fgm24/Assets/Scripts/Misc/HealthBar.cs

using UnityEngine;
using UnityEngine.UI;

public class HealthBar : MonoBehaviour
{
    [SerializeField]
    private HealthComponent attachedHealth;

    [SerializeField]
    private Image healthBarImg;

    [SerializeField]
    private Color healthLeftColor, unusedHealth;

    private void OnEnable()
    {
        attachedHealth.OnHealthChange.AddListener(UpdateHealthBar);
    }

    private void OnDisable()
    {
        attachedHealth.OnHealthChange.RemoveListener(UpdateHealthBar);
    }

    private void UpdateHealthBar(float prevHealth, float newHealth)
    {
        float percent = newHealth / attachedHealth.getMaxHealth();
        healthBarImg.fillAmount = percent;
    }
}