Swift - segue/popover to a class

I have followed this tutorial and created a class that creates CheckBoxes. This class is of type UIButton. I have my MainViewController class and when the user presses a button in MainViewController I want to show the checkboxes class as a view. What is the most appropriate way to do this? I can´t create a segue because the checkbox class is not of type UIViewController or am I wrong? Any ideas of how to do this? The nicest way would be to show a popover if possible.