rabidus-test/Assets/Scripts/LeanTimer.cs

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

public class LeanTimer : MonoBehaviour
{
    [Header("Start values:")]
    public bool StartOnAwake = false;
    public float StartValue;
    public float EndValue;
    public float Time;
    

    public UnityEvent<float> OnUpdate = new UnityEvent<float>();

    private LTDescr LTDescr;

    private void Start()
    {
        if (StartOnAwake)
        {
            StartTimer(StartValue, EndValue, Time);
        }    
    }

    public void StartTimer(float startValue, float endValue, float time, System.Action OnComplete = null)
    {
        LTDescr = LeanTween.value(1, 0, time).setOnUpdate((float x) =>
        {
            OnUpdate?.Invoke(x);
        }).setOnComplete(OnComplete);
    }

    public void StopTimer(float value = 0)
    {
        if (LTDescr != null)
        {
            LeanTween.cancel(LTDescr.id);
            OnUpdate?.Invoke(value);
        }
    }
}