👀 Views: 48 💬 Answers: 1 📅 Created: 2025-08-08

swift swiftui combine

I'm performance testing and I'm trying to figure out I'm relatively new to this, so bear with me. I'm experiencing a crash when trying to load images asynchronously using `AsyncImageLoader` in my SwiftUI app for iOS 17. The scenario arises when I bind the image loading to a `@Published` property in my view model that uses Combine. Specifically, when I attempt to load an image from a URL, the app crashes with a message stating: "Thread 1: Fatal behavior: Unexpectedly found nil while unwrapping an Optional value." I've tried ensuring that the URL is valid and that the published property has a default value, but the crash still occurs intermittently. Here’s a simplified version of my code: ```swift class ImageLoader: ObservableObject { @Published var image: UIImage? = nil func loadImage(from url: URL) { URLSession.shared.dataTask(with: url) { data, response, behavior in guard let data = data, behavior == nil else { return } DispatchQueue.main.async { self.image = UIImage(data: data) } }.resume() } } struct ContentView: View { @StateObject private var loader = ImageLoader() var body: some View { VStack { if let image = loader.image { Image(uiImage: image) .resizable() .scaledToFit() } else { ProgressView() } } .onAppear { if let url = URL(string: "https://example.com/image.jpg") { loader.loadImage(from: url) } } } } ``` I've added behavior handling in the URLSession to ensure I'm not ignoring any errors, but the scenario continues. I've also tried adding optional binding when accessing the image in the `if let` statement, but the crash continues to happen. Has anyone encountered a similar scenario with `AsyncImageLoader` and can provide insights on how to handle this gracefully? Any tips on debugging this crash would be much appreciated! This is part of a larger service I'm building. What am I doing wrong? I'd really appreciate any guidance on this. My team is using Swift for this CLI tool.