Collision Handler - A Unity component to add callbacks to respond to collisions or triggers

CollisionHandler.cs

// Often I need to add multiple triggers to single object that do different things.
// This script lets you add a child containing a collider, and assign Events to
// happen when the collider is entered or triggered.
//
// Simply create a child object, add a collider and add this script. Set up events
// like you would for any other components. (like Button etc.)

using System;
using UnityEngine;
using UnityEngine.Events;

[Serializable]
public class CollisionEvent : UnityEvent<Collision2D> {}

[Serializable]
public class TriggerEvent : UnityEvent<Collider2D> {}

[RequireComponent(typeof(Collider2D))]
public class CollisionHandler : MonoBehaviour
{
	public TriggerEvent OnTriggerEnter;
	public CollisionEvent OnCollisionEnter;

	private void OnCollisionEnter2D(Collision2D other)
	{
		if (OnCollisionEnter != null)
		{
			OnCollisionEnter.Invoke(other);
		}
	}

	private void OnTriggerEnter2D(Collider2D other)
	{
		if (OnTriggerEnter != null)
		{
			OnTriggerEnter.Invoke(other);
		}
	}
	
}