👀 Views: 87 💬 Answers: 1 📅 Created: 2025-06-08

ios swift uicollectionview

I've hit a wall trying to I'm stuck on something that should probably be simple. I'm experiencing a frustrating issue with my `UICollectionView` in iOS 16. After performing updates to the data source and calling `reloadData()`, the scroll position resets to the top of the collection view instead of maintaining the current offset. This is especially problematic when users have scrolled down to view specific content. I have a `UICollectionView` set up using Auto Layout, and I'm updating the data source based on user input. Here’s a simplified version of the code: ```swift class MyViewController: UIViewController, UICollectionViewDataSource { @IBOutlet weak var collectionView: UICollectionView! var items: [String] = [] override func viewDidLoad() { super.viewDidLoad() collectionView.dataSource = self } func updateItems(newItems: [String]) { items = newItems collectionView.reloadData() } func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return items.count } func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellIdentifier", for: indexPath) // Configure cell return cell } } ``` I’ve tried using `performBatchUpdates(_:completion:)` instead of `reloadData()`, but it results in similar behavior where the scroll position is lost. Additionally, I verified that I'm not inadvertently resetting the content offset elsewhere in the code. I also tried saving the current content offset before the update and restoring it afterward, but that approach is inconsistent and doesn’t always work as expected. This was working fine in previous iOS versions, so I'm wondering if there are any changes in iOS 16 that affect how `UICollectionView` handles layout updates with Auto Layout. Has anyone else encountered this issue, or have suggestions for maintaining scroll position while updating the collection view? I'm working on a API that needs to handle this. The project is a mobile app built with Swift. I'd love to hear your thoughts on this. This is for a application running on Linux.