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

swift uicollectionview swiftui combine ios16 Swift

I'm collaborating on a project where I'm dealing with I'm trying to implement I'm working on a project and hit a roadblock..... I'm working with an scenario where my `UICollectionView` is not reflecting updates to its data source when using SwiftUI. I'm working with Xcode 14 and targeting iOS 16. My setup involves a `UICollectionView` within a `UIViewControllerRepresentable`, and I’m using Combine to handle data updates. Here’s the relevant code snippet for my `UICollectionView`: ```swift struct MyCollectionView: UIViewControllerRepresentable { @Binding var items: [String] func makeUIViewController(context: Context) -> UICollectionViewController { let layout = UICollectionViewFlowLayout() let controller = UICollectionViewController(collectionViewLayout: layout) controller.collectionView.dataSource = context.coordinator controller.collectionView.delegate = context.coordinator return controller } func updateUIViewController(_ uiViewController: UICollectionViewController, context: Context) { uiViewController.collectionView.reloadData() } func makeCoordinator() -> Coordinator { Coordinator(self) } class Coordinator: NSObject, UICollectionViewDataSource, UICollectionViewDelegate { var parent: MyCollectionView init(_ parent: MyCollectionView) { self.parent = parent } func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return parent.items.count } func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) // Configure cell return cell } } } ``` The question arises when I update the `items` array in my parent view which is bound to the `MyCollectionView`. Although the `items` array gets updated, the collection view does not refresh its display. I have verified that `updateUIViewController` is being called, but the `reloadData()` method does not seem to trigger a refresh. Additionally, I am observing the following behavior in the console: `UICollectionViewFlowLayout invalidates layout during enumeration in -[UICollectionViewDataSource collectionView:numberOfItemsInSection:]`. I suspect there might be an scenario with the way binding and updates are being handled, but I’m not sure how to resolve it. I've tried calling `collectionView.reloadData()` from within the `Coordinator` as well, but still no luck. Any insights on how to correctly update the `UICollectionView` in this scenario would be greatly appreciated! For context: I'm using Swift on Windows. Thanks in advance! I'm working on a service that needs to handle this. Thanks in advance! I'm developing on Windows 11 with Swift. I'm working on a web app that needs to handle this. Is this even possible? I'm working with Swift in a Docker container on Ubuntu 22.04. Has anyone else encountered this? What am I doing wrong?