targetContentOffset(forProposedContentOffset:) in my CustomFlowLayout not called

I am writing a custom UICollectionViewFlowLayout which overrides targetContentOffset(forProposedContentOffset:) in order to provide right contentOffset when user pinch to zoom since I get this problem (wrong contentOffset)

Dynamically setting layout on UICollectionView causes inexplicable contentOffset change

class TimelineCollectionViewFlowLayout: UICollectionViewFlowLayout { // MARK: - Init override init() { super.init() self.minimumLineSpacing = 0 } required init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder) } override func prepare() { if let collectionView = self.collectionView { collectionView.isPagingEnabled = false self.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) self.scrollDirection = .horizontal } } override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint) -> CGPoint { print("hello") return proposedContentOffset } } 

But unfortunately targetContentOffset is not called, do you have an idea why?

Thanks!

Thierry