I want to share UserDefaults between main App and macOS Widget, in iOS I can do it using AppGroups, but how to do it between macOS Widget and main App, because macOS widget's AppGroup require to use "Team Identifier" as prefix and main App's AppGroup require prefix to be "group" so how can I share UserDefaults between the two?

We've got hundreds of crashes in our SwiftUI app which we think are "silent" crashes as there are no complaints from clients and yet - it happens on the main thread in the foreground so I'm not completely sure. The annoying thing is that we have no idea by the stack trace what is causing this issue, I feel helpless as this is causing some very loud noise through management and honestly - myself who wants to have this noise cleared. this particular crash is the highest impact (one of a few different weird crashes in our app without clear stack trace) 0 SwiftUI 0x895d90 OUTLINED_FUNCTION_2 + 836 1 SwiftUI 0x895da8 OUTLINED_FUNCTION_2 + 860 2 SwiftUI 0x1329880 OUTLINED_FUNCTION_2 + 424 3 SwiftUI 0x6806c OUTLINED_FUNCTION_441 + 584 4 SwiftUI 0x481b0 OUTLINED_FUNCTION_194 + 544 5 UIKitCore 0x1b7194 -[UIViewController removeChildViewController:notifyDidMove:] + 128 6 UIKitCore 0x77d6e8 -[UINavigationController removeChildViewController:notifyDidMove:] + 80 7 UIKitCore 0x205224 -[UIViewController dealloc] + 768 8 UIKitCore 0x1036c -[UINavigationController viewDidDisappear:] + 372 9 UIKitCore 0xd9c4 -[UIViewController _setViewAppearState:isAnimating:] + 1012 10 UIKitCore 0x46e61c -[UIViewController __viewDidDisappear:] + 136 11 UIKitCore 0x7ec024 __64-[UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]_block_invoke_3 + 44 12 UIKitCore 0x1a3f24 -[UIViewController _executeAfterAppearanceBlock] + 84 13 UIKitCore 0x1a3e68 -[_UIAfterCACommitBlock run] + 72 14 UIKitCore 0x1a3d9c -[_UIAfterCACommitQueue flush] + 176 15 UIKitCore 0x1a3ca8 _runAfterCACommitDeferredBlocks + 496 16 UIKitCore 0x3f530 _cleanUpAfterCAFlushAndRunDeferredBlocks + 108 17 CoreFoundation 0x43564 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 28 18 CoreFoundation 0xabd9c __CFRunLoopDoBlocks + 368 19 CoreFoundation 0x7bbbc __CFRunLoopRun + 856 20 CoreFoundation 0x80ed4 CFRunLoopRunSpecific + 612 21 GraphicsServices 0x1368 GSEventRunModal + 164 22 UIKitCore 0x3a23d0 -[UIApplication _run] + 888 23 UIKitCore 0x3a2034 UIApplicationMain + 340 24 SwiftUI 0x1d1014 OUTLINED_FUNCTION_895 + 2420 25 SwiftUI 0x13216c block_copy_helper.1 + 388 26 SwiftUI 0x11b4bc OUTLINED_FUNCTION_901 + 2868 Number 27 will be our app's Main function and that it - no other trace of our apps code. Firebase is saying this happens 100% on iOS 16 only and always on the foreground. How can I get to the bottom of this? how can I debug such a crash?

We have separated much of our UI into different packages to reduce complexity and compile time. When we recently tested using new .xcstrings string catalogs, we hit an unexpected problem. Strings extracted from SwiftUI components like Text or Button are extracted into the Localizable.xcstrings in the same package, but the default behaviour of Text(_ key:tableName:bundle:comment:) is to use Bundle.main. When the default behaviour of the string extraction isn't to extract to the main app target, this introduces a very fragile system where it's easy to add code that looks localised, but ends up failing lookup at runtime. I don't feel comfortable that we will always remember to define the correct module every time we create a Text. Also, other components like Button doesn't have an init that takes a Bundle, so we would also have to remember that Button(_ titleKey:action:) can now only be used in a package if we make sure that the main bundle contains a matching key. Is there a way for us to make sure that strings are always extracted to the same place as they are resolved against by default? Either by having strings in packages extracted to an xcstrings file in the main app or having Text default to resolving against the module bundle by default?

