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Xcode ignoring SPM dependency resolution errors when building the client
This may be an Xcode problem not with SPM, but when I add a package into my App project, as a local package, whenever I change the dependencies of the package, even if the change to the version conflicts with the app's version constraints, the Xcode build the app just fine. I have to close and reopen the project again before the Xcode detects the change and raise an error during the build process. Why can't SPM/Xcode just detect the change while the app is opened, and raise an error instead of using whatever cache it is using? Currently, the workaround is to never edit the package in the app project (even though I should be able to), but to open the package as separate project to make edits, then reopen the app project to build the app. Another workaround I'm trying out is to add the xcodebuild -resolvePackageDependencies as a step during the build process, to force the build to cancel if theres package dependency resolution errors. But why is Xcode just ignoring resolution errors ??
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0
129
2w
Running tests on the DeviceHub not working
I am getting this error when trying to run my tests: Library not loaded: @rpath/XCTestCore.framework/XCTestCore Referenced from: <498690CD-C914-3EE9-8EC1-C3BA4EF513CA> /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/lib/libXCTestSwiftSupport.dylib Reason: tried: '/Users/<>/Library/Developer/Xcode/DerivedData/Sonnet-bqruszxvmhdevmbxdbnagkvhywae/Build/Products/Test Project-iphonesimulator/XCTestCore.framework/XCTestCore' (no such file) It is only appearing on the DeviceHub. When I run the tests in my xcode 26, with the old Simulator, they run just fine.
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0
124
3w
Does Siri AI work with app Intents that don't fit any Schemas?
In the past, for any App Intent developers provide to the AppShortcutsProvider, there needed to be explicit phrases provided to trigger the AppShortcut from Siri -- and if the user try to trigger the Shortcut using a slightly different phrase then the Siri does not work. With Siri AI, will App Intents that don't fit any schemas work without needing every phrase to be explicitly programmed?
3
2
426
3w
How to set the Locale.current to be same as the Environment locale?
I have this code As you can see, the locale of the Environment is different from the Locale given by .current. This is a problem for me because I have code that uses String(localized:) and AttributedString. I would like to be able to preview them with the locale I set in the Environment without any additional work on my part. I assumed these Apis would use the locale set by the environment but no, it uses the locale as decided by the schema used to build the preview app. The current solution I have is to manually change the App Language in the Preview's scheme to be whatever I need to correctly localize the language in Preview.
1
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201
Jun ’26
AttributedString Localization does not seem to work
I have this code struct TestAppleSuggestion: View { @Environment(\.locale) var locale: Locale var body: some View { VStack { VStack { Text("locale: \(locale.identifier)") Text(AttributedString(localized: LocalizedStringResource( "welcome", locale: locale ))) Text(AttributedString(localized: "welcome", locale: locale )) } } } } #Preview { TestAppleSuggestion().environment(\.locale, Locale(identifier: "fr-CA")) } Heres What I see in SwiftUi Previews The Localization is working for the LocalizedStringResource but not to the AttributedString. Why?
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342
Jun ’26
What is the lifecycle of onReceive subscriptions in SwiftUI views?
I'm trying to better understand how the onReceive modifier behaves in SwiftUI, specifically how its subscription lifecycle relates to view updates. Consider this example: TextField("Name", text: $name) .onReceive(Just(name)) { value in print(value) } This closure runs every time name changes. A common explanation is that SwiftUI recomputes body, which creates a new Just(name) publisher each time. However, this raises some questions for me about how onReceive actually works internally: When SwiftUI recomputes body, is the onReceive modifier recreated and resubscribed? Does SwiftUI automatically cancel the previous subscription when the view updates?
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114
Mar ’26
SwiftUI .task does not update its references on view update
I have this sample code import SwiftUI struct ContentView: View { var body: some View { ParentView() } } struct ParentView: View { @State var id = 0 var body: some View { VStack { Button { id+=1 } label: { Text("update id by 1") } TestView(id: id) } } } struct TestView: View { var sequence = DoubleGenerator() let id: Int var body: some View { VStack { Button { sequence.next() } label: { Text("print next number").background(content: { Color.green }) } Text("current id is \(id)") }.task { for await number in sequence.stream { print("next number is \(number)") } } } } final class DoubleGenerator { private var current = 1 private let continuation: AsyncStream<Int>.Continuation let stream: AsyncStream<Int> init() { var cont: AsyncStream<Int>.Continuation! self.stream = AsyncStream { cont = $0 } self.continuation = cont } func next() { guard current >= 0 else { continuation.finish() return } continuation.yield(current) current &*= 2 } } the print statement is only ever executed if I don't click on the update id by 1 button. If i click on that button, and then hit the print next number button, the print statement doesn't print in the xcode console. I'm thinking it is because the change in id triggered the view's init function to be called, resetting the sequence property and so subsequent clicks to the print next number button is triggering the new version of sequence but the task is still referring its previous version. Is this expected behaviour? Why in onChange and Button, the reference to the properties is always up to date but in .task it is not?
