zombie_mp/Assets/Scripts/Helpers/EnumSelect.cs

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

public class EnumSelect : MonoBehaviour
{
    public EventTrigger prevBtn;
    public EventTrigger nextBtn;
    public Text label;
    public string[] choices;
    public int curIndex;
    public string value => choices[curIndex];

    public UnityEvent OnValueChanged;
    void Start()
    {
        update();

        EventTrigger.Entry entry = new EventTrigger.Entry();
        entry.eventID = EventTriggerType.PointerDown;
        entry.callback.AddListener(OnSelectNext);
        nextBtn.triggers.Add(entry);

        EventTrigger.Entry entry2 = new EventTrigger.Entry();
        entry2.eventID = EventTriggerType.PointerDown;
        entry2.callback.AddListener(OnSelectPrev);
        prevBtn.triggers.Add(entry2);
    }

    void OnSelectNext(BaseEventData e){
        curIndex = (curIndex < choices.Length-1) ? curIndex+1 : 0;
        update();
    }

    void OnSelectPrev(BaseEventData e){
        curIndex = (curIndex > 0) ? curIndex-1 : choices.Length;
        update();
    }

    void update(){
        label.text = choices[curIndex];
    }
}