在Swift随机产生的每一秒都会产生UIView

I am trying to "spawn" a UIView with a random UIColor as its background at a random CGPoint. I am using the code below which compiles fine with no bugs or anything but when it runs in the simulator I click start(the button on the first ViewController) but then go to ViewTwo but nothing happens(no "enemies" are spawned). Thank you for any help.I am trying to "spawn" a UIView with a random U