Xcode SwiftUI 预览崩溃，模拟器和设备工作正常
Xcode SwiftUI Preview Crashes, Simulator and Device Works Fine
在我的 SwiftUI 应用程序开发过程中的某个时刻，canvas 预览停止加载。该应用程序使用 CoreData，崩溃日志表明持久性功能存在问题。该应用程序继续在设备上和使用模拟器时按预期工作。
预览中崩溃日志的顶部：
Path: /Users/USER/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Bundle/Application/0011D911-75A5-4D79-AFA2-34BA2CB9E805/Training.app/Training
Identifier: Training
Version: 1.5 (11)
Code Type: X86-64 (Native)
Parent Process: launchd_sim [80779]
Responsible: SimulatorTrampoline [984]
User ID: 501
Date/Time: 2021-08-17 16:55:41.451 +0100
OS Version: macOS 11.5 (20G71)
Report Version: 12
Bridge OS Version: 3.0 (14Y908)
Anonymous UUID: A9FE029F-99BA-7511-2780-E515C2BA21E9
Sleep/Wake UUID: EA1649DE-D2A1-438F-8B86-9C8D63032F7F
Time Awake Since Boot: 160000 seconds
Time Since Wake: 11000 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: exc handler [81046]
Application Specific Information:
Training/Persistence.swift:17: Fatal error: Unresolved error Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={sourceURL=file:///Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator%20Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application%20Support/Training.sqlite, reason=Cannot migrate store in-place: I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS', destinationURL=file:///Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator%20Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application%20Support/Training.sqlite, NSUnderlyingError=0x6000016b1200 {Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={NSSQLiteErrorDomain=1, NSFilePath=/Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite, NSUnderlyingException=I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS', reason=I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS'}}}, ["reason": Cannot migrate store in-place: I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS', "NSUnderlyingError": Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={NSSQLiteErrorDomain=1, NSFilePath=/Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite, NSUnderlyingException=I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS', reason=I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS'}, "sourceURL": file:///Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator%20Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application%20Support/Training.sqlite, "destinationURL": file:///Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator%20Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application%20Support/Training.sqlite]
CoreSimulator 757.5 - Device: iPhone 12 Pro (836D94C3-1BF9-40BD-88EA-85DDF55F71E0) - Runtime: iOS 14.5 (18E182) - DeviceType: iPhone 12 Pro
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libswiftCore.dylib 0x00007fff2f07cd1e _assertionFailure(_:_:file:line:flags:) + 1742
1 co.uk.LiamDay.Training 0x0000000105d3266a closure #1 in PersistenceController.init(inMemory:) + 890 (Persistence.swift:17)
2 co.uk.LiamDay.Training 0x0000000105d326fb thunk for @escaping @callee_guaranteed (@guaranteed NSPersistentStoreDescription, @guaranteed Error?) -> () + 139
3 CoreData 0x00007fff251a7838 -[NSPersistentStoreCoordinator _doAddPersistentStoreWithDescription:privateCopy:completeOnMainThread:withHandler:] + 978
4 CoreData 0x00007fff251a7c3a -[NSPersistentStoreCoordinator addPersistentStoreWithDescription:completionHandler:] + 236
5 CoreData 0x00007fff2514b01b -[NSPersistentContainer _loadStoreDescriptions:withCompletionHandler:] + 272
6 CoreData 0x00007fff2514aee4 -[NSPersistentContainer loadPersistentStoresWithCompletionHandler:] + 398
7 co.uk.LiamDay.Training 0x0000000105d32144 PersistenceController.init(inMemory:) + 1060 (Persistence.swift:15)
8 co.uk.LiamDay.Training 0x0000000105d31d01 one-time initialization function for shared + 17 (Persistence.swift:6)
9 libdispatch.dylib 0x00007fff201078df _dispatch_client_callout + 8
10 libdispatch.dylib 0x00007fff20108b16 _dispatch_once_callout + 20
11 libswiftCore.dylib 0x00007fff2f3a059a swift_once + 26
12 co.uk.LiamDay.Training 0x0000000105d32234 PersistenceController.shared.unsafeMutableAddressor + 52 (Persistence.swift:6)
13 co.uk.LiamDay.Training 0x0000000105e73ba0 TrainingApp.init() + 80 (TrainingApp.swift:12)
14 co.uk.LiamDay.Training 0x0000000105e73ce1 protocol witness for App.init() in conformance TrainingApp + 17
15 com.apple.SwiftUI 0x00007fff562e5376 static App.main() + 47
16 co.uk.LiamDay.Training 0x0000000105e73c6e static TrainingApp.$main() + 78 (TrainingApp.swift:10)
17 co.uk.LiamDay.Training 0x0000000105e73d04 main + 20
18 libdyld.dylib 0x00007fff2025abbd start + 1
Thread 1:
0 libsystem_pthread.dylib 0x00007fff6033f420 start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x00007fff6033f420 start_wqthread + 0
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000200000003 rbx: 0x0000000106005a90 rcx: 0xfffffffe00000000 rdx: 0x0000000000000003
rdi: 0x00007fe683033208 rsi: 0x0000000000000103 rbp: 0x00007ffee9ed0430 rsp: 0x00007ffee9ed0390
r8: 0x0000000106868a00 r9: 0x00000001068603e0 r10: 0x0000000000000040 r11: 0x000000000000003b
r12: 0x0000000000000f30 r13: 0x00007ffee9ed0350 r14: 0x000000000000000b r15: 0x00007ffee9ed0390
rip: 0x00007fff2f07cd1e rfl: 0x0000000000010246 cr2: 0x00007fff2067e4ee
Logical CPU: 1
Error Code: 0x00000000
Trap Number: 6
Thread 0 instruction stream:
fe fe fe fe fe fe 00 b9-20 00 00 00 45 85 c0 74 ........ ...E..t
07 41 0f bd c8 83 f1 1f-c1 e9 03 be 04 00 00 00 .A..............
