Unity Trigger Action - used to wire up actions to trigger events

TriggerAction.cs

// Script by Edward Rowe (@edwardlrowe)
using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif

[RequireComponent (typeof(Collider2D))]
public class TriggerAction : MonoBehaviour
{
	[Tooltip ("Tag strings of valid objects to activate Trigger.")]
	public string[] FilterTags;
	[Tooltip ("Disable the collider and Trigger when Touched.")]
	public bool DisableOnTouch;

	public UnityEngine.Events.UnityEvent
		TouchEvent;
	
	Collider2D myCollider {
		get {
			if (_myCollider == null) {
				_myCollider = GetComponent<Collider2D> ();
			}
			return _myCollider;
		}
	}

	Collider2D _myCollider;
	
	void OnTriggerEnter2D (Collider2D other)
	{
		if (ShouldColliderFireAction (other)) {
			FireTouchEvent ();
		}
	}

	bool ShouldColliderFireAction (Collider2D activator)
	{
		if (FilterTags == null || FilterTags.Length == 0) {
			return true;
		}

		// Search for matching tags
		for (int i = 0; i < FilterTags.Length; i++) {
			if (activator.CompareTag (FilterTags[i])) {
				return true;
			}
		}

		// Matched no tags
		return false;
	}

	void FireTouchEvent ()
	{
		TouchEvent.Invoke ();
		
		if (DisableOnTouch) {
			myCollider.enabled = false;
			enabled = false;
		}
	}
}

#if UNITY_EDITOR
[CustomEditor (typeof (TriggerAction)), CanEditMultipleObjects]
public class TriggerActionInspector : UnityEditor.Editor
{
	public override void OnInspectorGUI ()
	{
		DrawDefaultInspector ();

		var triggerAction = target as TriggerAction;
		Collider2D collider = triggerAction.GetComponent<Collider2D> ();

		if (collider == null) {
			EditorGUILayout.HelpBox ("Missing Collider2D on TriggerAction", MessageType.Error);
		} else {
			if (!collider.isTrigger) {
				EditorGUILayout.HelpBox ("Trigger Events will not be called unless collider is a Trigger", MessageType.Warning);
			}
		}
	}
}
#endif