Auto Layout is easy and intuitive to use with Interface Builder, but in code it can be a significant amount of work and pretty verbose. To make this easier, Apple introduced the Visual Format Language to allow developers to add constraints in a succinct and readable manner. In this tutorial, we will look at how to use Visual Format Language in your code and how to understand its syntax.
Source files for the Tuts+ tutorial: Introduction to the Visual Format Language
Read this tutorial on Tuts+