Periodically trigger an event

PeriodicTrigger.cs

using System;

public class PeriodicTrigger
{
    public event Action TriggerEvent;
    
    private float _period;
    private float _remaining;

    public PeriodicTrigger( float period )
    {
        Reset( period );
    }

    public float Period
    {
        get { return _period; }
    }

    public void Reset( float period )
    {
        _period = period;
        _remaining = _period;
    }

    public bool Update( float dt )
    {
        if ( _remaining <= 0 )
        {
            OnTriggerEvent();
            _remaining += _period;
            return true;
        }
        _remaining -= dt;
        return false;
    }

    private void OnTriggerEvent()
    {
        var handler = TriggerEvent;
        if ( handler != null ) handler();
    }
}