Unity Code for enable next one of child of the game object

NextBackList.cs

// Author: github.com/farukcan
// Depends to Child Selector : https://gist.github.com/farukcan/cb7865963f59d4e3e6451a11dfcc0f3a
// Usage :
// list.Next() 
// list.Back();

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

public class NextBackList : ChildSelector {

    public void Next() {
        bool next = false;
        Transform first = null;

        foreach (Transform child in transform)
        {
            if (first == null)
                first = child;
            if (next) {
                Select(child.gameObject.name);
                return;
            }
            if (child.gameObject.activeSelf)
            {
                next = true;
            }
        }

        Select(first.gameObject.name);

    }

    public void Back()
    {
        Transform pre = null;
        foreach (Transform child in transform)
        {

            if (child.gameObject.activeSelf)
            {
                if (pre != null) {
                    Select(pre.gameObject.name);
                    return;
                }
            }
            pre = child;
        }

        Select(pre.gameObject.name);
    }
}