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The HUD

Part of the Game Architecture in Unity section of Coddy's Unity journey. Lesson 58 of 64.

Challenge

Medium

Build a HUD that only listens.

Hero gets public event Action<int, int> HealthChanged; raise it with (health, maxHealth) in Start and on every change.
WaveSpawner gets public event Action<int> WaveStarted, raised with Wave as each wave starts.
In HUD, subscribe in OnEnable, unsubscribe in OnDisable; fill healthBar, show HP 3/5 and Wave 2. No Update.

Press Play and fight: the HUD keeps up. Then Check.

Try it yourself

using UnityEngine;
using UnityEngine.UI;
using TMPro;

public class HUD : MonoBehaviour
{
    [SerializeField] private Hero hero;
    [SerializeField] private WaveSpawner spawner;
    [SerializeField] private Image healthBar;
    [SerializeField] private TMP_Text healthText;
    [SerializeField] private TMP_Text waveText;

    // A later lesson fills this in: health and wave on screen.
}

All lessons in Game Architecture in Unity

1Components, Not Hierarchies

Small Components A Base Enemy Script Abstract Components Components Working Together Recap: Modular Turret Recap: Twin Cannon

4Serialized Data

Serializable Classes Lists in the Inspector Enums in the Inspector Recap: Loot Table Recap: Roll the Loot

7State Machines

States as Classes The Alert State A State Machine Transitions Enemy Brains The Knight Attacks Recap: Door States

10Project: Arena Survivor

The Hero Enemy Types

Project lesson

Damage Everything

Project lesson

Enemies Strike Back

Project lesson

Waves of Enemies

Project lesson

Clear the Arena

Project lesson

Project lesson

Shields and Rewards

Project lesson

The HUD

Project lesson

Project lesson

Keep the Best Run

Project lesson

2Interfaces in Unity

IDamageable Interfaces and TryGetComponent GetComponents Recap: Interact Key Recap: Nearest in Reach

5ScriptableObjects

Data Assets Weapon Stats Shared Settings Save the Wind Waves as Data Recap: Item Database Recap: Buy from the Shop

8Reusable Code

Extension Methods A Generic Singleton Generic Helpers Recap: FindNearest

11Final Challenges

Tower Defense Lite Crafting Bench Crafting Recipes Boss Fight

3Events

C# Events in Unity Subscribe in OnEnable UnityEvent Fields Events Drive the UI Recap: Achievement Popup Recap: Popup Timer

6Saving with JSON

JsonUtility Save the Game Load and Defaults Recap: Save Slots Pick and Delete a Slot

9Object Pooling

Why Pool Objects A Pool with a Queue Unity's ObjectPool Recap: Bullet Pool

Practice on your own: Unity playground