I'm calling the following function in a SwiftUI View modifier in Xcode 16.1: nonisolated function f -> CGFloat { let semaphore = DispatchSemaphore(value: 0) var a: CGFloat = 0 DispatchQueue.main.async { a = ... semaphore.signal() } semaphore.wait() return a } The app freezes, and code in the main queue is never executed.

CIFormat static var such as RGBA16 give concurrency warnings: Reference to static property 'RGBA16' is not concurrency-safe because it involves shared mutable state; this is an error in Swift 6 Should all these formats be static let to suppress the warnings (future errors)?

How to save some data in SwiftData to CloudKit, and others on local device only?

Calling reloadTimelines() on WidgetCenter.shared does not reload the timeline on my Apple Watch with watchOS 10.2 beta 2. Used to work in watchOS 10.1 and before. It does not work in iOS 17.2 beta 2 either. Do others see the same problem?

For a watch app with a companion iOS app, if the user purchases a subscription in the iOS app, does the subscriptionStatusTask view modifier in the watch app get the subscription info? Is the user considered subscribed in the watch app?

I keep getting crashes with the following error in Xcode 15 beta 7: CoreData: debug: PostSaveMaintenance: fileSize 15009192 greater than prune threshold CoreData: annotation: PostSaveMaintenance: wal_checkpoint(TRUNCATE) Is 15M bytes too much data?

With the following in an iOS and watch app import Observation @Observable final class DataModel { var common = 0 #if os(iOS) var iProp = 0 #endif } Xcode 15 beta 5 reports error: Cannot find type '_iProp' in scope Is platform specific property forbidden in Observable objects?

Xcode 15 beta 5 removed the batch insert method for ModelContext, as verified in code, and indicated in the online doc, although Xcode documentation still shows it. How can we perform batch insertions?

In Xcode 15 beta 3 and iOS 17 beta 3, my app with SwiftData keeps generating error: *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSManagedObject 0x2811cb390> setValue:forUndefinedKey:]: the entity dataSets is not key value coding-compliant for the key "(null)".' I have a model: @Model final class Station: Sendable { ... var dataSets: [String] } The error seems to occur when saving entities of the model in SwiftData. There is no entity named "dataSets". Only a property in the above model. What's the null key in the error?

Checking subscription status with the new subscriptionStatusTask on iOS 17 beta 3 works well for me, but the status is empty on watchOS 10 beta 3. Seems the same problem reported elsewhere. Does anyone see this problem too?

Has anyone used healthDataAccessRequest successfully in SwiftUI? How does parameter trigger work?

My app supports English and another language. The English string catalog is empty. Running the app in English in Xcode 15 beta 3, all strings are displayed in capital letters. It seems the behavior when translations are missing. Do we need to translate each English key into the same English translation, or is it a bug?

Is there a programming example for CameraView?

I'm trying to convert s String property of a Sendable structure to LocalizedStringResource, so that Xcode extracts it into the string catalog. There is a warning since LocalizedStringResource is not Sendable currently.

Running my app with SwiftData in iOS 17 beta on iPhone leads to error: cannot open file at line 46973 of [554764a6e7] os_unix.c:46973: (2) open(/private/var/mobile/Containers/Data/Application/ED4308D5-058B-41BC-A617-A46F9754E3EC/Library/Application Support/default.store) - No such file or directory API call with unopened database connection pointer misuse at line 179760 of [554764a6e7] It seems the database file has not been created yet, since it's the first time running the app with SwiftData.