General: Forums subtopic: App & System Services > Networking TN3151 Choosing the right networking API Networking Overview document — Despite the fact that this is in the archive, this is still really useful. TLS for App Developers forums post Choosing a Network Debugging Tool documentation WWDC 2019 Session 712 Advances in Networking, Part 1 — This explains the concept of constrained networking, which is Apple’s preferred solution to questions like How do I check whether I’m on Wi-Fi? TN3135 Low-level networking on watchOS TN3179 Understanding local network privacy Adapt to changing network conditions tech talk Understanding Also-Ran Connections forums post Extra-ordinary Networking forums post Foundation networking: Forums tags: Foundation, CFNetwork URL Loading System documentation — NSURLSession, or URLSession in Swift, is the recommended API for HTTP[S] on Apple platforms. Moving to Fewer, Larger Transfers forums post Testing Background Session Code forums post Network framework: Forums tag: Network Network framework documentation — Network framework is the recommended API for TCP, UDP, and QUIC on Apple platforms. Building a custom peer-to-peer protocol sample code (aka TicTacToe) Implementing netcat with Network Framework sample code (aka nwcat) Configuring a Wi-Fi accessory to join a network sample code Moving from Multipeer Connectivity to Network Framework forums post Network Extension (including Wi-Fi on iOS): See Network Extension Resources Wi-Fi Fundamentals TN3111 iOS Wi-Fi API overview Wi-Fi Aware framework documentation Wi-Fi on macOS: Forums tag: Core WLAN Core WLAN framework documentation Wi-Fi Fundamentals Secure networking: Forums tags: Security Apple Platform Security support document Preventing Insecure Network Connections documentation — This is all about App Transport Security (ATS). Available trusted root certificates for Apple operating systems support article Requirements for trusted certificates in iOS 13 and macOS 10.15 support article About upcoming limits on trusted certificates support article Apple’s Certificate Transparency policy support article What’s new for enterprise in iOS 18 support article — This discusses new key usage requirements. Technote 2232 HTTPS Server Trust Evaluation Technote 2326 Creating Certificates for TLS Testing QA1948 HTTPS and Test Servers Miscellaneous: More network-related forums tags: 5G, QUIC, Bonjour On FTP forums post Using the Multicast Networking Additional Capability forums post Investigating Network Latency Problems forums post WirelessInsights framework documentation iOS Network Signal Strength Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com"

Hi everyone, I’ve run into a consistent issue on multiple Apple Vision Pro devices where downloads using URLSessionConfiguration.background are between 4× and 10x slower than when using URLSessionConfiguration.default. This issue is systematic and can easily be reproduced. This only happens on device, in the simulator, both configurations download files at the expected speed with respect to the network speed. Details: Tested on visionOS 26.0.1 and 26.1 (public releases) Reproduced across 2 Vision Pro (currently testing on a third one) Reproduced on 2 different Wi-fi networks (50mb/s and 880mb/s) From my tests this speed issue seems to affects multiple apps on my device: Stobo Vision (our app), Immersive India, Amplium Not server-related (reproduces with Apple CDN, S3, and DigitalOcean) I’ve built a small sample project that makes this easy to reproduce, it downloads a large file (1.1 GB video) using two managers: One with URLSessionConfiguration.default One with URLSessionConfiguration.background You can also try it with your own file url (from an s3 for example) Expected behavior: Background sessions should behave similarly to default sessions in terms of throughput, just as they do in the simulator. To be clear I am comparing both config when running in the foreground, not in the background. Actual behavior: Background sessions on Vision Pro are significantly slower, making them less usable for large file downloads. On this screenshot it's even reaching 27x slower than the expected speed. Default config takes ~97s to download and Background config takes ~2640s. I do now have the fastest internet connection but 44min to download 90.5MB is extremely slow. Has anyone else seen this behavior or found a workaround? Or is this an expected behavior from URLSessionConfiguration.background? If I'm doing something wrong please let me know Repo link: https://github.com/stobo-app/DownloadConfigTesting

After switching our iOS app project from Swift 5 to Swift 6 and publishing an update, we started seeing a large number of crashes in Firebase Crashlytics. The crashes are triggered by NotificationCenter methods (post, addObserver, removeObserver) and show the following error: BUG IN CLIENT OF LIBDISPATCH: Assertion failed: Block was expected to execute on queue [com.apple.main-thread (0x1f9dc1580)] All scopes to related calls are already explicitly marked with @MainActor. This issue never occurred with Swift 5, but appeared immediately after moving to Swift 6. Has anyone else encountered this problem? Is there a known solution or workaround? Thanks in advance!