1
0
218
Jan ’26
WWDC21 Demystify SwiftUI question
When the guy was talking about structural identity, starting at about 8:53, he mentioned how the swiftui needs to guarantee that the two views can't swap places, and it does this by looking at the views type structure. It guarantees that the true view will always be an A, and the false view will always be a B. Not sure exactly what he means because views can't "swap places" like dogs. Why isn't just knowing that some View is shown in true, and another is shown in false, enough for its identity? e.g. The identity could be "The view on true" vs "The view on false", same as his example with "The dog on the left" vs "The dog on the right"
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0
98
Jan ’26
Can SwiftUI Views serve as delegates?
Structs are value types, and the SwiftUI gets reinitialized many times throughout its lifecycle. Whenever it gets reinitialized, would the reference that the delegator has of it still work if the View uses @State or @StateObject that hold a persistent reference to the views data? protocol MyDelegate: AnyObject { func didDoSomething() } class Delegator { weak var delegate: MyDelegate? func trigger() { delegate?.didDoSomething() } } struct ContentView: View, MyDelegate { private let delegator = Delegator() @State counter = 1 var body: some View { VStack { Text("\(counter)") Button("Trigger") { delegator.trigger() } } } func didDoSomething() { counter += 1 //would this call update the counter in the view even if the view's instance is copied over to the delegator? } }
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0
84
Dec ’25
Local Swift Package does not update in my project
in my xcode project, i created a new package by going through File > New > Package, just like they said in https://developer.apple.com/documentation/xcode/organizing-your-code-with-local-packages I have a package, but the problem is, whenever I made any changes in the package's source code, it never showed in the main project. I can import the package just fine, but the package does not show anything. no added apis, functions, nothing. Im using Xcode 26.0.1
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0
91
Nov ’25
Unable to create SwiftUI previews in Xcode 26 for iOS 15.5
I am getting this error msg when I try to run a SwiftUI Preview on an iOS 15.5 simulator: Termination Reason: Namespace DYLD, Code 1, Library missing | Library not loaded: /usr/lib/swift/libswift_StringProcessing.dylib | Referenced from: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator/libLiveExecutionResultsLogger.dylib | Reason: tried: '/Users/hfg/Library/Developer/Xcode/DerivedData/Testios15sim-aawlbfbtggzozseoekycwwpadhrc/Build/Intermediates.noindex/Previews/iphonesimulator/Testios15sim/Products/Debug-iphonesimulator/libswift_StringProcessing.dylib' (no such file), '/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 15.5.simruntime/Contents/Resources/RuntimeRoot/usr/lib/swift/libswift_StringProcessing.dylib' (no such file), '/usr/lib/swift/libswift_StringProcessing.dylib' (no such file), '/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 15.5.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libswift_StringProcessing.dylib' (no such file) FYI I tried with the Legacy Preview Execution both on and off
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1
497
Nov ’25
ActivityKit linker error
I have a ContentView in my app which includes the line of code FileUploadProgressAttributes. this struct is defined in a file included in the target FileUploadProgressExtension. and it is an ActivityAttributes. in ContentView I imported FileUploadProgressExtension, and the xcode is able to find the FileUploadProgressAttributes during prebuild. but during build, it gives me Undefined symbols for architecture arm64: "FileUploadProgressExtension.FileUploadProgressAttributes.init(filename: Swift.String) -> FileUploadProgressExtension.FileUploadProgressAttributes the workaround i found is to add the file with the FileUploadProgressAttributes to my app's target, but I'm not sure if this is the right thing to do. When Xcode created the extension for me, it added the extension target as a target dependency of my app. so obviously if i added this file to my app target it makes the extension target pointless. First time working with widgets so I'm not sure if I'm missing something.
0
0
142
May ’25
Microphone features don't work in Simulator
I have a Xcode 26.6, and when I run the simulators for iPhone, Siri does not work, Dictation does not work. I know my Mac microphone works just fine. It just seems like the simulator is not getting my voice input.
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0
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110
Activity
2w
"Failed to resolve package dependencies" during build process only treated as a warning?
Following up on my last question, I noticed that when we build, if there's a failure to resolve package dependencies, if previously package dependency resolution succeeded, then the failure is not treated as an error but only as a warning.
