[Unity] Change resolution in game

// This script change resolution in game.
// Create a list to reject the same resolutions which "Screen.resolutions" gets.
// Do not use PlayerPrefs on void OnEnable or Start because when we link other monitor it is possible we get different
// resolutions and this may appear unwanted problems.

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

public class ChangeResolutionInGame : MonoBehaviour {

    [SerializeField] Button buttonBack;
    [SerializeField] Button buttonApplyResolution;
    [SerializeField] Text textResolution;

    List<Resolution> differentResolutionList;
    Resolution[] resolutions;
    int counterCurrentResolution = -1;

    void OnEnable() // or void Start()
    {
        differentResolutionList = new List<Resolution>();
        resolutions = Screen.resolutions;

        bool different=true;
        for (int i = 0; i < resolutions.Length; i++)
        {
            for (int j = 0; j < differentResolutionList.Count; j++)
            {
                if (resolutions[i].width == differentResolutionList[j].width && resolutions[i].height ==        differentResolutionList[j].height)
                {
                    different = false;
                    break;
                }
                else
                {
                    different = true;
                }
            }
            if (different)
            {
                differentResolutionList.Add(resolutions[i]);
                different = false;
            }
        }
        resolutions = differentResolutionList.ToArray();
        buttonApplyResolution.GetComponent<Button>().enabled = false;
        for (int i = 0; i < resolutions.Length; i++)
        {
            if (resolutions[i].width == Screen.currentResolution.width && resolutions[i].height == Screen.currentResolution.height)
            {
                Debug.Log(Screen.currentResolution.width);
                Debug.Log(Screen.currentResolution.height);
                counterCurrentResolution = i;
            }
            Debug.Log(resolutions[i].width + "x" + resolutions[i].height);
        }

        if (counterCurrentResolution == -1)
        {
            Screen.SetResolution(resolutions[0].width, resolutions[0].height, true);
            counterCurrentResolution = 0;
        }
        textResolution.text = Screen.currentResolution.width + " x " + Screen.currentResolution.height;
    }

    [ContextMenu("ChangeResolution()")]
    void ChangeResolution()
    {
        Screen.SetResolution(resolutions[1].width, resolutions[1].height, true);
    }

    public void ChangeResolutionPlus()
    {
        if (counterCurrentResolution < resolutions.Length-1)
        {
            counterCurrentResolution++;
            textResolution.text = resolutions[counterCurrentResolution].width + "x" + resolutions[counterCurrentResolution].height;
            buttonApplyResolution.enabled = true;
        }
    }

    public void ChangeResolutionMinus()
    {
        if (counterCurrentResolution > 0)
        {
            counterCurrentResolution--;
            textResolution.text = resolutions[counterCurrentResolution].width + "x" + resolutions[counterCurrentResolution].height;
            buttonApplyResolution.enabled = true;
        }
    }

    public void SetResolution()
    {
        PlayerPrefs.SetInt("Resolution", counterCurrentResolution);
        Debug.Log("Set Resolution to " + resolutions[counterCurrentResolution].width + " x " + resolutions[counterCurrentResolution].height);
        Screen.SetResolution(resolutions[counterCurrentResolution].width, resolutions[counterCurrentResolution].height, true);
    }

    void WriteThisFunctionInOtherScriptAndPutItOnStartScene()
    {
        List<Resolution> _differentResolutionList;
        Resolution[] _resolutions;
        _resolutions = Screen.resolutions;
        _differentResolutionList = new List<Resolution>();
        resolutions = Screen.resolutions;
        bool different=true;
        for (int i = 0; i < _resolutions.Length; i++)
        {
            for (int j = 0; j < _differentResolutionList.Count; j++)
            {
                if (_resolutions[i].width == _differentResolutionList[j].width && _resolutions[i].height == _differentResolutionList[j].height)
                {
                    different = false;
                    break;
                }
                else
                {
                    different = true;
                }
            }
            if (different)
            {
                _differentResolutionList.Add(_resolutions[i]);
                different = false;
            }
        }
        _resolutions = _differentResolutionList.ToArray();

        if (PlayerPrefs.HasKey("Resolution"))
        {
            int currentResolution = PlayerPrefs.GetInt("Resolution");
            Debug.Log("Current resolution: " + _resolutions[currentResolution].width + " x " + _resolutions[currentResolution].height);
            Screen.SetResolution(_resolutions[currentResolution].width, _resolutions[currentResolution].height, true);
        }
        else
        {
            Screen.SetResolution(_resolutions[_resolutions.Length - 1].width, _resolutions[_resolutions.Length - 1].height, true);
            Debug.Log("Current resolution: " + _resolutions[_resolutions.Length - 1].width + " x " + _resolutions[_resolutions.Length - 1].height);
        }
    }

}