In my Watch app on watchOS 9 I was using .foregroundColor(myColour) to colour the text in a widgetLabel on a corner complication like this: let myColour: Color = functionThatReturnsAColorObjectConstructedLike Color.init(...) // green .widgetLabel { Text(myText) .foregroundColor(myColour) } It worked fine; the widget label was green. Now, in watchOS 10, I see that foregroundColor() is being deprecated in favour of foregroundStyle(), and I can use .foregroundStyle(.green), and - importantly - foregroundStyle() is only available on watchOS 10 and newer. myColour is calculated depending on some other info, so I can't just write .green, and when I use .foregroundStyle(myColour) the widget label comes out as white every time, even if I set myColour = .green. I think I have to use some sort of extension to pick the right combination, something like: extension View { func foregroundType(colour: Colour, style: any ShapeStyle) -> some THING? { if #available(watchOS 10.0, *) { return foregroundStyle(style) } else { return foregroundColor(colour) } } } // Usage let myStyle: any ShapeStyle = SOMETHING? ... .widgetLabel { Text(myText) .foregroundType(colour: myColour, style: myStyle) It doesn't work. I just can't figure out what should be returned, nor how to return it. Any ideas?

I'm running into an issue with using .topBarTrailing placement for a toolbar item. The app fails to launch (crashes) with this placement. The following view works fine with any other placement (other than .topBarLeading). What am I doing wrong? var body: some View { NavigationStack { Text("Overview") .toolbar { ToolbarItem(placement: .topBarTrailing) { Button { // noop } label: { Label("Add", systemImage: "plus") } } } .navigationTitle("Overview") .navigationBarTitleDisplayMode(.inline) } } I've opted to use .confirmationAction as a workaround, which works fine. It also positions the toolbar item in the same place on the view as the .topBarTrailing placement would. I'm using Xcode version 15.0 and targeting WatchOS 10. Verbose error output when trying to run the app in the simulator: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Layout requested for visible navigation bar, <PUICStackedNavigationBar: 0x100e1e8d0; baseClass = UINavigationBar; frame = (0 0; 198 60); opaque = NO; autoresize = W; layer = <CALayer: 0x60000027c280>> delegate=0x101877800 standardAppearance=0x60000261cc60, when the top item belongs to a different navigation bar. topItem = <UINavigationItem: 0x100f11230> title='Overview' style=navigator, navigation bar = <PUICStackedNavigationBar: 0x100f22a80; baseClass = UINavigationBar; frame = (0 0; 198 60); opaque = NO; autoresize = W; layer = <CALayer: 0x6000002887c0>> delegate=0x101069600 standardAppearance=0x60000261f3c0, possibly from a client attempt to nest wrapped navigation controllers.'

I found an issue when implementing an alert with a TextField to input a name. I want the action button to be disabled until a name has been entered, but the action block is never executed when the button has become enabled and pressed. The problem seems to appear only when name is initially an empty string. Tested with iOS 17.0. struct MyView: View { @State private var name = "" var body: some View { SomeView() .alert(...) { TextField("Name", text: $name) Button("Action") { // Action }.disabled(name.isEmpty) Button("Cancel", role: .cancel) {} } } }

