Suppose you have a view: struct Library: View { @State var books = [] var body: some View { VStack { ... Button("add Book") { .... } } } Such that Library view holds a Book array that gets populated internally via a button that opens a modal – or something alike. How can I use #Peviews to preview Library with a pre-populated collection? Suppose I have a static books – dummy – array in my code just for that; still, what's the best way to use that to preview the Library view?

How do I gain access to the Documents folder? Under targets, "signing and capabilities", App Sandbox, I can see the Music folder, Desktop... but not Documents.

In order to setup a preview, I need to create a Book; to do that, I need to await a function – however, one cannot await inside a Preview: import SwiftUI struct BookView: View { let book: Book var body: some View { VStack { Image(book.thumbnail, scale: 1.0, label: Text(book.title)) } } } #Preview { let url = URL(filePath: "/Users/dan/Documents/Curs confirmare RO.pdf")! // 👇 here, `createBook` should be awaited; but how? let book = createBook(for: url, of: CGSize(width: 254, height: 254), scale: 1.0) BookView(book: book) }

I have a SwiftUI view of the form struct ContentView: View { // ... .onDrop(of: [.pdf], isTargeted: $isDropTargeted) { pdfs in for pdf in pdfs { I'm just not sure what to do next, I see there's a loadPreviewImage() that if I use like: Task.detached { // returns any NSSecureCoding object let image = try! await pdf.loadPreviewImage() } Not sure how I'm supposed to get my preview image from that NSSecureCoding object

I'm trying to create and advertise a Bonjour service via Network.framework. In Xcode, target, Info tab, I've added the entry to plist: And then written the following code: guard let listener = try? NWListener(service: .init(name: "My Printer Service", type: "_printer._tcp"),using: .tcp) else { return nil } self.listener = listener listener.stateUpdateHandler = { newState in switch newState { case.ready: print("starting") case .failed(let error): print("error: \(error)") default: print(newState) } } listener.start(queue: .main) However, the status is failed with error message: POSIXErrorCode(rawValue: 22): Invalid argument

Apple Music's "Automatic Downalods" checkbox does not stay checked when saving settings and does not work at all. Note this was broken for me for a long, long, time (Catalina?).

The code for @State doesn't seem to work. struct DonutListView: View { var donutList: DonutList @State private var donutToAdd: Donut? var body: some View { List(donutList.donuts) { DonutView(donut: $0) } Button("Add Donut") { donutToAdd = Donut() } .sheet(item: $donutToAdd) { // <-- would need a "donut in" TextField("Name", text: $donutToAdd.name) // <-- donutToAdd is optional and I'm not sure how it would be unwrapped Button("Save") { donutList.donuts.append(donutToAdd) donutToAdd = nil } Button("Cancel") { donutToAdd = nil } } } } Does anyone have a fix for this? Thanks, Dan!

I want to display a simple message while waiting for a list to be populated. Something like Loading... and when the list starts being populated with even one item, remove the message, via a transition, and display the list. My current attempt, that does not work, looks like: struct JoinChannelView: View {     @Binding var rooms: [ChannelInfo]     @State var selectedRoom: String?     var body: some View {         VStack {             if $rooms.isEmpty {                 Text("Loading...")                     .transition(.slide)             } else {                 List(selection: $selectedRoom) {                     ForEach(rooms, id: \.title) { room in                         Text(room.title)                             .font(.title)                         Text(room.description)                             .font(.subheadline)                     }                     .padding(.bottom)                 }             }         }         .frame(width: 150, height: 300)     } }

I want to have a single selection in a List, holding content of a custom struct: struct ChannelInfo: Hashable {     let title: String     let description: String } And the view: struct JoinChannelView: View {     @Binding var rooms: [ChannelInfo]     @State var selectedRoom: String?     var body: some View {         VStack {             if $rooms.isEmpty {                 Text("Loading...")                     .transition(.slide)             } else {                 List(selection: $selectedRoom) {                     ForEach(rooms, id: \.title) { room in                         Text(room.title)                             .font(.title)                         Text(room.description)                             .font(.subheadline)                     }                     .padding(.bottom)                 }             }         }         .frame(width: 150, height: 300)     } } My problem here is, that because inside the ForEach I render two Text views, both are selectable, but that's incorrect, I only want the title, the first Text to be selectable.

In XCode, if I hit a breakpoint, I can't view the value of some local variables: I've read about disabling optimisations for debugging, but that's already done

Currently NaviagitonView on macOS creates a side panel. And then navigationViewStyle does not support stack view for macOS. Given this, is there currently a method to totally switch the content of a window from one view to another on macOS?

For iOS NavigationLinks provide a good way to completely transition from one "screen" (view) to another. In macOS however, NavigationLinks don't completely switch the whole contents of a screen to another. What I want to achieve is to make a Button press trigger a transition from one screen to another.