let activityViewController = UIActivityViewController(activityItems: items, applicationActivities: []) activityViewController.popoverPresentationController?.barButtonItem = navigationController.topViewController?.navigationItem.rightBarButtonItem navigationController.present(activityViewController, animated: true, completion: nil) Crash logs ===================================================== *** Assertion failure in -[_UIActivityContentCollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:], UICollectionView.m:7588 *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Attempted to dequeue a cell for a different registration or reuse identifier than the existing cell when reconfiguring an item, which is not allowed. You must dequeue a cell using the same registration or reuse identifier that was used to dequeue the cell originally to obtain the existing cell. Dequeued reuse identifier: UIActivityContentActionCellIdentifier; Original reuse identifier: UIActivityActionGroupCell; Existing cell: <UIActivityActionGroupCell: 0x10f19f220; baseClass = _UICollectionViewListCell; frame = (16 354; 358 30); clipsToBounds = YES; layer = <CALayer: 0x600000781740>>'