Hi. I am very new to SwiftUI and still trying to learn. I just encountered a very weird problem that I can't figure out. I have an iPad application that runs on Apple Silicon Macs as "Designed for iPad"; for some reason, this issue only comes up when running it on a Mac, even if the code is exactly the same. This is the view that's causing issues: struct ProfileEditView: View { @EnvironmentObject var mainModel: MainViewModel @EnvironmentObject var authModel: AuthViewModel [some other stuff] var body: some View { GeometryReader { geo in VStack(spacing: 20) { navigationBar() .padding(.horizontal, 3) if authModel.user != nil { VStack(alignment: .leading, spacing: 30) { PhotosPicker(selection: self.$imageSelection, matching: .images, preferredItemEncoding: .compatible) { ProfilePicView(editIconShown: true) } .disabled(authModel.profilePicIsLoading) .padding(.horizontal, geo.size.width * 0.3) .padding(.bottom) VStack(spacing: 10) { if let error = self.error { Text(error) .foregroundStyle(Color.red) .font(.footnote) .italic() } SettingsTextFieldView(String(localized: "Your name:"), value: self.$name) { if nameIsValid { authModel.updateName(self.name) } } } Spacer() actions() } .padding(.horizontal, 5) .padding(.top) .onAppear { self.name = authModel.user!.name } } } .padding() } } } Obviously, I am injecting the ViewModels instances at the app entry point: @main struct MyApp: App { @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate @StateObject var authViewModel: AuthViewModel = AuthViewModel() @StateObject var mainViewModel: MainViewModel = MainViewModel() @StateObject var statsViewModel: StatsViewModel = StatsViewModel() @StateObject var purchaseViewModel: PurchaseViewModel = PurchaseViewModel() @State var revenueCatIsConfigured: Bool = false init() { // MARK: Firebase configuration FirebaseConfiguration.shared.setLoggerLevel(.min) FirebaseApp.configure() // MARK: RevenueCat configuration if let uid = AuthViewModel.getLoggedInUserID() { Purchases.logLevel = .error Purchases.configure(withAPIKey: "redacted", appUserID: uid) self.revenueCatIsConfigured = true } } var body: some Scene { WindowGroup { MainView() .environmentObject(authViewModel) .environmentObject(mainViewModel) .environmentObject(statsViewModel) .environmentObject(purchaseViewModel) } } } And lastly, ProfileEditView that is causing issues, is a subview of MainView: MainView has a switch statement, based on the selected tab; one of the possible views is SettingsView, which can show ProfileEditView as a sheet modifier. For some reason, only when running on mac, I get the error Thread 1: Fatal error: No ObservableObject of type AuthViewModel found. A View.environmentObject(_:) for AuthViewModel may be missing as an ancestor of this view. This will come up every time I reference authModel in this view alone. Both the iPad and iPhone versions work just fine, and again, the code is exactly the same, since it's a "Designed for iPad". I don't even know how to troubleshoot the issue.

I have enabled “StrictConcurrency” warnings in my project that uses SwiftUI. I have a Commands struct. It has a Button, whose action is calling an async method via Task{}. This builds without warnings within Views, but not Commands. There the compiler reports “Main actor-isolated property 'body' cannot be used to satisfy nonisolated protocol requirement”. Looking at SwiftUI: In View, body is declared @MainActor: @ViewBuilder @MainActor var body: Self.Body { get } In Commands, body is not declared @MainActor: @CommandsBuilder var body: Self.Body { get } So the common practice of making a Button action asynchronous: Button { Task { await model.load() } } label:{ Text("Async Button") } will succeed without warnings in Views, but not in Commands. Is this intentional? I've filed FB13212559. Thank you.

I can set color of the SF symbol image in the application window but cannot do the same in the menu bar. I wonder how I can change the color in the menu? import SwiftUI @main struct ipmenuApp: App { var body: some Scene { MenuBarExtra { Image(systemName: "bookmark.circle.fill") .renderingMode(.original) .foregroundStyle(.red) } label: { Image(systemName: "bookmark.circle.fill") .renderingMode(.original) .foregroundStyle(.red) } } } xcodebuild -version Xcode 15.0 Build version 15A240d

I'm experiencing a peculiar issue with SwiftUI's TextField. Whenever I long-press on the TextField, the console outputs an error about passing an invalid numeric value (NaN, or not-a-number) to the CoreGraphics API. This issue persists even in a new Xcode project with minimal code. Code Snippet: import SwiftUI struct ContentView: View { @State private var text: String = "" var body: some View { TextField("Placeholder", text: $text) } } Error: this application, or a library it uses, has passed an invalid numeric value (NaN, or not-a-number) to CoreGraphics API and this value is being ignored. Please fix this problem. Steps to Reproduce: Create a new SwiftUI project in Xcode. Add a TextField to the ContentView. Run the app on a device or simulator. Long-press inside the TextField. What I've Tried: Updating to the latest version of Xcode and iOS. Using UIViewRepresentable to wrap a UIKit UITextField. Creating a new Xcode project to isolate the issue. None of these steps have resolved the issue. Questions: Has anyone else encountered this problem? Are there any known workarounds for this issue? Is this a known bug, and if so, has it been addressed in any updates?

