This looks great, I'm definitely buying this book. Does anyone have a good book recommendation focused on advanced iOS user interface development?

I'm starting to do programmatic layouts in code for my side projects and I think there are huge advantages to building user interfaces in code, but everyone seems to just do storyboards. Instead of waiting for Apple to release nice abstractions like UIStackView, in code you can create your own layout abstractions the way you'd like. There seems to be close to no content based around this unfortunately.