Auto Layout is a powerful constraint-based layout engine that can drive complex and dynamic interfaces on both iOS and OS X. Learn about the new UIStackView, now your first stop for interfaces built with Auto Layout. See how to build self-sizing views using Auto Layout, and gain critical insights into the inner workings of Auto Layout.
AstroLayout: Building Adaptive UI with Auto Layout
WWDC 2015 > App Frameworks > Mysteries of Auto Layout, Part 1