UICollectionView scrollToItem broken on iOS14

Same problem here. I made onboarding screen using collection view without any supplementary items with orthogonalScrollingBehavior = .groupPagingCentered, and scrollToItem(at:at:animated:) doesn't work on iOS 14, but works fine on iOS 13. Thanks for temporary solution with .continuousGroupLeadingBoundary, but I hope it would be fixed in iOS 14.1+

Same here. I hope it gets fixed soon.

iOS 14.1 does not fix it.

Since iOS 14.1 does not fix it, I am sharing a work around solution that I am using.

1. create a boolean flag and set orthogonalScrollingBehavior as following:

Code Block swift
orthogonalScrollingBehavior = flag ? .continuousGroupLeadingBoundary :  .groupPagingCentered

2. call scrollToItem like this:

Code Block swift
flag = true
collectionView.collectionViewLayout.invalidateLayout()
collectionView.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: false)
flag = false
collectionView.collectionViewLayout.invalidateLayout()

Still the same on iOS 14.2

Hi, i had a same issue with collection view on iOS 14 and i found out, if you have paging enabled on your collection view, method scrollToItem will do nothing. Workaround for this is to set paging on false before this method and then turn it back to true.

self.collectionView.isPagingEnabled = false
self.collectionView.scrollToItem(at: indexPath, at: .left, animated: false)
self.collectionView.isPagingEnabled = true

This is temporary solution for this bug on iOS14. Hope this will help someone and save their time :)

self.collectionView.layoutIfNeeded()
self.collectionView.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: false)

Solve the problem for me.

Is this fixed in 14.4? Is this bug found on iOS only? Is it applied to tvOS as well?

Not fixed in 14.4

Not fixed in 14.5 RC

Not fixed iOS 14.5, Xcode 12.5.

I use this behavior until fix:

self.collectionView.isPagingEnabled = false
self.collectionView.scrollToItem(at: indexPath, at: .left, animated: false)
self.collectionView.isPagingEnabled = true

Hi All

Where we have to put this code?

self.collectionView.isPagingEnabled = false
self.collectionView.scrollToItem(at: indexPath, at: .left, animated: false)
self.collectionView.isPagingEnabled = true


In my scenario, Let's suppose there are 5 items to show in Collection View Horizontally and we navigate to another screen, where we make some setting change. Due to this server response will change.

When we come back on Collection View Screen and make api call for getting updated data but collection views are not updating. It's show old cell and due to this app gets crash, because we are getting updated data from server.

I called colletionview.reloadData() when get response from server and inside collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) method getting indexPath.row value old one and not updated.

This problem is only on iOS 14.5 version. On old versions app working fine.

Thanks
Gaurav

Seems to be fixed for me with iOS 15 SDK (Xcode 13 required).

Moreover, it's started to work on iOS 14 too (tested on iOS 14.5 Simulator for iPad Pro 9.7 inch, iPhone 8, iPhone 11). I recommend to test this issue again on Xcode 13 and remove workarounds if it works for you too.

This worked for me. didEndDisplaying denotes collectionView is now ready to scroll

firstTimeScrollClosure = {
    collectionView.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: false)
}

func collectionView(_ collectionView: UICollectionView, didEndDisplaying cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
        firstTimeScrollClosure?()
        firstTimeScrollClosure = nil
}