UIToggleGroup.cs

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using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;

namespace HKI.Core.UI
{
    public class UIToggleGroup : MonoBehaviour
    {
        // Class
        [System.Serializable]
        public class OnChangeEvent : UnityEvent<int> { }

        // Public variables
        [SerializeField] int StartId = 0;
        [SerializeField] Button[] Buttons = null;
        [SerializeField] GameObject[] ActiveIconGOs = null;

        [SerializeField] OnChangeEvent OnChange = new OnChangeEvent();

        // Private variables
        GameObject[] ButtonGOs = null;

        // Awake function
        void Awake()
        {
            ButtonGOs = new GameObject[Buttons.Length];

            for (int i = 0; i < Buttons.Length; i++)
            {
                int index = i;
                Buttons[i].onClick.RemoveAllListeners();
                Buttons[i].onClick.AddListener(() => { OnValueChange(index); });
                ButtonGOs[i] = Buttons[i].gameObject;
                ButtonGOs[i].SetActive(i != StartId);
                ActiveIconGOs[i].SetActive(i == StartId);
            }

        }

        // Interface function
        public void SetTo(int index)
        {
            for (int i = 0; i < ButtonGOs.Length; i++)
            {
                ButtonGOs[i].SetActive(i != index);
                ActiveIconGOs[i].SetActive(i == index);
            }
        }

        // Helper function
        void OnValueChange(int id)
        {
            for(int i = 0; i < ButtonGOs.Length; i++)
            {
                ButtonGOs[i].SetActive(i != id);
                ActiveIconGOs[i].SetActive(i == id);
            }

            OnChange.Invoke(id);
        }
    }
}