Danro/Assets/Scripts/Settings/UI/SettingDropdownResolutionBinder.cs

using System.Collections.Generic;
using RR.Common.Settings;
using TMPro;
using UnityEngine;

namespace RR.Common.UI
{
    public class SettingDropdownResolutionBinder : MonoBehaviour
    {
        [SerializeField] private string key;
        [SerializeField] private TMP_Dropdown dropdown;
        [SerializeField] private TMP_Text label;

        private SettingEntry def;

        private void Start()
        {
            def = SettingsManager.Instance.Define(key);
            if (def == null)
            {
                gameObject.SetActive(false);
                return;
            }

            if (label) label.text = def.displayName;

            var rs = Screen.resolutions;
            var options = new List<string>();

            for (int i = 0; i < rs.Length; i++)
                options.Add($"{rs[i].width} x {rs[i].height}");

            dropdown.ClearOptions();
            dropdown.AddOptions(options);

            int current = SettingsManager.Instance.Get(key).i;
            current = Mathf.Clamp(current, 0, dropdown.options.Count - 1);
            dropdown.SetValueWithoutNotify(current);

            dropdown.onValueChanged.AddListener(idx =>
                SettingsManager.Instance.Set(key, SettingValue.Int(idx))
            );
        }
    }
}