Workaround to vanilla UICollectionView+UICollectionViewFlowLayout using non-integral origins, leading to blurry cells.

gistfile1.txt

@implementation BHSCollectionViewFlowLayout

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect {
    NSArray *allAttrs = [super layoutAttributesForElementsInRect:rect];
    for (UICollectionViewLayoutAttributes *attributes in allAttrs) {
        attributes.frame = CGRectIntegral(attributes.frame);
    }
    return allAttrs;
}

@end