Method scrollToItemAtIndexPath is not working on iOS 14

Question

I am having an issue with scrollToItemAtIndexPath from iOS 14. In the previous iOS versions when the user stopped dragging, the next cell was centered horizontally, now the method scrollToItemAtIndexPath is ignored, and it remains stuck in the first cell.

    - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
    if( scrollView.tag == 1 ) {
        if (UI_USER_INTERFACE_IDIOM() != UIUserInterfaceIdiomPad){
            *targetContentOffset = scrollView.contentOffset; // set acceleration to 0.0
            float pageWidth = (float) (self.view.frame.size.width)-80;
            int minSpace = 10;
            
            int cellToSwipe = (scrollView.contentOffset.x)/(pageWidth + minSpace) + (velocity.x < 0 ? 0 : 1); // cell width + min spacing for lines
            if (cellToSwipe < 0) {
                cellToSwipe = 0;
            } else if (cellToSwipe >= MIN(6, self.news.count )) {
                cellToSwipe = (int) MIN(6, self.news.count);
            }
            [self.newsCollectionView scrollToItemAtIndexPath: [NSIndexPath indexPathForRow:cellToSwipe inSection:0]
                                            atScrollPosition: UICollectionViewScrollPositionCenteredHorizontally
                                                    animated: YES];

        }
    }
    
}

Answer 1

You can use layoutAttributesForItem(at indexPath: IndexPath) of the UICollectionViewLayout to calculate a proper contentOffset

The fix could be like that:

extension UICollectionView {
    func scrollTo(indexPath: IndexPath) {
        let attributes = collectionViewLayout.layoutAttributesForItem(at: indexPath)!
        setContentOffset(attributes.frame.origin, animated: true)
    }
}