- (UICollectionViewLayoutAttributes *)preferredLayoutAttributesFittingAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes {
[self setNeedsLayout];
[self layoutIfNeeded];
CGSize size = [self systemLayoutSizeFittingSize:layoutAttributes.frame.size];
CGRect frame = layoutAttributes.frame;
frame.size.width = size.width;
layoutAttributes.frame = frame;
return layoutAttributes;
}