Wave Counter

Lesson 24 of 25 in Coddy's Unity Game: Tower Defense course.

The HUD shows the wave number. The spawner knows it, and the GameManager shows it, so the spawner raises a C# event, WaveStarted, with the wave and the number of waves. Unlike the enemies' static events, it belongs to the one spawner, and the GameManager subscribes through its spawner field:

void OnEnable()
{
    spawner.WaveStarted += ShowWave;
}

An Action<int, int> passes two ints, so ShowWave takes two: void ShowWave(int wave, int total).

Challenge

Medium

Show which wave is on.

In WaveSpawner, add public event Action<int, int> WaveStarted; (using System;) and raise it with i + 1 and waves.Count as a wave starts.
In GameManager, add serialized spawner (WaveSpawner) and waveText (TMP_Text). Subscribe in OnEnable, unsubscribe in OnDisable, and show Wave 1/8.

Press Play: Wave 1/8 shows at the top right as the first wave starts. Then Check.

Try it yourself

using UnityEngine;
using TMPro;

public class GameManager : MonoBehaviour
{
    [SerializeField] private int startMoney = 150;
    [SerializeField] private int startLives = 20;
    [SerializeField] private TMP_Text moneyText;
    [SerializeField] private TMP_Text livesText;

    private int money;
    private int lives;

    void OnEnable()
    {
        Enemy.ReachedBase += OnReachedBase;
        Enemy.Killed += OnKilled;
    }

    void OnDisable()
    {
        Enemy.ReachedBase -= OnReachedBase;
        Enemy.Killed -= OnKilled;
    }

    void Start()
    {
        money = startMoney;
        lives = startLives;
        ShowMoney();
        ShowLives();
    }

    public bool TrySpend(int amount)
    {
        if (amount > money)
        {
            return false;
        }

        money -= amount;
        ShowMoney();
        return true;
    }

    public void Earn(int amount)
    {
        money += amount;
        ShowMoney();
    }

    void OnKilled(Enemy enemy)
    {
        Earn(enemy.data.reward);
    }

    void OnReachedBase(Enemy enemy)
    {
        lives -= enemy.data.damage;
        ShowLives();
    }

    void ShowMoney()
    {
        moneyText.text = "Money: " + money;
    }

    void ShowLives()
    {
        livesText.text = "Lives: " + lives;
    }
}