Mixing self sizing cells with calculated sizes

Question

My initial task is to have equal widths of cells and make them fill the entire row of the collection view with UICollectionViewFlowLayout.

Is there a way to calculate height of cells using autolayout, but provide width from sizeForItemAtIndexPath?

Answer 1

In sizeForItemAtIndexPath, calculate the height using systemLayoutSizeFittingSize: with a CGSize of your desired width, and a height large enough to fit your largest content.

e.g. for cell width of 100 (large maximum height of 999):

[collectionViewCell.contentView systemLayoutSizeFittingSize:CGSizeMake(100, 999)];

Beware though, if you have multiline UILabel's, as you will need to fiddle with preferredMaxLayoutWidth. More details, albeit for a table view, here.