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0
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0
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112
Activity
2w
Xcode ignoring SPM dependency resolution errors when building the client
This may be an Xcode problem not with SPM, but when I add a package into my App project, as a local package, whenever I change the dependencies of the package, even if the change to the version conflicts with the app's version constraints, the Xcode build the app just fine. I have to close and reopen the project again before the Xcode detects the change and raise an error during the build process. Why can't SPM/Xcode just detect the change while the app is opened, and raise an error instead of using whatever cache it is using? Currently, the workaround is to never edit the package in the app project (even though I should be able to), but to open the package as separate project to make edits, then reopen the app project to build the app. Another workaround I'm trying out is to add the xcodebuild -resolvePackageDependencies as a step during the build process, to force the build to cancel if theres package dependency resolution errors. But why is Xcode just ignoring resolution errors ??
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0
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0
Views
129
Activity
2w
Running tests on the DeviceHub not working
I am getting this error when trying to run my tests: Library not loaded: @rpath/XCTestCore.framework/XCTestCore Referenced from: <498690CD-C914-3EE9-8EC1-C3BA4EF513CA> /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/lib/libXCTestSwiftSupport.dylib Reason: tried: '/Users/<>/Library/Developer/Xcode/DerivedData/Sonnet-bqruszxvmhdevmbxdbnagkvhywae/Build/Products/Test Project-iphonesimulator/XCTestCore.framework/XCTestCore' (no such file) It is only appearing on the DeviceHub. When I run the tests in my xcode 26, with the old Simulator, they run just fine.
Replies
0
Boosts
0
Views
124
Activity
3w
Does Siri AI work with app Intents that don't fit any Schemas?
In the past, for any App Intent developers provide to the AppShortcutsProvider, there needed to be explicit phrases provided to trigger the AppShortcut from Siri -- and if the user try to trigger the Shortcut using a slightly different phrase then the Siri does not work. With Siri AI, will App Intents that don't fit any schemas work without needing every phrase to be explicitly programmed?
Replies
3
Boosts
2
Views
426
Activity
3w
How to set the Locale.current to be same as the Environment locale?
I have this code As you can see, the locale of the Environment is different from the Locale given by .current. This is a problem for me because I have code that uses String(localized:) and AttributedString. I would like to be able to preview them with the locale I set in the Environment without any additional work on my part. I assumed these Apis would use the locale set by the environment but no, it uses the locale as decided by the schema used to build the preview app. The current solution I have is to manually change the App Language in the Preview's scheme to be whatever I need to correctly localize the language in Preview.
Replies
1
Boosts
0
Views
201
Activity
Jun ’26
AttributedString Localization does not seem to work
I have this code struct TestAppleSuggestion: View { @Environment(\.locale) var locale: Locale var body: some View { VStack { VStack { Text("locale: \(locale.identifier)") Text(AttributedString(localized: LocalizedStringResource( "welcome", locale: locale ))) Text(AttributedString(localized: "welcome", locale: locale )) } } } } #Preview { TestAppleSuggestion().environment(\.locale, Locale(identifier: "fr-CA")) } Heres What I see in SwiftUi Previews The Localization is working for the LocalizedStringResource but not to the AttributedString. Why?
Replies
3
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0
Views
342
Activity
Jun ’26
What is the lifecycle of onReceive subscriptions in SwiftUI views?
I'm trying to better understand how the onReceive modifier behaves in SwiftUI, specifically how its subscription lifecycle relates to view updates. Consider this example: TextField("Name", text: $name) .onReceive(Just(name)) { value in print(value) } This closure runs every time name changes. A common explanation is that SwiftUI recomputes body, which creates a new Just(name) publisher each time. However, this raises some questions for me about how onReceive actually works internally: When SwiftUI recomputes body, is the onReceive modifier recreated and resubscribed? Does SwiftUI automatically cancel the previous subscription when the view updates?
Replies
0
Boosts
0
Views
114
Activity
Mar ’26
SwiftUI .task does not update its references on view update
I have this sample code import SwiftUI struct ContentView: View { var body: some View { ParentView() } } struct ParentView: View { @State var id = 0 var body: some View { VStack { Button { id+=1 } label: { Text("update id by 1") } TestView(id: id) } } } struct TestView: View { var sequence = DoubleGenerator() let id: Int var body: some View { VStack { Button { sequence.next() } label: { Text("print next number").background(content: { Color.green }) } Text("current id is \(id)") }.task { for await number in sequence.stream { print("next number is \(number)") } } } } final class DoubleGenerator { private var current = 1 private let continuation: AsyncStream<Int>.Continuation let stream: AsyncStream<Int> init() { var cont: AsyncStream<Int>.Continuation! self.stream = AsyncStream { cont = $0 } self.continuation = cont } func next() { guard current >= 0 else { continuation.finish() return } continuation.yield(current) current &*= 2 } } the print statement is only ever executed if I don't click on the update id by 1 button. If i click on that button, and then hit the print next number button, the print statement doesn't print in the xcode console. I'm thinking it is because the change in id triggered the view's init function to be called, resetting the sequence property and so subsequent clicks to the print next number button is triggering the new version of sequence but the task is still referring its previous version. Is this expected behaviour? Why in onChange and Button, the reference to the properties is always up to date but in .task it is not?
