InputManager.cs

public void OnEndDrag(PointerEventData eventData)
{
    if (draggingStarted && direction != Direction.None)
    {
      //A swipe is detected
      if (onSwipeDetected != null)
          onSwipeDetected.Invoke(direction);
    }

    //reset the variables
    startPos = Vector2.zero;
    endPos = Vector2.zero;
    draggingStarted = false;
}