👀 Views: 410 💬 Answers: 1 📅 Created: 2025-06-11

ios swift uicollectionview Swift

Could someone explain Quick question that's been bugging me - This might be a silly question, but I'm working with an scenario where my `UICollectionViewCell` does not update properly when the underlying data source changes in an iOS 17 app built with Swift... I have a `UICollectionView` that displays a list of items, and I'm using a simple model that holds the data. Whenever I add a new item to the data source and call `collectionView.reloadData()`, the cell displaying the new item does not show the updated content. Instead, it's displaying stale data. I have confirmed that the data source has been updated correctly before the reload. Here’s the relevant part of my code: ```swift class MyViewController: UIViewController, UICollectionViewDataSource { var items: [String] = [] @IBOutlet weak var collectionView: UICollectionView! override func viewDidLoad() { super.viewDidLoad() collectionView.dataSource = self } func addItem(_ item: String) { items.append(item) 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: "MyCell", for: indexPath) as! MyCustomCell cell.label.text = items[indexPath.item] return cell } } ``` I have also tried using `performBatchUpdates` with `collectionView.insertItems(at:)`, but it didn't resolve the scenario either. I suspect that it might be related to how the cells are being reused, but I can’t pinpoint the question. I am not seeing any errors in the console, but the UI does not reflect the changes in the data source. Does anyone have insights on how to ensure `UICollectionView` cells are updated correctly when the data source changes? Any help would be appreciated! I'm working on a CLI tool that needs to handle this. How would you solve this? My development environment is macOS. What's the best practice here? For reference, this is a production mobile app. Thanks, I really appreciate it! My development environment is Debian. Any ideas what could be causing this?