promotion-teacup.rb

Teacup::Stylesheet.new :main do
  style :my_style,
    constraints: [
      constrain_left(0),
      constrain_width(100),
      constrain_top(0),
      constrain(:bottom).equals(:superview, :bottom),
    ]
end

class HomeScreen < PM::Screen
  stylesheet :main

  def will_appear
    add UIView, :my_style
  end
end

is PM::Screen a subclass of UIViewController?

Yes, sure is.

That doesn't work here, any ideas?

I get:

2013-10-08 17:07:41.156 LumieVideo[41938:a0b] +[UIView superview]: unrecognized selector sent to class 0x17207e0
(main)> 2013-10-08 17:07:42.872 LumieVideo[41938:a0b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[UIView superview]: unrecognized selector sent to class 0x17207e0'
*** First throw call stack:

Nevermind, I just had to call this way:
add UIView, { stylename: :background }