Specifying one Dimension of Cells in UICollectionView using Auto Layout

Question

In iOS 8 the UICollectionViewFlowLayout supports automatically resizing cells based on their own content size. This resizes the cells in both width and height a

Answer 1

YES it can be done using auto layout programmatically and by setting constraints in storyboard or xib. You need to add constraint for width size to remain constant and set height greater than or equal to.
http://www.thinkandbuild.it/learn-to-love-auto-layout-programmatically/

http://www.cocoanetics.com/2013/08/variable-sized-items-in-uicollectionview/
Hope this will be helpful and solve your issue.