Hi! I find this code does not work as expected on iOS 17 simulator and device. It was working correctly with iOS 16: struct ContentView: View { @State private var numberText = "" var color: Color { let result = (Int(numberText) ?? 0) <= 0 if result { return .black } return .red } var body: some View { VStack { TextField("Enter a number", text: $numberText) .font(.title) .foregroundStyle( color ) Text("Font color will turn red if number > 0") .foregroundColor(.gray) } .padding() } } I tried a workaround and it works: struct ContentView: View { @State private var numberText = "" @State private var color = Color.black func updateColor() ->Color { let result = (Int(numberText) ?? 0) <= 0 if result { return .black } return .red } var body: some View { VStack { TextField("Enter a number", text: $numberText) .font(.title) .foregroundStyle( color ) .onChange(of:numberText) { color = updateColor() } Text("Font color will turn red if number > 0") .foregroundColor(.gray) } .padding() } }

I have two main models, House and Expense. On the home page I show a list of the three most recent expenses using the following query: var descriptor = FetchDescriptor<Expense>(predicate: #Predicate { $0.houseID == house.id }, sortBy: [SortDescriptor(\.date, order: .reverse)]) descriptor.fetchLimit = 3 _recentExpenses = Query(descriptor) I have a NavigationLink that takes you to the full list of expenses: NavigationLink { ExpenseListView(house: house) } label: { Text("See all") } On this page I have a query similar to the previous one, without the fetch limit: let descriptor = FetchDescriptor<Expense>( predicate: #Predicate { $0.houseID == house.id} ) _expenses = Query(descriptor) The problem is that when I click on the navigation link to go to the expenses page, the app freezes. I tried passing the expenses array to the second page instead of invoking another query, but this way the view doesn't update when I update the expenses. Is there a way to solve this problem? Or a way to pass a Binding of the fetched results?

When using the Navigation Stack with paths, I've faced an issue where tapping the 'back' button on the custom navigation bar results in a blank screen. With light theme the screen is white, when using dark theme the screen is black. I've found a decision with using an environment value to dismiss a single screen when needed. However, the problem becomes more prominent when I want to pop back to the root view. This issue has become since updating to iOS 17.

I want to recreate an user experience like in the settings app in tvOS. Therefore I have a HStack with some content on the left side and a List of NavigationLinks on the right side. However a focused link in the list gets clipped on the left side. I tried paddings and spacers and what not, but nothing helped. Is this is a bug or am I missing something? Here is some example code to show the problem: struct ContentView: View { var body: some View { NavigationStack { HStack(spacing: 20) { VStack(alignment: .center) { Image(systemName: "globe") .imageScale(.large) .foregroundStyle(.tint) Text("Hello, world!") } List { ForEach(SomeViewEnum.allCases) { someView in NavigationLink(someView.rawValue, value: someView) } } .navigationDestination(for: SomeViewEnum.self) { someView in Text(someView.rawValue) } } } } } And a screenshot to show the problem:

After upgrading to iOS 17 I am struggling to get decimals working in my app - here is a sample code: for clarity I provide a complete "working" sample (I am pulling data from a back-end server using json, etc - all of that is working ok, it's the UI issue - see below): Model import Foundation struct TestFloat: Encodable { var testFloatNumber: Float = 0 } Observable Class import Foundation class TestFloatViewModel: ObservableObject { @Published var testFloat = TestFloat() } View struct TestFloatView: View { @ObservedObject var testFloatVM: TestFloatViewModel let formatter: NumberFormatter = { let formatter = NumberFormatter() formatter.numberStyle = .decimal return formatter }() var body: some View { VStack { HStack { Text("Enter Float Number") Spacer() } Spacer() .frame(height: 2.0) HStack { TextField("Enter Float Number", value: $testFloatVM.testFloat.testFloatNumber, formatter: formatter) .keyboardType(.decimalPad) .textFieldStyle(.roundedBorder) } } } } This is working on a device with iOS16; however when run on device with iOS17: you can enter maximum four digits? using backspace you can delete all numbers apart of the first one you cannot enter the decimal (.) at all even though decimal keyboard is provided Any help is greatly appreciated.

