Unity Color Changer

ColorChanger.cs

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

[RequireComponent(typeof(Image))]
public class ColorChanger : MonoBehaviour
{
    private Image _img;
    private List<Color> _colors = Constants.Colors;
    private int _minIndex;
    private int _maxIndex;
    private int _currentIndex;
    private Color _currentColor;

    private void Start()
    {
        _img = GetComponent<Image>();
        FillIndexes();
        SetColor();
    }

    public void PreviousColor()
    {
        Debug.Log($"Current Index: {_currentIndex}");
        Debug.Log($"Min Index: {_minIndex}");
        if (_currentIndex == _minIndex)
        {
            _currentIndex = _maxIndex + 1;
        }

        _currentIndex--;
        SetColor();
    }

    public void NextColor()
    {
        if (_currentIndex == _maxIndex)
        {
            _currentIndex = _minIndex - 1;
        }

        _currentIndex++;
        SetColor();
    }

    private void FillIndexes()
    {
        _minIndex = 0;
        _maxIndex = _colors.Count - 1;
        _currentIndex = _minIndex;
        
        Debug.Log($"Max Index: {_maxIndex}");
    }

    private void SetColor()
    {
        _img.color = _colors[_currentIndex];
        _currentColor = _img.color;
    }
}