HealthBar

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

[RequireComponent(typeof(Slider))]
public class HealthBar : MonoBehaviour
{
    [SerializeField] private Hero _player;
    [SerializeField] private float _maxDelta;

    private Slider _slider;

    private void OnEnable()
    {
        _player.HealthChanged += StartChangeValue;
        _slider = GetComponent<Slider>();
        _slider.maxValue = _player.MaxHealth;
        _slider.value = _player.Health;
    }

    private void OnDisable()
    {
        _player.HealthChanged -= StartChangeValue;
    }

    public void StartChangeValue()
    {
        StartCoroutine(ChangeValue());
    }

    private IEnumerator ChangeValue()
    {
        while (_slider.value != _player.Health)
        {
            _slider.value = Mathf.MoveTowards(_slider.value, _player.Health,_maxDelta);
            yield return null;
        }
    }
}