I'm working on a NavigationStack based app. Somewhere I'm using: @Environment(\.dismiss) private var dismiss and when trying to navigate to that view it gets stuck. I used Self._printChanges() and discovered the environment variable dismiss is changing repeatedly. Obviously I am not changing that variable explicitly. I wasn't able to reproduce this in a small project so far, but does anybody have any idea what kind of thing I could be doing that might be causing this issue? iOS 17.0.3

I am using public struct ShareLink<Data, PreviewImage, PreviewIcon, Label> : View where Data : RandomAccessCollection, PreviewImage : Transferable, PreviewIcon : Transferable, Label : View, Data.Element : Transferable {} And it is generating entitlement errors and not working reliably ( will transfer 1-3 items, but not 4+ ; will not work a second time) Error is: Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "(originator doesn't have entitlement com.apple.runningboard.primitiveattribute AND originator doesn't have entitlement com.apple.runningboard.assertions.frontboard AND target is not running or doesn't have entitlement com.apple.runningboard.trustedtarget AND Target not hosted by originator)" UserInfo={NSLocalizedFailureReason=(originator doesn't have entitlement com.apple.runningboard.primitiveattribute AND originator doesn't have entitlement com.apple.runningboard.assertions.frontboard AND target is not running or doesn't have entitlement com.apple.runningboard.trustedtarget AND Target not hosted by originator)}> Received port for identifier response: <> with error:Error Domain=RBSServiceErrorDomain Code=1 "Client not entitled" UserInfo={RBSEntitlement=com.apple.runningboard.process-state, NSLocalizedFailureReason=Client not entitled, RBSPermanent=false} elapsedCPUTimeForFrontBoard couldn't generate a task port Received port for identifier response: <> with error:Error Domain=RBSServiceErrorDomain Code=1 "Client not entitled" UserInfo={RBSEntitlement=com.apple.runningboard.process-state, NSLocalizedFailureReason=Client not entitled, RBSPermanent=false} elapsedCPUTimeForFrontBoard couldn't generate a task port Received port for identifier response: <> with error:Error Domain=RBSServiceErrorDomain Code=1 "Client not entitled" UserInfo={RBSEntitlement=com.apple.runningboard.process-state, NSLocalizedFailureReason=Client not entitled, RBSPermanent=false} Code is import SwiftUI var images = Array<Image?>(repeating: nil , count: 200); struct ShareTestGContentView: View { let columns = [GridItem(.fixed(165)), GridItem(.fixed(165))] private let twoColumnGrid = [ GridItem(.flexible(minimum: 40), spacing: 2), GridItem(.flexible(minimum: 40), spacing: 2) ] @State var selected = Set() var body: some View { topSection() ScrollView { LazyVGrid(columns: twoColumnGrid, spacing: 2) { // columns: [GridItem(.flexible())]) { ForEach(1...100, id: \.self) { idx in var cr = ( selected.contains(idx) ? 16.0 : 0 ) var lw = ( selected.contains(idx) ? 8.0 : 0 ) VStack{ Button(action: { if selected.contains(idx) { selected.remove(idx); cr = 0.0; lw = 0.0 } else { selected.insert(idx); cr = 16.0; lw = 8.0 } } , label: { AsyncImage(url :URL(string: "https://picsum.photos/800/800?\(idx)")) { image in let _ = ( images[idx] = image.image ) image.image }.frame(width: boxHalf,height:boxHalf).drawingGroup() }) }.overlay( RoundedRectangle(cornerRadius: cr).stroke(Color.yellow, lineWidth: lw) ).drawingGroup() } } } } func topSection() -> some View { let imgarray = selected.compactMap { images[$0] } return HStack { ShareLink("",items: imgarray) { img in SharePreview("images", image: Image(systemName: "captions.bubble.fill")) } } } } #Preview { ShareTestGContentView() }

Hello all, I am playing with MapKit for SwiftUI, so far so good. There is one thing I have not seen any documentations, or sample codes around and that's elevation data, e.g. My questions are: Is there a way to get this information from an MKRoute? Is it possible to get the elevation gain/drop at a given point in the route? Many thank in advance for your help.

