OptionsController,cs

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

public class OptionsController : MonoBehaviour {

    public Slider volumeSlider;
    public Slider difficultySlider;
    public Slider controlSlider;

    private float percentage;

    private int maxValue; //max types, if gamepad not detected max is 1 not 2

    public Text percentText;
    public Text difficultyLevel;
    public Text controlText;
    public Text ControlLeft;
    public Text ControlRight;

    private Color inactive = Color.gray;
    private Color active = Color.white;

    public LevelManager levelManager;
    private MusicPlayer musicManager;
    private GamePadManager gamePad;




    // Use this for initialization
    void Start()
    {
        levelManager = GameObject.FindObjectOfType<LevelManager>();
        musicManager = GameObject.FindObjectOfType<MusicPlayer>();
        gamePad = FindObjectOfType<GamePadManager>();

        volumeSlider.value = PlayerPrefsManager.GetMasterVolume();
        difficultySlider.value = PlayerPrefsManager.GetDifficulty();
        controlSlider.value = PlayerPrefsManager.GetControlType();


    }

    // Update is called once per frame
    void Update()
    {
        //if(gamePad.noGamepad)
        //{
        //    controlSlider.maxValue = 1;
        //}
        //else
        //{
        //    controlSlider.maxValue = 2;
        //}

        //Is a gamepad detected?
        if(gamePad.noGamepad)
        {
            maxValue = 1;
        }
        else { maxValue = 2; }

        // Activate or Inactivate Arrow
        if (gamePad.controlType == 0)
        {
            ControlLeft.color = inactive;
        }
        else if (gamePad.controlType > 0)
        {
            ControlLeft.color = active;
        }

        if (gamePad.controlType == maxValue)
        {
            ControlRight.color = inactive;
        }

        else if (gamePad.controlType < maxValue)
        {
            ControlRight.color = active;
        }



        percentage = Mathf.RoundToInt((volumeSlider.value / 1f) * 100);
        percentText.text = percentage + "%";

        CheckDifficulty();
        CheckControlType();


        //PlayerPrefsManager.SetMasterVolume (volumeSlider.value);

        musicManager.ChangeVolume(volumeSlider.value);
        if (musicManager == null)
        {
            return;
        }
    }
    void CheckDifficulty()
    {
        if (difficultySlider.value == 1)
        {
            difficultyLevel.color = Color.white;
            difficultyLevel.text = "Easy";
        }
        else if (difficultySlider.value == 2)
        {
            difficultyLevel.color = Color.white;
            difficultyLevel.text = "Normal";
        }
        else if (difficultySlider.value == 3)
        {
            difficultyLevel.color = Color.white;
            difficultyLevel.text = "Hard";
        }
        else if (difficultySlider.value == 4)
        {
            difficultyLevel.color = Color.red;
            difficultyLevel.text = "Masochist";
        }
    }
    void CheckControlType()
    {
        if (gamePad.controlType == 0)
        {
            controlText.text = "Mouse";
        }
        else if (gamePad.controlType == 1)
        {
            controlText.text = "keyboard";
        }
        else if (gamePad.controlType == 2)
        {
            controlText.text = "GamePad";
        }
    }
    public void ControlLeftArrow()
    {
        if (gamePad.controlType > 0)
        {
            gamePad.controlType--;
        }
    }
    public void ControlRightArrow()
    {
        if (!gamePad.noGamepad && gamePad.controlType < 2)
        {
            gamePad.controlType++;
        }
        else if (gamePad.noGamepad && gamePad.controlType < 1)
        {
            gamePad.controlType++;
        }
    }

    public void SaveAndExit()
    {
        PlayerPrefsManager.SetMasterVolume(volumeSlider.value);
        PlayerPrefsManager.SetDifficulty(difficultySlider.value);
        PlayerPrefsManager.SetControlType(gamePad.controlType);
        levelManager.Loadlevel("01a Start");
    }

    public void SetDefaults()
    {
        volumeSlider.value = 0.8f;
        difficultySlider.value = 2f;
    }
}