.transform.Find ("Main Menu").Find ("Start Game").GetComponent<Button> ();
		Button optionBtn = menuCanvas.transform.Find ("Main Menu").Find ("Options").GetComponent<Button> ();
		Button startOptionBtn = menuCanvas.transform.Find ("Options Menu").Find ("Start Game").GetComponent<Button> ();
		GameObject MainMenu = GameObject.Find("Main Menu");
		GameObject OptionsMenu = GameObject.Find("Options Menu");

		OptionsMenu.SetActive (false);
		
		anim = GetComponent<Animator> ();
		
		/* START BUTTON */
		startBtn.onClick.AddListener (() => {
			
			Debug.Log ("Start Game");
			
			// Remove the start button
			MainMenu.SetActive(false);
			
			// Start the game
			anim.SetTrigger("StartGame");
		});// start button
		
		optionBtn.onClick.AddListener(() => {
			
			Debug.Log ("Go to Options");
			
			// Remove the start button
			MainMenu.SetActive(false);

			//Trigger Options Animation
			anim.SetTrigger("GoToOptions");

			menuCanvas.SetActive(false);

			// Delay Options Menu For 3 Seconds
			StartCoroutine(FadeInOptionsMenu());

			// Options Fades In
			OptionsMenu.SetActive (true);
			
			
		});// options start 


		startOptionBtn.onClick.AddListener(() => {
			
			Debug.Log ("Start Game");
			
			// Remove the start button
			MainMenu.SetActive(false);
			
			//Trigger Options Animation
			anim.Play("OptionsToStartGame",-1,0);
			
			menuCanvas.SetActive(false);
			
		});// start from options 

		
		/* OPTIONS MENU */
		SubtitleTrue = OptionsMenu.transform.Find ("SubtitleTrue");
		SubtitleFalse = OptionsMenu.transform.Find ("SubtitleFalse");
		SubtitleFalse.GetComponent<Image>().enabled = false;
		
		SubtitleTrue.GetComponent<Button> ().onClick.AddListener (() => {
			
			// Start fading towards black.
			Debug.Log ("Subtitles On");
			SubtitleTrue.GetComponent<Image>().enabled = true;
			SubtitleFalse.GetComponent<Image>().enabled = false;
			
		});
		
		SubtitleFalse.GetComponent<Button> ().onClick.AddListener (() => {
			
			Debug.Log ("Subtitles Off");
			SubtitleFalse.GetComponent<Image>().enabled = true;
			SubtitleTrue.GetComponent<Image>().enabled = false;
			 
		});
	}

	IEnumerator FadeInOptionsMenu()
	{
		yield return new WaitForSeconds (3);
		menuCanvas.SetActive (true);
		menuCanvas.GetComponent<Animator>().Play ("FadeInMenu",-1,0);
	}

	public void FadeOut()
	{
		fadeInFadeOut.GetComponent<Animation>().Play ("FadeBlack");
	}

}