Hey, I wanted to create a Mac-OS application. Normally I only code iPhone apps. But as soon as I want to display anything on the preview, it loads, just as normal, and then the throbber/progress indicator disappears and the preview canvas stays gray like it used to be before. I also don't get any error messages. Only one time after trying different things I got one message saying: "Could not launch Preview Shell." and "Could not create FBSOpenApplicationService." I also searched for a few solutions and tried some but none of them seemed to work. In the DiagnosticReports were some files of the time but I didn't seem to find anything helpful in there and they don't appear when I reopen my project or switch from PreviewMode "My Mac" to "iPhone 16 Pro". When I launch the app on a simulator it works perfectly fine but this is quite annoying. Thanks for trying to help me!

Hello, I am currently encountering an issue where SwiftUI View Previews cannot be displayed when the View is defined in a Static Framework target. This issue only occurs under specific conditions. Environment Xcode: 16.2 Scheme Structure: MainApp Test Target: TestHogeFeature Test Setting: Gather coverage (Code coverage collection) enabled(all) Target Structure: MainApp (Application target) Dependencies: [HogeFeature, Core] HogeFeature (Static Framework target) Dependencies: [Core] Core (Framework target) Dependencies: None TestHogeFeature (Unit test target) Dependencies: [HogeFeature] Summary I am currently working on a SwiftUI-based project and have encountered an issue where Previews fail to display under specific conditions. Below are the details: Issue In the MainApp scheme, when the code coverage collection setting (Gather coverage for) is enabled, Previews for SwiftUI Views within the HogeFeature (Static Framework) target fail to display correctly. However, the issue is resolved by taking one of the following actions: Change HogeFeature from a Static Framework to a Dynamic Framework. Remove the build setting MACH_O_TYPE: staticlib Disable the Gather coverage setting in the MainApp scheme. I have attached the actual error log from the failed Preview. preview error log Questions Why does this issue occur only when using a Static Framework with code coverage enabled? Is there any way to resolve this issue while maintaining the current configuration (Static Framework with code coverage enabled)? I would appreciate any advice or insights regarding the cause and potential solutions.

Hi everyone, I'm new to Xcode and iOS development. I've encountered an issue where asynchronous tasks seem to not execute in Xcode Canvas, but they work fine in the simulator. Can anyone explain why this might be happening or what I could do to fix it? Thank you for your help! struct PartnerProfileView: View { @State private var showSheet: Bool = true let partnerName: String var body: some View { ZStack(alignment: .bottom) { Color("EFEFF4_0F2534") ScrollView(showsIndicators: false) { headerSection() infoSection() .padding(.bottom, 5) sectionTitle("Other Skills") skillsGrid() sectionTitle("···") dynamicsSection() } .frame(maxWidth: .infinity, maxHeight: .infinity) CustomTabBar() } .navigationBarHidden(true) .ignoresSafeArea(edges: .all) .onAppear { print("PartnerProfileView received") Task { await BottomCustomPopup().present() } } .onChange(of: showSheet) { oldState, newValue in print("oldState \(oldState)") print("newValue \(newValue)") } } } //@MainActor struct BottomCustomPopup: BottomPopup { var body: some View { HStack(spacing: 0) { Text("Hello World") Spacer() Button(action: { Task { await dismissLastPopup() }}) { Text("Dismiss") } } .padding(.vertical, 20) .padding(.leading, 24) .padding(.trailing, 16) } }

I have a dummy project that is set up in the following way: one Xcode project two frameworks, UI and Feature, Feature embeds UI-framework three app targets, two that are SwiftUI lifecycle and one UIKit lifecycle all app targets import the Feature framework all app targets have same setup for asset catalogue The point of this setup is to be able to switch between app target scheme and see preview changes accordingly. That works 100% with anything coming from the asset catalogue and even localization catalogues. The dummy project exists as a proof of concept for the main project (8 years old, all Swift) I am working on. However, the same setup does not work in the main project. I am suspecting it has to do with how the project is initialised and bundles. I print out the bundles to see which bundles are registered. Dummy project will print out the bundle based on app target, the main bundle being based on the selected scheme. The main project will have the previews.com.apple.PreviewAgent.iOS as main bundle.

