Back button: Implement reactions on Scenes

Assets/Scripts/GameOver.cs

@@ -4,6 +4,7 @@ using System.Collections;
 using UnityEngine.SceneManagement;
 using Assets.Scripts;
 using Assets.Scripts.API;
+using Assets.Scripts.Utils;
 
 public class GameOver : MonoBehaviour
 {
@@ -28,6 +29,7 @@ public class GameOver : MonoBehaviour
 //            SceneManager.LoadScene("Menu");
 		score = PlayerPrefs.GetInt("lastscore");
 		Score.text = "You scored " + score;
+		BackButtonHelper.playOnBack();
 	}
 
 	public void OnButtonPlayClicked()

Assets/Scripts/HighScores.cs

 using Assets.Scripts.API;
+using Assets.Scripts.Utils;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 using UnityEngine.UI;
@@ -21,6 +22,7 @@ public class HighScores : MonoBehaviour {
 
 	// Update is called once per frame
 	void Update () {
+		BackButtonHelper.playOnBack();
 		if (!updatedScores) {
 			if (Server.Scores.status.Equals("ok")) {
 				Score[] highScores = Server.Scores.scores;

Assets/Scripts/Menu.cs

 using UnityEngine;
 using System.Collections;
 using UnityEngine.SceneManagement;
+using Assets.Scripts.Utils;
 
 public class Menu : MonoBehaviour {
 
@@ -11,7 +12,7 @@ public class Menu : MonoBehaviour {
 	
 	// Update is called once per frame
 	void Update () {
-	
+		BackButtonHelper.quitOnBack();	
 	}
 
 	public void OnButtonPlayClicked()

Assets/Scripts/UIController.cs

@@ -3,6 +3,7 @@ using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using Assets.Scripts;
+using Assets.Scripts.Utils;
 using UnityEngine.UI;
 
 public class UIController : MonoBehaviour
@@ -37,6 +38,7 @@ public class UIController : MonoBehaviour
 	    DisplayBattery();
 	    HandlePowerUps();
 	    HandleScore();
+		BackButtonHelper.menuOnBack();
 	}
 
     private void HandleScore()

Assets/Scripts/Utils/BackButtonHelper.cs

+using System;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+namespace Assets.Scripts.Utils
+{
+	public static class BackButtonHelper 
+	{
+		public static void quitOnBack() {
+			if (Input.GetKeyDown(KeyCode.Escape)) 
+				Application.Quit(); 
+		}
+
+		public static void menuOnBack() {
+			if (Input.GetKeyDown(KeyCode.Escape)) 
+				SceneManager.LoadScene("Menu");
+		}
+
+		public static void playOnBack() {
+			if (Input.GetKeyDown(KeyCode.Escape)) 
+				SceneManager.LoadScene("Main");
+		}
+	}
+}
+

Assets/Scripts/Utils/BackButtonHelper.cs.meta

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+timeCreated: 1477660884
+licenseType: Free
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