public static void AddItemCollectedInvoker(ItemController itemCollectedInvoker)
{
// add the new invoker to the list of invokers
itemCollectedInvokers.Add(itemCollectedInvoker);
// ensure that all existing listeners are added to this new invoker
foreach (UnityAction <string> listener in itemCollectedListeners)
{
itemCollectedInvoker.AddItemCollectedListener(listener);
}
}
