ichni_Official/Assets/Scripts/Settings/SettingsManager.cs

using Ichni.Menu;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.Serialization;

namespace Ichni
{
    public class SettingsManager : SerializedMonoBehaviour
    {
        public static SettingsManager instance;
        
        [FormerlySerializedAs("settingsPage")] 
        public SettingsUIPage settingsUIPage;
        public GameSettings gameSettings;

        private void Awake()
        {
            if (instance == null)
            {
                instance = this;
                DontDestroyOnLoad(gameObject);
            }
            else
            {
                Destroy(gameObject);
            }
        }

        private void Start()
        {
            LoadGameSettings();
        }
        
        [Button]
        public void SaveGameSettings()
        {
            string savePath = Application.persistentDataPath + "/GameData/GameSettings.json";
            ES3.Save("GameSettings", gameSettings, savePath);
        }
        
        [Button]
        public void LoadGameSettings()
        {
            string savePath = Application.persistentDataPath + "/GameData/GameSettings.json";
            if (ES3.FileExists(savePath))
            {
                gameSettings = ES3.Load<GameSettings>("GameSettings", savePath);
            }
            else
            {
                gameSettings = new GameSettings(
                    50, 50, 50, 50,
                    0, 60, 3, 0, false, false);
            }
            
            gameSettings.ApplyVolume();
            gameSettings.ApplyGraphic();
        }
    }
}