Preview layouts in Xcode 14 render the layout in live mode by default. Can this default be changed to "Selectable" permanently? E.g. through an Xcode plist entry? I know there is a manual option to switch to the Selectable option exists in the bottom left.

Recently have been working on this project just fine... had an app throw a warning for some malware called InstallCore. Removed the malware and now I am getting this on every preview, regardless of the device preview type. I've tried clearing derived data, cache, etc. No dice. Could not install the preview host "AppName.app" on iPhone 14 Pro Max: Failed to get parent identifier for BUNDLEIDENTIFIER.

I have an app with some SwiftUI Views. When using preview in Xcode, Xcode creates many instances of the previews. Then I quit Xcode, but the previews are not quit. I have to force quit them in Menu -> Apple Icon Menu -> Force Quit. Has anyone seen the same thing? How to solving it? Xcode 14.3 (14E222b) macOS Ventura 13.3.1 (a) (22E772610a) Mac mini M1 16G 512G

Can't compile existing project with new #Preview macros. Get: 'Preview' is only available in application extensions for iOS 17.0 or newer And because macros generate struct I can't use #available to fix this. Does anyone have any ideas how to fix this? I guess the only solution is to create new macros that will work like #available(iOS 17) { code } and remove the code for older iOS?

When using Xcode's Preview or Simulator, I noticed that my M2 Air will overheat. This hasn't happened before in Ventura or Xcode 14.

It keeps saying "iOS 17.0 Not Installed" and I cannot build and run my app. When I click the "GET" button, a new window popped up and it clearly stated that iOS 17.0 Simulator was installed. I already tried reinstalling Xcode, but the problem is still there. Any suggestion is appreciated!

I have been working on a 3x3 Rubik's cube app for iOS, and I have a timer in it. Whenever I try to add a time and save the context in a preview, it gives an error. func addTime(){ print("Started") formatTime() print("Formatted") withAnimation(){ print(formattedTime) let time = Time(context: viewContext) time.time = formattedTime print(time.time!) do{ print("dostart") try viewContext.save() print("saved") }catch{ let error = error as NSError print("An error occurred: \(error)") fatalError("An error occurred: \(error)") } } } This is the function that adds the time and saves the context.(The prints were for debugging purposes) When this function runs while testing in the preview, the do/catch returns "An error occurred: Foundation._GenericObjCError.nilError" When I try to run this in the simulator, it gives this error in Persistence.swift: If you need it, here is my entire ContentView.swift: import SwiftUI import CoreData var scrambles = ["R' B' L U' B2 D B' D' L R B L2 D' B L' U L2 B2 L B2 R' F L2 B' F' U2 B F' L2 F2", "D' B' L B' F L' B2 U' R2 D' U' L' D' R' F L U2 F' R2 D' B2 L' R' B' L R' U F L B2", "L R B' D' L D' U L2 R' B2 L' D2 U2 R' D' U' L D F' L2 D2 F D2 L' D' U' B' F2 U' B'", "U L2 R D' B2 D2 R2 D2 L2 R U2 R' U L2 D' F' D R B' F2 L' F' L B2 F' D' L R' F2 D"," D' U F L' R' U2 R' D B2 F U' L2 D2 B' L2 B2 R' F' D' U B' L' R' B' F L' B' L R2 D", "D2 U' F2 D' U' B2 F' U' R D2 U R2 D2 R2 U L B F2 D2 U2 B F2 L U2 F' U2 R D' L F'", "F D' U B F2 U' F' L2 B2 F2 U B2 F2 D' B' F' L' R2 B D U' B2 F' L' R B' U2 R2 D2 F'", "B F U2 B2 L U B F L2 R F' L2 F' U2 R B U' B2 U2 B' U2 L R D' U2 B' D L R' U"] var starts = ["Start", "Stop"] struct ContentView: View { @State var start = false @State var startstop = "Start" @State var watch = stopwatch() @State var elapsedTime: Int = 0 @State var timeToSave: Int = 0 @State var minutes: Int = 0 @State var seconds: Int = 0 @State var milliseconds: Int = 0 @State var formattedTime: String = "" @Environment(\.managedObjectContext) private var viewContext @FetchRequest(entity: Time.entity(), sortDescriptors: []) private var timecd: FetchedResults<Time> var body: some View { NavigationView{ VStack{ Text("CubeTimer") .font(.largeTitle) .fontWeight(.bold) .padding(2) Text(scrambles.randomElement()!) .multilineTextAlignment(.center) .padding(.top, 125.0) .padding(.leading, 15) .padding(.trailing, 15) .font(.title) .fontWeight(.bold) if start{ watch .padding(.top, 30) .fontWeight(.bold) .onAppear{ startstop = "Stop" watchToggle() } var timer: Timer { Timer.scheduledTimer(withTimeInterval: 0.01, repeats: true) {_ in elapsedTime += 1 //print("\(minutes).\(seconds)") print("called") print(elapsedTime) //figure out how to stop timer and save time to core data } } } Button(action: { start.toggle() if start == false{ timeToSave = elapsedTime print(timeToSave) print(elapsedTime) watchToggle() buttonToggle() addTime() } //print(start) }){ Text(startstop) }.padding(.top, 7) .font(.system(size: 30)) Spacer() //figure out how to stop timer and save time to core data } List{ ForEach(timecd){time in Text(time.time ?? "Not found") } } } } func buttonToggle(){ if start{ startstop = "Stop" }else{ startstop = "Start" } } func watchToggle(){ print("runs") watch.toggleRun() watch.testForIsRunning() //print(watch.isRunning) } func formatTime(){ print("Formatting") print(timeToSave) minutes = timeToSave / 6000 seconds = (timeToSave % 6000) / 100 milliseconds = timeToSave % 100 print(minutes) print(seconds) print(milliseconds) formattedTime = "\(minutes):\(seconds).\(milliseconds)" } func addTime(){ print("Started") formatTime() print("Formatted") withAnimation(){ print(formattedTime) let time = Time(context: viewContext) time.time = formattedTime print(time.time!) do{ print("dostart") try viewContext.save() print("saved") }catch{ let error = error as NSError print("An error occurred: \(error)") fatalError("An error occurred: \(error)") } } } func buttontext(){ if start{ startstop = "Stop" }else{ startstop = "Start" } } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() } } Could somebody please help me resolve this issue?

