PauseCanvas Template

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

/*
 http://stackoverflow.com/questions/36809687/ui-canvas-image-with-ui-buttons
 */

public class PauseCanvas : MonoBehaviour
{
    public Button resumeButton;
    public Button backToMainMenuButton;
    public Button settingsButton;
    public Button exitGameButton;

    public Canvas gameCanvas;
    public Canvas mainMenuCanvas;
    public Canvas settingsMenuCanvas;

    void OnEnable()
    {
        //Register Button Events
        resumeButton.onClick.AddListener(() => buttonCallBack(resumeButton));
        backToMainMenuButton.onClick.AddListener(() => buttonCallBack(backToMainMenuButton));
        settingsButton.onClick.AddListener(() => buttonCallBack(settingsButton));
        exitGameButton.onClick.AddListener(() => buttonCallBack(exitGameButton));
    }

    private void buttonCallBack(Button buttonPressed)
    {
        //Resume Button Pressed
        if (buttonPressed == resumeButton)
        {
            //Hide this Pause Canvas
            gameObject.SetActive(false);

            //Show Game Canvas
            gameCanvas.gameObject.SetActive(true);
        }

        //Back To Main Menu Button Pressed
        if (buttonPressed == backToMainMenuButton)
        {
            //Hide this Pause Canvas
            gameObject.SetActive(false);

            //Show Main Menu Canvas
            mainMenuCanvas.gameObject.SetActive(true);
        }

        //Settings Button Pressed
        if (buttonPressed == settingsButton)
        {
            //Hide this Pause Canvas
            gameObject.SetActive(false);

            //Show Settings Canvas
            settingsMenuCanvas.gameObject.SetActive(true);

            //Tell the settings Canvas that we are calling it from the Pause Menu so that the Stettings' back button will return here
            SettingsCanvas sV = settingsMenuCanvas.GetComponent<SettingsCanvas>();
            sV.setCalledFrom(SettingsCalledFrom.calledFromPauseMenu);
        }

        //Exit Game Button Pressed
        if (buttonPressed == exitGameButton)
        {
#if UNITY_EDITOR
            UnityEditor.EditorApplication.isPlaying = false;
#else

            Application.Quit();
#endif
        }

    }


    void OnDisable()
    {
        //Un-Register Button Events
        resumeButton.onClick.RemoveAllListeners();
        backToMainMenuButton.onClick.RemoveAllListeners();
        settingsButton.onClick.RemoveAllListeners();
        exitGameButton.onClick.RemoveAllListeners();
    }
}