When my Share Extension receives an image from the macOS Photos app on Tahoe, the NSItemProvider passes a URL to an image file in a temporary location. All attempts to read that file fail silently, such as with NSImage(contentsOfFile) I can see that the file does exist in Finder. This code did work in previous macOS versions. It seems like a permissions issue, but startAccessingSecurityScopedResource had no effect. Other platforms work, other apps work, such as shares from Finder, which shares via data instead of a url. I'm really stuck. Has anyone else run into this? // make sure provider has a conforming item if itemProvider.hasItemConformingToTypeIdentifier(imageType) { do { let data = try await itemProvider.loadItem(forTypeIdentifier: imageType, options: nil) // data may be image NativeImage, Data, or a URL to an image file. // figure out which by casting, then attempt to load uiImage if let image = data as? NativeImage { print("found NativeImage") self.images.append(image) } else if let data = data as? Data { print("found Data") if let image = NativeImage(data: data) { self.images.append(image) } } else if let url = data as? URL{ print("found URL") if let image = NativeImage(contentsOfFile: url.path) { print("loaded from URL") self.images.append(image) } } }catch{ print("⛔️ Share Extension Error: \(error.localizedDescription)") } }

I have an iOS app with ExtensionFoundation. It runs well on my local device, but when I upload on the AppStore it gets rejected with: Validation failed Invalid Info.plist value. The value of the EXExtensionPointIdentifier key, AsheKube.app.a-Shell.localWebServer, in the Info.plist of “a-Shell.app/Extensions/localWebServer.appex” is invalid. Please refer to the App Extension Programming Guide at https://developer.apple.com/library/content/documentation/General/Conceptual/ExtensibilityPG/Action.html#/apple_ref/doc/uid/TP40014214-CH13-SW1. (ID: ae8dd1dd-8caf-4a48-9651-7a225faed4eb) The Info.plist in my Extension is: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>EXAppExtensionAttributes</key> <dict> <key>EXExtensionPointIdentifier</key> <string>com.example.example-extension</string> </dict> </dict> </plist> so the Info.plist that causes the issue has been automatically generated by Xcode. I can access it as well, and it says: { "BuildMachineOSBuild" => "25A354" "CFBundleDevelopmentRegion" => "en" "CFBundleDisplayName" => "localWebServerExtension" "CFBundleExecutable" => "localWebServer" "CFBundleIdentifier" => "AsheKube.app.a-Shell.localWebServerExtension" "CFBundleInfoDictionaryVersion" => "6.0" "CFBundleName" => "localWebServer" "CFBundlePackageType" => "XPC!" "CFBundleShortVersionString" => "1.0" "CFBundleSupportedPlatforms" => [ 0 => "iPhoneOS" ] "CFBundleVersion" => "1" "DTCompiler" => "com.apple.compilers.llvm.clang.1_0" "DTPlatformBuild" => "23A339" "DTPlatformName" => "iphoneos" "DTPlatformVersion" => "26.0" "DTSDKBuild" => "23A339" "DTSDKName" => "iphoneos26.0" "DTXcode" => "2601" "DTXcodeBuild" => "17A400" "EXAppExtensionAttributes" => { "EXExtensionPointIdentifier" => "AsheKube.app.a-Shell.localWebServer" } "MinimumOSVersion" => "26.0" "NSHumanReadableCopyright" => "Copyright © 2025 AsheKube. All rights reserved." "UIDeviceFamily" => [ 0 => 1 1 => 2 ] "UIRequiredDeviceCapabilities" => [ 0 => "arm64" ] } What should I do to be able to upload on the AppStore?

I'm working on an API client for a REST service that uses a custom token-based authentiation scheme. The app hits a specificed authentication endpoint with a username and password, said endpoint returns a token that's good for X amount of time, and the app passes that token along with every subsequent request. When that token expires, we start over.Most literature out there tells me to manually set the Authorization header on my request, but official Apple documentation discourages this, as that header is meant to be 'owned' by the built-in HTTP loading system. That said, official documentation on the 'correct' way to do this is shockingly lacking, and the standard didReceiveChallenge callbacks seem better suited for non-custom Basic/Digest/etc authentication schemes. One thought I had was registering my own URLProtocol subclass to handle our custom flow. However, while I haven't had a chance to sit down and take a crack at that yet, my understanding from skimming these forums is that it's suffering from some bit-rot right now, so it 'might' (?) not be the best choice. That, and it's also not clear to me whether the rules around the Authorization header change when a custom URLProtocol is in play.So, community (paging eskimo in particular!), what's the correct way for me to go about this?

A user of one of my apps reported that since the update to macOS 26.1 they are no longer able to scan Macintosh HD: the app used to work, but now always reports that Macintosh HD contains a single empty file named .nofollow, or rather the path is resolved to /.nofollow. Initially I thought this could be related to resolving the file from the saved bookmark data, but even restarting the app and selecting Macintosh HD in an open panel (without resolving the bookmark data) produces the same result. The user tried another app of mine with the same issue, but said that they were able to scan Macintosh HD in other App Store apps. I never heard of this issue before and my apps have been on the App Store for many years, but it looks like I might be doing something wrong, or the APIs that I use are somehow broken. In all my apps I currently use getattrlistbulk because I need attributes that are not available as URLResourceKey in all supported operating system versions. What could be the issue? I'm on macOS 26.1 myself and never experienced it.

