This is a quick sample of using storyboards with parent-child viewcontrollers - this particular sample is geared more towards a 'wizard' window, where I opted to have the navigation buttons be within the child views instead of the parent. This structure is essentially used for the 'first-run experience' in my own app, Thimble.
The child viewcontrollers are lazy-loaded and is based on [Mike Woelmer's iOS tutorial] (https://spin.atomicobject.com/2015/09/02/switch-container-views/)