I have been trying to understand Autolayout from quite a long time. I do have tried it using xib but there are somethings which cant be achieved using xib, and now I have found out a nice tutorial from the internet and now I am becoming expert with VFL. Please find the tutorial + the sample code in the below links. Happy Coding.

Visual Format Language

Sample Code

VFL

Another one nice Autolayout Visual Format language tutorial is here

Autolayout Progrmatically