Hi all, I've spent 3 of my 'coding-time' sessions already on trying to figure this one out. But I wasn't successful. I'm a hobby dev, so not too experienced with signing of anything code-wise. So time to head to the forums for help. My SwiftUI app runs fine on the simulator. My app also runs fine when downloaded from the store. But I cannot: Build the item from Xcode to my new iPhone 15 Build and distribute an archive, so that I can release a new version of my app What I did so far: Removed and reinstalled my Pods via Terminal Removed and reinstalled my packages through Xcode Removed trusted devices from my iPhone Removed trusted devices from my Macbook Added my new iPhone to my Apple Developer account via https://developer.apple.com/account/resources/devices/list Removed my old iPhone Restarted everything at least 5 times I keep getting this error after building, but immediately upon installing: Failed to install the app on the device. Domain: com.apple.dt.CoreDeviceError Code: 3002 User Info: { DVTErrorCreationDateKey = "2023-10-16 11:47:42 +0000"; IDERunOperationFailingWorker = IDEInstallCoreDeviceWorker; NSURL = "file:///Users/jorritgernaat/Library/Developer/Xcode/DerivedData/WalkApp-fukevcszpwufbzavuluhlbvhsaaa/Build/Products/Debug-iphoneos/WalkApp.app/"; } -- Paaltjesroutes moet worden bijgewerkt Domain: IXUserPresentableErrorDomain Code: 17 Failure Reason: Deze app moet door de ontwikkelaar worden bijgewerkt om te kunnen werken met deze iOS-versie. Recovery Suggestion: Failed to verify code signature of /var/installd/Library/Caches/com.apple.mobile.installd.staging/temp.UleUN5/extracted/WalkApp.app/Frameworks/FirebaseFirestore.framework : 0xe8008029 (The code signature version is no longer supported.) -- Failed to verify code signature of /var/installd/Library/Caches/com.apple.mobile.installd.staging/temp.UleUN5/extracted/WalkApp.app/Frameworks/FirebaseFirestore.framework : 0xe8008029 (The code signature version is no longer supported.) Domain: MIInstallerErrorDomain Code: 13 User Info: { FunctionName = "+[MICodeSigningVerifier _validateSignatureAndCopyInfoForURL:withOptions:error:]"; LegacyErrorString = ApplicationVerificationFailed; LibMISErrorNumber = "-402620375"; SourceFileLine = 78; } -- Event Metadata: com.apple.dt.IDERunOperationWorkerFinished : { "device_isCoreDevice" = 1; "device_model" = "iPhone15,4"; "device_osBuild" = "17.0.3 (21A360)"; "device_platform" = "com.apple.platform.iphoneos"; "dvt_coredevice_version" = "348.1"; "dvt_mobiledevice_version" = "1643.2.4"; "launchSession_schemeCommand" = Run; "launchSession_state" = 1; "launchSession_targetArch" = arm64; "operation_duration_ms" = 1864; "operation_errorCode" = 17; "operation_errorDomain" = "com.apple.dt.CoreDeviceError.3002.IXUserPresentableErrorDomain"; "operation_errorWorker" = IDEInstallCoreDeviceWorker; "operation_name" = IDERunOperationWorkerGroup; "param_debugger_attachToExtensions" = 0; "param_debugger_attachToXPC" = 1; "param_debugger_type" = 3; "param_destination_isProxy" = 0; "param_destination_platform" = "com.apple.platform.iphoneos"; "param_diag_MainThreadChecker_stopOnIssue" = 0; "param_diag_MallocStackLogging_enableDuringAttach" = 0; "param_diag_MallocStackLogging_enableForXPC" = 1; "param_diag_allowLocationSimulation" = 1; "param_diag_checker_tpc_enable" = 1; "param_diag_gpu_frameCapture_enable" = 0; "param_diag_gpu_shaderValidation_enable" = 0; "param_diag_gpu_validation_enable" = 0; "param_diag_memoryGraphOnResourceException" = 0; "param_diag_queueDebugging_enable" = 1; "param_diag_runtimeProfile_generate" = 0; "param_diag_sanitizer_asan_enable" = 0; "param_diag_sanitizer_tsan_enable" = 0; "param_diag_sanitizer_tsan_stopOnIssue" = 0; "param_diag_sanitizer_ubsan_stopOnIssue" = 0; "param_diag_showNonLocalizedStrings" = 0; "param_diag_viewDebugging_enabled" = 1; "param_diag_viewDebugging_insertDylibOnLaunch" = 1; "param_install_style" = 0; "param_launcher_UID" = 2; "param_launcher_allowDeviceSensorReplayData" = 0; "param_launcher_kind" = 0; "param_launcher_style" = 99; "param_launcher_substyle" = 8192; "param_runnable_appExtensionHostRunMode" = 0; "param_runnable_productType" = "com.apple.product-type.application"; "param_structuredConsoleMode" = 1; "param_testing_launchedForTesting" = 0; "param_testing_suppressSimulatorApp" = 0; "param_testing_usingCLI" = 0; "sdk_canonicalName" = "iphoneos17.0"; "sdk_osVersion" = "17.0"; "sdk_variant" = iphoneos; } -- System Information macOS Version 14.0 (Build 23A344) Xcode 15.0 (22265) (Build 15A240d) Timestamp: 2023-10-16T13:47:42+02:00``` It seems to somehow involve Firebase, but that can also be because that's simply the only 3rd party stuff I use. Help me get back to writing code and shipping app updates :)

