Hi. I have a button that triggers a request to a webservice: struct ContentView: View { @StateObject private var state: State = State() var body: some View { VStack { Button("Request", action: { makeRequest() }) Text(state.response) } } private func makeRequest() { URLSession.shared.dataTask(with: URL(string: "https://my-json-server.typicode.com/typicode/demo/posts/1")!, completionHandler: { data, _, _ in state.response = String(bytes: data!, encoding: .utf8)! }) .resume() } } and an ObservableObject to store the response in: class State: ObservableObject { @Published var response: String = "" } . It seems to workd, but, I get the error message [SwiftUI] Publishing changes from background threads is not allowed; make sure to publish values from the main thread (via operators like receive(on:)) on model updates. So I was wondering if this is the correct way to store the responses of HTTP requests in a StateObject. I also couldn't find anything about receive(on:).

I have a NavigationSplitView and an EditButton in the same ContentView. Both do what they should, except that when I click "Edit" and then "Done", the detail view of the last selected item in my list appears. This happens only after I have clicked one of the list items, not before. This is my code: var body: some View { NavigationSplitView { List(selection: $selectedItem) { ForEach(items, id: \.self) { item in Text(item.timestamp!, formatter: itemFormatter) } .onDelete(perform: deleteItems) } .toolbar { ToolbarItem(placement: .navigationBarTrailing) { EditButton() } ToolbarItem { Button(action: addItem) { Label("Add Item", systemImage: "plus") } } } Text("Select an item") } detail: { NavigationLink(value: selectedItem) { Text("Item") } } } The problem doesn't exist with a NavigationStack. Is there any way to get around this?

Hi. I have a simple view: struct ContentView: View { var body: some View { VStack { List { Text("Test") } } .drawingGroup() } } When I run my app I get an error message Unable to render flattened version of ListRepresentable<SystemListDataSource, SelectionManagerBox>. and a forbidden symbol: This happens only with drawingGroup applied. Can't Lists be rendered with Metal?

I tried the example from https://developer.apple.com/documentation/swiftui/editmode. It's not working for me. struct ContentView: View { @Environment(\.editMode) private var editMode @State private var name = "Maria Ruiz" var body: some View { NavigationView { Form { Text(String(editMode!.wrappedValue.isEditing)) if editMode?.wrappedValue.isEditing == true { TextField("Name", text: $name) } else { Text("test") } } .animation(nil, value: editMode?.wrappedValue) .toolbar { // Assumes embedding this view in a NavigationView. EditButton() } } } } It shows the texts "false" and "test", before and after clicking Edit. What am I missing? I'm using XCode 14.0.1 and the deployment target is iOS 16. I also tried on a real iPhone and on iOS 15.5 in the Simulator. Thanks for any help.

I have a view that is part of a larger view. I have a preview of that part, but XCode draws a device (some iPhone model by default) around it. I can choose a different device with .previewDevice(PreviewDevice(rawValue: "...")). I found a screenshot of what I want to do, so I assume it's possible somehow: Unfortunately where I found the screenshot was not described how to do this. I tried previewDevice(.none), but that at least didn't do what I want. I'm using XCode version 14.3 Release Candidate, but can switch back version 14.2. Does anyone have an idea?