Generic method to hook events to Unity 4.6+ UI EventTriggers

EventExtensions.cs

public static class EventExtensions
{	
	public static void AddEvent<TSource, TEvent>(this EventTrigger _trigger, EventTriggerType _eventType, TSource _source, Action<TSource, TEvent> _delegate)
		where TEvent : BaseEventData
	{
		EventTrigger.TriggerEvent triggerEvent = new EventTrigger.TriggerEvent();
		triggerEvent.AddListener(_data => _delegate(_source, _data as TEvent));
		_trigger.triggers.Add(new EventTrigger.Entry { eventID = _eventType, callback = triggerEvent });
	}
}

// sample usage :
// var eventTrigger = someImage.GetComponent<EventTrigger>();
// eventTrigger.AddEvent<Image, PointerEventData>(EventTriggerType.PointerEnter, someImage, OnImageEnter);
// ...
// void OnImageEnter(Image _source, PointerEventData _eventData) 
// {
// ...
// }