EasyPeasy is an open source Swift library from Carlos Vidal providing a very concise, and readable syntax for working with auto layout.
EasyPeasy provides position and dimension attributes that you can apply to your views, attribute classes for all the NSLayoutConstraint attributes, priorities, conditions, and restraints so you can control how the attributes are applied.
A playground for testing out the syntax, and an extensive example project are included.
This image from the readme shows off the EasyPeasy syntax:

You can find EasyPeasy on Github here.
A Playground for trying out EasyPeasy can be found on Github here.
A nice simplified way to work with auto-layout in Swift.
Original article: EasyPeasy – Open Source iOS Swift Library That Simplifies Working With Auto-Layout
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