It seem that Xcode preview compiler fail correctly parse generic and produce a "Failed to build" error: Proposed example: ^^^^^^^^^^^^^^^^^^^^^^^^^^^ import CoreBluetooth import SwiftUI /// Working in preview /* struct InitialView&lt;S&gt;: View where S: StringProtocol { var body: some View { NestedView() } struct NestedView: View { var body: some View { Text("Hello") } } } struct WorkingView: View { var body: some View { InitialView&lt;String&gt;() } } */ /// Not working in preview struct NotWorking: View { var body: some View { InitialView&lt;String&gt;() } struct InitialView&lt;S&gt;: View where S: StringProtocol { var body: some View { NestedView() } struct NestedView: View { var body: some View { Text("Hello") } } } } struct ContentView_PreviewProviders: PreviewProvider { static var previews: some View { NotWorking() } } ^^^^^^^^^^^^^^^^^^^^^^^^^^^ investigating the SampleView.1.preview-thunk.swift from ~/Library/Developer/Xcode/DerivedData/.../ directory, I found that compiler translate the above code into pre-compiled stage using typealias without considering the Generic condition- ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ... extension NotWorking.InitialView.NestedView { typealias InitialView = NotWorking.InitialView typealias NestedView = NotWorking.InitialView.NestedView @_dynamicReplacement(for: body) private var __preview__body: some View { #sourceLocation(file: "/Users/giuseppe/Development/Private/Dev/MyPlayground/MyPlayground/SampleView.swift", line: 40) Text(__designTimeString("#32812.[2].[1].[1].[0].property.[0].[0].arg[0].value", fallback: "Hello")) #sourceLocation() } } extension NotWorking.InitialView { typealias InitialView = NotWorking.InitialView typealias NestedView = NotWorking.InitialView.NestedView @_dynamicReplacement(for: body) private var __preview__body: some View { #sourceLocation(file: "/Users/giuseppe/Development/Private/Dev/MyPlayground/MyPlayground/SampleView.swift", line: 35) NestedView() #sourceLocation() } } extension NotWorking { @_dynamicReplacement(for: body) private var __preview__body: some View { #sourceLocation(file: "/Users/giuseppe/Development/Private/Dev/MyPlayground/MyPlayground/SampleView.swift", line: 30) InitialView&lt;String&gt;() #sourceLocation() } } ... ^^^^^^^^^^^^^^^^^^^^^^^^^^^ Should be considered a compiler bug or I missed something in my code?