And cartography, which is my preference: https://github.com/robb/Cartography https://github.com/robb/Cartography constrain(button1, button2) { button1, bu

And cartography, which is my preference: https://github.com/robb/Cartography https://github.com/robb/Cartography constrain(button1, button2) { button1, button2 in button1.right == button2.left - 12 }