👀 Views: 17 💬 Answers: 1 📅 Created: 2025-06-30

iOS UICollectionView Swift iOS17

I'm deploying to production and Hey everyone, I'm running into an issue that's driving me crazy..... I'm stuck trying to I've been struggling with this for a few days now and could really use some help... I'm sure I'm missing something obvious here, but I've been banging my head against this for hours. I'm working on a personal project and I'm working on a UICollectionView that displays a grid of images, and I've encountered an issue where cells do not update their layout correctly after a device rotation in iOS 17. Initially, everything works fine when the app is first launched. However, after rotating the device from portrait to landscape or vice versa, the cells seem to maintain their previous width and height settings, causing the layout to look broken. I have implemented the collection view with a basic flow layout and set up the delegate methods properly. Here’s a simplified version of my setup: ```swift class MyCollectionViewController: UICollectionViewController { override func viewDidLoad() { super.viewDidLoad() collectionView.collectionViewLayout = UICollectionViewFlowLayout() collectionView.delegate = self collectionView.dataSource = self } override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return 50 // Sample data count } override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! MyCustomCell // Configure cell return cell } } ``` I've also overridden `viewWillTransition(to:with:)` to invalidate the layout: ```swift override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) { super.viewWillTransition(to: size, with: coordinator) collectionView.collectionViewLayout.invalidateLayout() } ``` Despite calling `invalidateLayout()`, the cells do not seem to adjust their size based on the new orientation. I've confirmed that the constraints in my custom cell are set correctly. I've also tried forcing a reload of the collection view data in the transition block: ```swift coordinator.animate(alongsideTransition: { _ in self.collectionView.reloadData() }) ``` However, this still does not resolve the issue. I’m seeing cells with incorrect sizes, and sometimes they overlap or are spaced improperly. I would really appreciate any insights on how to properly handle layout updates after a device rotation in this scenario. Is there a specific method or best practice I might be missing? I'm working on a web app that needs to handle this. I'm working on a application that needs to handle this. Has anyone else encountered this? My development environment is Ubuntu. My development environment is Ubuntu 22.04. I'm developing on macOS with Swift. Has anyone dealt with something similar? I'm developing on Linux with Swift.