2016-03-21

Added Changing Constraints chapter.

2015-12-10

Added advanced recipes to the cookbook. Incorporated other minor updates.

2015-09-16

Updated to include information about using Auto Layout with iOS size classes. Added many Auto Layout examples.

2013-09-18

Updated to describe Auto Layout in Xcode 5.

2012-09-19

Added to iOS Library. Added links to WWDC videos.

2012-02-16

Corrected minor code error.

2011-07-06

New document that describes the constraint-based system for laying out user interface elements.