I regularly receive emails from my customers asking why my app, which copies files from a source folder to a destination folder, gives an error during the copy operation, usually when some kind of NAS is involved. I then ask if copying the same file works in the Finder and they usually say yes. Then it’s up to me to contact the NAS vendor and ask why their NAS doesn’t work correctly with the copyfile function which my app uses to copy files, and provide them with a sample Xcode project that reproduces the issue. It would be so much easier for me, and probably other developers as well, if my customers could test their NAS with the Finder, then if it doesn’t work, contact their NAS vendor and solve the issue, or if it works, rest assured that file copies will work for any other app that uses the same API as the Finder. I could spend my time doing much more productive and interesting work rather than checking why every other NAS doesn’t work with my app which, after all, uses the most basic file copy mechanism available on macOS. Is there any chance that in the future (hopefully sooner than later) there will be an API to copy files like the Finder with progress information, or is there a reason why this won't ever be possible? I created FB20929181.

Since macOS 26.1, creating bookmark data based on a NSOpenPanel URL, does not return the expected bookmark data when the selected source concerns a Windows NTFS fileshare. When the returned data is being resolved, the returned URL points to the local drive of the current Mac. Which is of course super confusing for the user. This issue did not occur in macOS 26.0 and older. In essence, the following code line with 'url' based on an URL from a NSOpenPanel after selecting the root of a Windows NTFS share, creates an incorrect bookmark in macOS 26.1: let bookmark = try url.bookmarkData(options: .withSecurityScope, includingResourceValuesForKeys: nil, relativeTo: nil) I have tested this on two different Macs with macOS 26.1 with two different Windows PC both hosting NTFS files shares via SMB. My questions: Have anyone else encountered this issue in macOS 26? Perhaps even with other fileshare types? Is there a workaround or some new project configuration needed in Xcode to get this working?

Hi, We can easily get drive throughput using the iostat command, but it only outputs plain text that needs to be parsed, and I’m not sure if the format or column order is consistent across macOS versions. Is there any API that provides the same disk I/O metrics that iostat reports, but in a way that can be safely called from a notarized app?

Hello, I have a question about data deserialization using NSKeyedUnarchiver in iOS SDK development. Current Situation: Previously, we were using the NSKeyedUnarchiver.unarchiveObject(with: Data) function We have changed to using the NSKeyedUnarchiver.unarchivedObject(ofClasses:from:) method to deserialize complex objects stored in UserDefaults We need to include all types in the ofClasses parameter, including Swift primitive types as well as various custom classes and structs within the project Questions: Implementation Approach: Is it correct pattern to include all classes defined in the project in the ofClasses array? Is this approach recommended? Runtime Stability: When using this approach, is there a possibility of runtime crashes? Are there any performance issues? Alternative Methods: If the current approach is not the correct pattern, what alternatives should we consider? Current Code Structure: All model classes conform to the NSSecureCoding protocol We use the requiringSecureCoding: true parameter We use a whitelist approach, explicitly listing only allowed classes I would like to know if this structure is appropriate, or if we should consider a different approach. Thank you.

On iOS 18 and lower version, my application supports automatically switching to [System settings - Personal Hotspot] directly. But on iOS 26, my application will be redirected to [System settings- Apps]. Does iOS 26 disable the behavior of directly jumping to the system hotspot page? If support, could you share the API for iOS 26?

If I'm reading this guide correctly, macOS will automatically/implicitly startAccessingSecurityScopedResource for files opened via drag to Dock icon or NSOpenPanel. And I'm expected to call stopAccessingSecurityScopedResource to balance it once I'm done. Does that mean that if I don't, I'm leaking kernel resources as per the docs? If you fail to relinquish your access to file-system resources when you no longer need them, your app leaks kernel resources. If sufficient kernel resources leak, your app loses its ability to add file-system locations to its sandbox, such as with Powerbox or security-scoped bookmarks, until relaunched. What is this limit in practice for macOS and iOS? I've seen number ranging from 1000-2500. From my testing, iOS does not provide the same implicit startAccessingSecurityScopedResource when using UIDocumentPickerViewController. Is this a correct observation/per design? Now, in the cases where I'm creating an NSURL by resolving a saved bookmark, I'm expected to explicitly startAccessingSecurityScopedResource. Based on this, from what I can tell, this means that I can't universally call startAccessingSecurityScopedResource whenever I access a resource by URL, balanced with a stopAccessingSecurityScopedResource when done, as depending on how I got the URL it might already be implicitly started. Is this a correct observation? Do I need to explicitly check whether I'm on iOS (never implicit?), or macOS (sometimes implicit?), and selectively startAccessingSecurityScopedResource based on every call site that may give me a security-scoped file? If so, is there a complete list of the entrypoints that may give me such files (file dialog, drag and drop, etc)? Thanks!

