将子视图添加到自定义类的superview不起作用

I'm trying to learn how to make a custom class that can add subviews to it's superview and believe the code I have below should work, but it's not and I don't understand enough to figure out why. It builds successfully and runs through adding the subview but I never see it on my simulator. I was hoping someone could point me in the right direction.I'm trying to learn how to make a custom class