ProjectZ/Assets/Scripts/Settings/MenuSettings.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using UnityEngine.Audio;
using TMPro;

public class MenuSettings : MonoBehaviour
{
    [SerializeField] private TMP_InputField mouseInput;
    [SerializeField] private Slider mouseSlider;

    [SerializeField] private TMP_Text volumeInput;
    [SerializeField] private Slider volumeSlider;

    public TMP_InputField inputR, inputG, inputB;
    public Image gunColorImage;
    private float _R, _G, _B;
    private Color _gunColor;

    void Start()
    {
        volumeSlider.value = PlayerPrefs.GetFloat("Volume");

        mouseInput.text = PlayerPrefs.GetFloat("Sensitivity").ToString("N2");
        mouseSlider.value = PlayerPrefs.GetFloat("Sensitivity");

        volumeInput.text = PlayerPrefs.GetFloat("Volume").ToString("N2");

        if (!PlayerPrefs.HasKey("GunColorR"))
        {
            PlayerPrefs.SetFloat("GunColorR", 6f / 255);
            PlayerPrefs.SetFloat("GunColorG", 14f / 255);
            PlayerPrefs.SetFloat("GunColorB", 243f / 255);
        }

        inputR.text = (PlayerPrefs.GetFloat("GunColorR") * 255).ToString();
        inputG.text = (PlayerPrefs.GetFloat("GunColorG") * 255).ToString();
        inputB.text = (PlayerPrefs.GetFloat("GunColorB") * 255).ToString();

        _R = PlayerPrefs.GetFloat("GunColorR");
        _G = PlayerPrefs.GetFloat("GunColorG");
        _B = PlayerPrefs.GetFloat("GunColorB");

        SetMenuGunColor();
    }

    public void SetSensitivity(string sensitivity)
    {
        SetSensitivity(float.Parse(sensitivity));
    }

    public void SetSensitivity(float sensitivity)
    {
        mouseSlider.value = sensitivity;
        mouseInput.text = sensitivity.ToString("N2");
        Settings.instance.SetSensitivity(sensitivity);
    }

    public void SetVolume(string volume)
    {
        SetVolume(float.Parse(volume));
    }

    public void SetVolume(float volume)
    {
        volumeSlider.value = volume;
        volumeInput.text = volume.ToString("N2");

        Settings.instance.SetVolume(volume);
    }

    public void SetColorR(string str)
    {
        float value = float.Parse(str) / 255;
        PlayerPrefs.SetFloat("GunColorR", value);
        _R = value;
        SetMenuGunColor();
    }

    public void SetColorG(string str)
    {
        float value = float.Parse(str) / 255;
        PlayerPrefs.SetFloat("GunColorG", value);
        _G = value;
        SetMenuGunColor();
    }

    public void SetColorB(string str)
    {
        float value = float.Parse(str) / 255;
        PlayerPrefs.SetFloat("GunColorB", value);
        _B = value;
        SetMenuGunColor();
    }

    private void SetMenuGunColor()
    {
        _gunColor = new Color(_R, _G, _B);
        gunColorImage.color = _gunColor;
    }

}