Just found the rounded corners of Smart Stack previews are incorrect. They rendered as circular rounded corners, which are not consistent with other Apple Watch previews and also the physical Apple Watch. They should be changed to continuous rounded corners.

Has anyone figured out how to generate sample data for a Preview Container that contains relationships? I've tried numerous ways to get a relationship, but have not had any success. I've searched around the forms and the internet to see if I can find anything, but haven't had any luck. Here is what I have defined for my previewContainter and the sample data structure. I've followed the same pattern that is found in WWDC2023 Build an app with SwiftData. The books and tags are created just fine in memory, and in my SwiftUI previews, I can see these items. Here is what I currently have, but I have also tried running a query after SampleData.books.forEach(container.mainContext.insert(object: )) and then using one of the returned items for the relationship, but every query I perform in here returns an empty result. Am I barking up the wrong tree with my approach, or is this a known issue that I have not come across? @MainActor let previewContainer: ModelContainer = { do { let container = try ModelContainer( for: [Project.self, Recipe.self, Tag.self], ModelConfiguration(inMemory: true) ) // Add in sample data SampleData.books.forEach(container.mainContext.insert(object: )) SampleData.tags.forEach(container.mainContext.insert(object: )) SampleData.recipes.forEach(container.mainContext.insert(object: )) return container } catch { fatalError("Failed to create preview container") } }() struct SampleData { static let books: [Book] = { return (1...5).map({ Book(title: "Sample Book #\($0)") }) }() static let tags: [Tag] = { return (1...5).map({ Tag(name: "Sample Tag #\($0)") }) }() static let recipes: [Recipe] = { (1...5).map({ Recipe(name: "Sample Recipe #\($0)", book: Self.books.first!) }) }() } Thanks

Hey all, I was just wondering what would be the best/easiest way to have a sample for any MusicItem to use in SwiftUI previews. I know I could convert one into a string and then decode (as it conforms to Codable) but maybe there is a way that would make it easier to setup? if not I might file a feedback for this as I think it would be great if all MusicItem structures would have a .example or something like that so for a view you'd have #Preview { SongTitlesView(song: Song.example) }

I am not able to present the preview of xcode 15, I am having the error message "Cannot preview in this file" "Syntax error" but I have no error in xcode.

Hiya, I am having issues trying to use previews in the xcode 15 beta, i am using an M2 macbook air with 8gb of ram. I am using MacOS Sonoma and iOS 17.0 Beta 1 and am struggling using previews, the base simulator works but no previews. I am not receiving any error so am very confused. Any help would be majorly appreciated. Thanks, Gus

Hey guys, So I am just starting out and for the life of me I cannot figure out how to match the preview I am seeing in the apple Landmarks swiftUI tutorial as seen above the phone here: and again when looking at these 2 rows: My live preview settings seem to be at the bottom, and look different from the tutorial: As you can see as well, in my layout I need to click between the 2 views while the tutorial layout shows both at the same time. I have searched all over and can't seem to figure out why they are different. If someone could just let me know I would appreciate it!

After updating to Xcode 15 Beta 2, my app stopped building due to complaints that the extensions I defined on MKCoordinateRegion don't exist when used in the Preview. Interestingly, there are no exceptions when these extensions are used elsewhere in the app. Here's a small code example that I created: Notice that the exception is only thrown in the preview and not in the body of the struct. This behavior was working as expected in Xcode 15 Beta 1. Furthermore, this issue arises only when the target is an iPhone or iPad. If I switch the target to Vision Pro, the app builds successfully.

On the beta version of Xcode, when we preview our app, some information is missing. We can see that on version 16.4 preview all the info is there, and on the contrary on version 17 two pieces of info are missing... (Photos) On iOS 17.0 (Xcode Beta 15.0) On iOS 16.4 (Xcode Normal Version) If anyone can help me tell me I will give you my code. Thank you so much sayan

Hi developers. I can't get the simulator to work, I have tried to reinstall Xcode,i know there isn't any errors, every time I put the code in then I says successful with the simulation, but nothing is happening, I have tried it with virtuel phone and my physical phone, and its the same thing. i have linked to the code, hope your guys can help me. https://github.com/hyperoslo/BarcodeScanner.git