GTEasyLayout is a framework written in Swift which aims to minimise the effort of setting up constraints programmatically when implementing UI in iOS apps.
Introduction to SnapKit: Make Auto Layout Easy for iOS App Development
Create Auto Layout constraints programmatically and above all easily using SnapKit; A great tool for working fast with constraints in Swift.
Working with Auto Layout Visual Format Language and Programmatically Creating Constraints
This tutorial will show to you how to create Autolayout constraints using the Auto Layout Visual Format Language and programmatically by calling the proper iOS SDK APIs. Go through it and master constraints.