HighGroundRoyaleNetcode/Assets/Scripts/Gameplay/AbilityUI.cs

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

namespace Unity.Multiplayer.Samples.BossRoom
{

    public class AbilityUI : MonoBehaviour
    {
        public string key;
        public Image CoolDownImg;
        public GameObject CoolDownImgParent;
        public IEnumerator StopWatchRoutine;
        public void StopWatchFiller(float coolDownTime)
        {
            if (StopWatchRoutine == null)
            {
                StopWatchRoutine = StopWatchFillerRoutine(coolDownTime);
                StartCoroutine(StopWatchRoutine);
            }
            else
            {
                StopCoroutine(StopWatchRoutine);
                StopWatchRoutine = StopWatchFillerRoutine(coolDownTime);
                StartCoroutine(StopWatchRoutine);
            }
        }
        public IEnumerator StopWatchFillerRoutine(float coolDownTime)
        {
            float factor = coolDownTime;
            CoolDownImgParent.SetActive(true);
            // CoolDownImg.gameObject.SetActive(true);
            CoolDownImg.fillAmount = 1;
            while (coolDownTime > 0)
            {
                coolDownTime -= Time.deltaTime;
                CoolDownImg.fillAmount = coolDownTime / factor;
                yield return new WaitForSeconds(Time.deltaTime);
            }
            CoolDownImgParent.SetActive(false);
            // CoolDownImg.gameObject.SetActive(false);
            StopWatchRoutine = null;
        }
    }
}