Awesome
FGFluidConstraints
With this category you can easily add constraints of an array of views that will have equal heights and space between them.
<img src="https://cloud.githubusercontent.com/assets/3661349/13295107/08f697dc-db06-11e5-9687-537c62640ecd.png" width="345" height="614"/> <img src="https://cloud.githubusercontent.com/assets/3661349/13295108/08f7206c-db06-11e5-80b7-8de8a4053a89.png" width="614" height="345"/>