I am not able to use SwiftUI Preview Here is the report I get while trying to see the issue: Here is the report of the issue: And here is the call and code preview: import SwiftUI struct ContentView: View { var body: some View { VStack { Image(systemName: "globe") .imageScale(.large) .foregroundStyle(.tint) Text("Hello, world!") } .padding() } } #Preview { ContentView() } Please update.

Hi, I want to run the live preview on my iPhone, but I received the error message that the app failed to launch. How can I fix this? Everything is made with SwiftUI Thanks

class ViewModel : NSObject, ObservableObject, ASWebAuthenticationPresentationContextProviding { private var authSession: ASWebAuthenticationSession? func signInWithOpenID(provider: OAuthProvider) { let url = getOIDCAuthenticationURL(provider: provider) authSession?.cancel() authSession = nil authSession = ASWebAuthenticationSession(url: url, callbackURLScheme: "com.ninjanutri") { callbackURL, error in if let error = error { print("Error: \(error.localizedDescription)") return } guard let callbackURL = callbackURL else { return } guard let idToken = callbackURL.valueOf("id_token") else { return } self.signInWithIdToken(provider: provider, idToken: idToken) } authSession?.prefersEphemeralWebBrowserSession = false authSession?.presentationContextProvider = self authSession?.start() } public func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor { return ASPresentationAnchor() } } struct ContentView: View { @StateObject private var viewModel = ViewModel() var body: some View { Button { viewModel.signInWithOpenID(provider: .github) } label: { Text("Test") } } } when the prefersEphemeralWebBrowserSession is false, the alert and webview is totally working fine in Simulator and Real device, but not XCode Preview. Is this behaviour expected or it's a bug?

I recieve the error message "XOJITError: Could not create code file directory for session: Permission denied". I'm Using Xcode 16.2. It is an AppKit project using SwiftUI and it also happens if I create a clean project. Error log is attached. previews_diagnostics_summary.txt

Hello everyone, I've encountered an issue with SwiftUI Preview and would appreciate your help. Problem Description In a mixed Objective-C and Swift project, I'm experiencing the following situation with SwiftUI Preview: Crashes when previewing on a physical device The same code runs normally when launched directly through Xcode Project uses CocoaPods for dependency management with static frameworks Project Environment: Project Type: Mixed (Objective-C + Swift) Dependency Management: CocoaPods Dependency Type: Static frameworks Device: Physical device preview Steps to Reproduce: Write Preview code in SwiftUI file Select physical device as Preview device Click Preview button Application crashes

When working on my Xcode project and using Previews from time to time I find preview crashes and ens up with the image below. The UI is completely unresponsive and only way to bring it back I find is close and relaunch Xcode. Anyone else experience this - is there a known fix or a better way to "kick" preview to restart that doesn't involve full relaunch of XCode

Hi there, i just want to know, why my xcode is not showing any print in my Xcode, when i build it, it tell me "Ready to continue xx" but the result of my code doesnt appear in right panel

My preview crashed because it could not access my font resources. I am working on a Framework, and it seems that for frameworks, the resources are not copied into the app package of the preview. Investigation: I verified this by examining the contents of the preview: /Users/YOUR_NAME/Library/Developer/Xcode/UserData/Previews/Simulator Devices/DEVICE_UUID/data/Containers/Bundle/Application/APPLICATION_UUID/APPLICATION_NAME.app Make sure to replace "YOUR_NAME," "DEVICE_UUID," "APPLICATION_UUID," and "APPLICATION_NAME" with the actual names or UUIDs relevant to your specific situation. Now right-click on the app and select Show Package Contents. For previews that work correctly, the name of the associated app is used, and you will see all the resources in the package. However, my framework was not using the framework name. Instead, it was named XCPreviewAgent.app and did not contain any resources from my framework. Fix: As of November 2024 (Xcode 16.0 and Xcode 16.1), the fix is to use Legacy Preview Execution. In the menu, select Editor > Canvas > Legacy Preview Execution. Please leave a comment if this is fixed in a newer Xcode version.

