Part of these game systems:
beginner Health & Combat

Health System

Reusable health component with damage, healing, invincibility frames, and events.

Unity 2022.3+ · 2.4 KB · HealthSystem.cs

How to Use

1

Attach to any GameObject that needs health (player, enemies, destructibles)

2

Configure max health and invincibility duration

3

Hook up events in the inspector or via code

4

Call TakeDamage() and Heal() from other scripts

Source Code

HealthSystem.cs
C# 
using UnityEngine;
using UnityEngine.Events;

public class HealthSystem : MonoBehaviour
{
    [Header("Health")]
    [SerializeField] private float maxHealth = 100f;
    [SerializeField] private float currentHealth;

    [Header("Invincibility")]
    [SerializeField] private float invincibilityDuration = 0.5f;
    private float invincibilityTimer;

    [Header("Events")]
    public UnityEvent<float, float> OnHealthChanged; // current, max
    public UnityEvent OnDeath;
    public UnityEvent OnDamaged;
    public UnityEvent OnHealed;

    public float CurrentHealth => currentHealth;
    public float MaxHealth => maxHealth;
    public float HealthPercent => currentHealth / maxHealth;
    public bool IsAlive => currentHealth > 0f;
    public bool IsInvincible => invincibilityTimer > 0f;

    private void Awake()
    {
        currentHealth = maxHealth;
    }

    private void Update()
    {
        if (invincibilityTimer > 0f)
            invincibilityTimer -= Time.deltaTime;
    }

    public void TakeDamage(float damage)
    {
        if (!IsAlive || IsInvincible || damage <= 0f) return;

        currentHealth = Mathf.Max(0f, currentHealth - damage);
        invincibilityTimer = invincibilityDuration;

        OnHealthChanged?.Invoke(currentHealth, maxHealth);
        OnDamaged?.Invoke();

        if (!IsAlive)
            OnDeath?.Invoke();
    }

    public void Heal(float amount)
    {
        if (!IsAlive || amount <= 0f) return;

        currentHealth = Mathf.Min(maxHealth, currentHealth + amount);

        OnHealthChanged?.Invoke(currentHealth, maxHealth);
        OnHealed?.Invoke();
    }

    public void SetMaxHealth(float newMax, bool healToFull = false)
    {
        maxHealth = newMax;
        if (healToFull)
            currentHealth = maxHealth;
        else
            currentHealth = Mathf.Min(currentHealth, maxHealth);

        OnHealthChanged?.Invoke(currentHealth, maxHealth);
    }

    public void ResetHealth()
    {
        currentHealth = maxHealth;
        invincibilityTimer = 0f;
        OnHealthChanged?.Invoke(currentHealth, maxHealth);
    }
}
78 lines

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