Crash when using SwiftUI's `.onAppear` with AsyncImage in iOS 17
I'm not sure how to approach I keep running into I'm working on a project and hit a roadblock. I tried several approaches but none seem to work. I am experiencing a crash in my SwiftUI application on iOS 17 when using the `.onAppear` modifier with `AsyncImage`. The app crashes with the behavior message: `Thread 1: Fatal behavior: Unexpectedly found nil while implicitly unwrapping an Optional value`. The crash seems to happen when the view containing the `AsyncImage` is displayed, but only if the image URL is invalid. Here’s a simplified code snippet of what I’m using: ```swift struct ContentView: View { @State private var imageUrl: String = "" var body: some View { VStack { AsyncImage(url: URL(string: imageUrl)) { image in image.resizable().scaledToFit() } placeholder: { ProgressView() } } .onAppear { loadImage() // This function fetches the image URL } } private func loadImage() { // Simulating an API call that might return an invalid URL imageUrl = "https://example.com/invalid-url" } } ``` I’ve added some basic behavior handling in the `loadImage` method, but it seems that the `AsyncImage` does not handle the nil case properly and crashes instead. I’ve tried using a guard statement to check if the URL is valid, but that didn’t prevent the crash. I also looked into the documentation for `AsyncImage`, but I couldn’t find any mention of handling invalid URLs elegantly. Does anyone know how I can prevent this crash or handle it more gracefully? For context: I'm using Swift on Ubuntu. I recently upgraded to Swift 3.10. Has anyone else encountered this? I'd be grateful for any help.