I got a preview crash info as this: *** crashed due to fatalError in PersistentModel.swift at line 559. This KeyPath does not appear to relate RecordInfo to anything - \RecordInfo.<computed 0x00000001921dfb4e (Array<SomeInfo>)> If I change preview device to iPhoneSE, It is no crash. I think the reason is I have some dirty data in iPhone16 Pro preview device. If I'm right and how to delete it? Model of RecordInfo like this: @Model class RecordInfo { @Relationship(deleteRule: .cascade) var someInfo:[SomeInfo] } @Model class SomeInfo { var date: Date var info: String }

Views can be viewed on the canvas in XCode via the code below. #Preview { ContentView() } But how do I preview an App class in XCode? Background: I'd like to preview various settings done in the Scene of the App.

I'm trying to create a preview for my live activities when it's stale, so I created a preview provider. I followed some examples, but XCode says I'm missing preview context. Am I doing something wrong? I tried adding .previewContext(WidgetPreviewContext(family: .systemSmall)) but that doesn't seem to work.

I can't seem to access preview for any of my views in any of my swift projects at all (using Mac to code and using iPhone 16 pro as preview and simulation, simulation can work), even after restarting Mac and Xcode itself. The preview section has a popup saying "Cannot preview in this file, unexpected error occured" (for every file), please tell me what is wrong and help me solve it to see the preview, thank you! details

Hello, I recently decided to start learning how to code for iOS. I don't have much coding experience but I still wanted to explore it for fun at least. I downloaded Xcode on my Macbook, and opened a new iOS file after downloading iOS 18.1 so I could run the simulator/get a preview of my code. Even though I only had the basic "Hello World!" that is auto-generated in my code, the preview would never show and sat at a loading screen for multiple hours, saying "Preparing (Automatic) iPhone Simulator" at the top. There is probably a simple solution that I'm missing. I would appreciate any tips! Thanks.

The simulator will not work. No matter How much I restart, when I open my app, it tells me either Build succeeded but I see a loading bar or a loading automatic phone simulator but it never shows up like the line would. keep going in a loop, for example this is what it looks like,

Hello everyone, I’m currently developing my first VisionOS app in Xcode, starting with the default "Hello World" code provided when creating a new VisionOS Mixed Reality App. However, I’m facing some issues with performance and previewing that I can’t seem to resolve. When I load the preview, it takes an extremely long time, and sometimes it doesn’t load at all. Even when I try to run the app in the VisionOS Simulator, the simulator shows an endless black screen and never displays the intended view. I’ve made no changes to the code, so it’s purely the base setup. Here are my system details: Xcode version: 16.1, VisionOs 2.0; macOS version: 15.0.1; Hardware: MacBook Air 2020 M1 I’ve tried restarting Xcode and my machine, but the issue persists. Has anyone else faced similar problems or have any suggestions for fixing this? Or is my hardware simply too weak? Any help would be greatly appreciated! Thank you in advance!

I'm developing an app which supports for connect with an BLE device. There are some views for showing data from bluetooth. The code below for an example: @EnvironmentObject var bleManager: BLEManager // a class implemented CBCentralManagerDelegate var body: some View { // bleConnected is a CBPeripheral if let bleConnected = bleManager.bleConnected { if let services = bleConnected.services { ForEach(services, id:\.self) { service in // UI for print uuid, descriptions ... showServiceDescriptionView(services) if let characteristics = service.characteristics { ForEach(characteristics, id:\.self) { characteristic in // UI for print uuid, data for each characteristic showCharacteristicsDetailView(characteristic) } } } } } } } But it seems that Xcode Preview do not support connect to a real bluetooth device. So the preview window in Xcode will always be a empty view. I only can see the data on the real device. But it's important for me to design UI on the preview. So are there any method to mock a fake CBPeripheral in the Previewer? Or are there any other way to achieve this?