Hello, is it allowed to use Foundation Model Framework in submission app for WWDC26? The thing is that Apple Intelligence needs to be enabled in the settings. So, does that mean the jury won't be able to fully utilize the app's AI functionality?

Hi, I have a macOS app distributed through the App Store that uses an app group to share data with app extensions. The group identifier has the form: .group. In Xcode 26 I am now asked to convert the project to profile based app groups (like on iOS). My question is: Can I convert the project to profile based app groups and will the existing app group (which is prefixed with the Team ID) continue to work (and will exiting users still be able to access their data). If yes, should I add the app group with or without the Team ID prefix to the profile.

Hi, I've tried adding Extensions (using ExtensionFoundation) to one of my iOS apps. They work using Xcode on my devices, but when I upload them to the AppStore, I get the following error: ITMS-90349: Invalid Info.plist value - The value of the EXExtensionPointIdentifier key, AsheKube.app.a-Shell.localWebServer, in the Info.plist of “a-Shell.app/Extensions/localWebServer.appex” is invalid. Please refer to the App Extension Programming Guide at https://developer.apple.com/library/content/documentation/General/Conceptual/ExtensibilityPG/Action.html#/apple_ref/doc/uid/TP40014214-CH13-SW1. I could not find relevant information on the web page pointed. I've tried different values for the "EXExtensionPointIdentifier", but none of them work. This value was generated by Xcode, since I did set the user-defined build setting EX_ENABLE_EXTENSION_POINT_GENERATION = YES, as explained in the instructions. At this point, I have no idea how to fix this issue.

Hi, I'm trying to add an extension to my app on iOS 26. I've followed the instructions on https://developer.apple.com/documentation/extensionfoundation/adding-support-for-app-extensions-to-your-app and made it as far as being able to launch the extension: let monitor = try await AppExtensionPoint.Monitor(appExtensionPoint: .localWebServerExtension) currentIdentity = monitor.identities.first if let currentIdentity = currentIdentity { let myConfig = AppExtensionProcess.Configuration(appExtensionIdentity: currentIdentity, onInterruption: { NSLog("extension was terminated") }) myProcess = try await AppExtensionProcess(configuration: myConfig) myConnection = try myProcess?.makeXPCConnection() } None of these calls throw, and when I examine myProcess from inside that code, it seems to be normal (there's a pid, for example). Yet the code inside my extension seems to not be executed: breakpoints are not triggered, NSLog() calls do not appear on the console. The onInterruption() callback is also not triggered, or at least it does not appear on the console either. I've probably missed something obvious, but what could it be?

I am working with the rich TextEditor introduced in iOS 26, but I am having trouble preserving AttributedString formatting when converting to/from RTF. Here is my exporting logic in my view model (AttributedString to RTF) let nsAttrStr = NSAttributedString(self.text) // text is an AttributedString (bound to the TextEditor input) let range = NSRange(location: 0, length: nsAttrStr.length) let options: [NSAttributedString.DocumentAttributeKey: Any] = [ .documentType: NSAttributedString.DocumentType.rtf ] guard let data = try? nsAttrStr.data(from: range, documentAttributes: options) else { return nil } let rtfBase64 = data.base64EncodedString() When I inspect the result, it seems to lose the font, size, boldness, etc which is being correctly rendered in the TextEditor. When I convert back from RTF to an AttributedString, it reverts to the default text formatting applied in the TextEditor. Any ideas what could be going wrong?

I'm working in Xcode for the first time in over a decade (coming from VS Code and Zed), so bear with me on this one. I've just started up a new project and got things running, and I'm adding the following struct to my project: struct HttpRequest: Codable { let body: String? let headers: [String: String] let id: UUID let method: HttpMethod let url: String } The UUID type is from Foundation, of course. However, when I hit Ctrl+Space to auto-complete it, it says "Foundation is not imported." If I hit enter to select that entry, it does not auto-import Foundation, and gives me an error that it "Cannot find type 'UUID' in scope". I can click that error and it then click "import Foundation" to add the import, but this seems like a lot of effort just to "automatically" add an import that Xcode is already aware I need to add. On the other hand, I found a number of threads online during my search for answers that suggested I shouldn't even need this import, despite Xcode's insistence. TL;DR, my questions are: 1) Do I need the Foundation import to use UUID in Swift? and 2) If I do need it, how can I auto-import the Foundation module when I auto-complete the UUID type?

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