Replies
1
Boosts
0
Views
218
Activity
Jan ’26
WWDC21 Demystify SwiftUI question
When the guy was talking about structural identity, starting at about 8:53, he mentioned how the swiftui needs to guarantee that the two views can't swap places, and it does this by looking at the views type structure. It guarantees that the true view will always be an A, and the false view will always be a B. Not sure exactly what he means because views can't "swap places" like dogs. Why isn't just knowing that some View is shown in true, and another is shown in false, enough for its identity? e.g. The identity could be "The view on true" vs "The view on false", same as his example with "The dog on the left" vs "The dog on the right"
Replies
0
Boosts
0
Views
98
Activity
Jan ’26
Can SwiftUI Views serve as delegates?
Structs are value types, and the SwiftUI gets reinitialized many times throughout its lifecycle. Whenever it gets reinitialized, would the reference that the delegator has of it still work if the View uses @State or @StateObject that hold a persistent reference to the views data? protocol MyDelegate: AnyObject { func didDoSomething() } class Delegator { weak var delegate: MyDelegate? func trigger() { delegate?.didDoSomething() } } struct ContentView: View, MyDelegate { private let delegator = Delegator() @State counter = 1 var body: some View { VStack { Text("\(counter)") Button("Trigger") { delegator.trigger() } } } func didDoSomething() { counter += 1 //would this call update the counter in the view even if the view's instance is copied over to the delegator? } }
Replies
0
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0
Views
84
Activity
Dec ’25
Local Swift Package does not update in my project
in my xcode project, i created a new package by going through File > New > Package, just like they said in https://developer.apple.com/documentation/xcode/organizing-your-code-with-local-packages I have a package, but the problem is, whenever I made any changes in the package's source code, it never showed in the main project. I can import the package just fine, but the package does not show anything. no added apis, functions, nothing. Im using Xcode 26.0.1
Replies
0
Boosts
0
Views
91
Activity
Nov ’25
Unable to create SwiftUI previews in Xcode 26 for iOS 15.5
I am getting this error msg when I try to run a SwiftUI Preview on an iOS 15.5 simulator: Termination Reason: Namespace DYLD, Code 1, Library missing | Library not loaded: /usr/lib/swift/libswift_StringProcessing.dylib | Referenced from: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator/libLiveExecutionResultsLogger.dylib | Reason: tried: '/Users/hfg/Library/Developer/Xcode/DerivedData/Testios15sim-aawlbfbtggzozseoekycwwpadhrc/Build/Intermediates.noindex/Previews/iphonesimulator/Testios15sim/Products/Debug-iphonesimulator/libswift_StringProcessing.dylib' (no such file), '/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 15.5.simruntime/Contents/Resources/RuntimeRoot/usr/lib/swift/libswift_StringProcessing.dylib' (no such file), '/usr/lib/swift/libswift_StringProcessing.dylib' (no such file), '/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 15.5.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libswift_StringProcessing.dylib' (no such file) FYI I tried with the Legacy Preview Execution both on and off
Replies
1
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1
Views
497
Activity
Nov ’25
Can iOS simulators simulate device pixel density?
Do simulators match real device for pixel density for testing image assets?
Replies
1
Boosts
0
Views
117
Activity
Jun ’25
ActivityKit linker error
I have a ContentView in my app which includes the line of code FileUploadProgressAttributes. this struct is defined in a file included in the target FileUploadProgressExtension. and it is an ActivityAttributes. in ContentView I imported FileUploadProgressExtension, and the xcode is able to find the FileUploadProgressAttributes during prebuild. but during build, it gives me Undefined symbols for architecture arm64: "FileUploadProgressExtension.FileUploadProgressAttributes.init(filename: Swift.String) -> FileUploadProgressExtension.FileUploadProgressAttributes the workaround i found is to add the file with the FileUploadProgressAttributes to my app's target, but I'm not sure if this is the right thing to do. When Xcode created the extension for me, it added the extension target as a target dependency of my app. so obviously if i added this file to my app target it makes the extension target pointless. First time working with widgets so I'm not sure if I'm missing something.
Replies
0
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0
Views
142
Activity
May ’25