iOS 8.4 doesn't update constraints on uicollectionviewcell

Question

I'm making a very simple collection view . I want an image in each cell that make half width of the cell. I modify the frame of the cell with

(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

I have only 4 constraints on my image (I made them on the storyboard):

• Leading space to cell leading = 0
• Top space to cell top = 0
• Bottom space to cell bottom = 0
• Right space to cell center X = 0

The things is it looks fine on the storyboard, but don't work in real. Here an image :

What I'm doing wrong ?

Thank you

Answer 1

尝试在UIImageView上设置“缩放为填充模式”