48 29 ce 8d 0c f5 00 00-00 00 48 c7 c2 ff ff ff H)........H.....
ff 48 d3 e2 48 f7 d2 44-89 c1 48 01 c1 48 21 d1 .H..H..D..H..H!.
48 89 4d b8 48 8d 15 77-15 00 00 48 8d 7d b8 e8 H.M.H..w...H.}..
1e 35 2d 00 4c 89 fc 48-8b 7d d0 e8 12 df 32 00 .5-.L..H.}....2.
[0f]0b 55 48 89 e5 31 c0-5d c3 0f 1f 84 00 00 00 ..UH..1.]....... <==
00 00 55 48 89 e5 41 57-41 56 41 55 41 54 53 50 ..UH..AWAVAUATSP
4d 89 cc 45 89 c6 49 89-cf 48 89 d3 49 89 f5 ff M..E..I..H..I...
d7 49 89 d0 48 8d 3d bb-14 38 00 be 0b 00 00 00 .I..H.=..8......
ba 02 00 00 00 48 89 c1-49 89 d9 6a 00 41 54 41 .....H..I..j.ATA
56 41 57 e8 da f8 ff ff-48 83 c4 20 0f 0b 0f 1f VAW.....H.. ....
Thread 0 last branch register state not available.
这是我的 Persistence.swift 文件：
import CloudKit
struct PersistenceController {
//MARK: - 1. PERSISTENCE CONTROLLER
static let shared = PersistenceController()
//MARK: - 2. PERSISTENT CONTAINER
let container: NSPersistentContainer
//MARK: - 3. INIT (load the persistent store)
init(inMemory: Bool = false) {
container = NSPersistentContainer(name: "Training")
if inMemory {
container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
}
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
}
//MARK: - 4. PREVIEW
static var preview: PersistenceController = {
let result = PersistenceController(inMemory: true)
let viewContext = result.container.viewContext
let plannedExercise1 = PlannedWorkouts(context: viewContext)
plannedExercise1.dateCreated = Date()
plannedExercise1.dateOfWorkout = Date()
plannedExercise1.duration = 3600.00
plannedExercise1.totalDistanceUnit = "meters"
plannedExercise1.totalDistanceDoubleValue = 5000.0
plannedExercise1.totalEnergyBurnedUnit = "KCal"
plannedExercise1.totalEnergyBurnedDoubleValue = 500.0
plannedExercise1.workoutActivityType = 32
plannedExercise1.id = UUID()
let plannedExercise2 = PlannedWorkouts(context: viewContext)
plannedExercise2.dateCreated = K.init().EndOfWeek(weeksSinceAnchorDate: 1)
plannedExercise2.dateOfWorkout = Date()
plannedExercise2.duration = 3600.00
plannedExercise2.totalDistanceUnit = "meters"
plannedExercise2.totalDistanceDoubleValue = 5000.0
plannedExercise2.totalEnergyBurnedUnit = "KCal"
plannedExercise2.totalEnergyBurnedDoubleValue = 500.0
plannedExercise2.workoutActivityType = 35
plannedExercise2.id = UUID()
let newStatisticChartView = ChartView(context: viewContext)
newStatisticChartView.id = UUID()
newStatisticChartView.chartViewRawValue = "dailyTrainingImpactChartView"
let newGoalView = GoalViews(context: viewContext)
newGoalView.startDate = K.init().EndOfWeek(weeksSinceAnchorDate: 1)
newGoalView.endDate = K.init().EndOfWeek(weeksSinceAnchorDate: 2)
newGoalView.id = UUID()
newGoalView.totalDistanceUnit = "meters"
newGoalView.totalDistanceDoubleValue = 30000
newGoalView.workoutActivityType = Int16(32)
let newProgram = Programs(context: viewContext)
let newProgrammedWorkout = ProgrammedWorkouts(context: viewContext)
let newPlannedProgram = PlannedPrograms(context: viewContext)
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
return result
}()
}
我已经重新启动Xcode并清除了派生数据。接下来我应该尝试什么？或者这是 SwiftUI 预览器对复杂应用程序构建的限制？
您问题的答案在调试输出的长字符串中。简单来说就是更新持久化容器框架自动创建的数据库Training.sqlite有问题
尝试手动删除这些文件夹/文件。您可以在错误消息中找到完整路径。
此外，正如其他发帖人所指出的，建议在构建预览数据库时使用 PersistentController.preview。然后它将始终在内存中从头开始创建。
您在预览中使用的是 PersistenceController.preview 还是 PersistenceController.shared？总是在你的预览中使用 .preview，因为它避免了将数据库保存到磁盘——根据你的错误，它看起来像是在尝试保存到磁盘，这会有点工作，但你会 运行错误。还要确保您的视图没有调用 PersistenceController.shared 而是传递上下文或使用环境变量。
在我的 SwiftUI 应用程序开发过程中的某个时刻，canvas 预览停止加载。该应用程序使用 CoreData，崩溃日志表明持久性功能存在问题。该应用程序继续在设备上和使用模拟器时按预期工作。
预览中崩溃日志的顶部：
Path: /Users/USER/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Bundle/Application/0011D911-75A5-4D79-AFA2-34BA2CB9E805/Training.app/Training
Identifier: Training
Version: 1.5 (11)
Code Type: X86-64 (Native)
Parent Process: launchd_sim [80779]
Responsible: SimulatorTrampoline [984]
User ID: 501
Date/Time: 2021-08-17 16:55:41.451 +0100
OS Version: macOS 11.5 (20G71)
Report Version: 12
Bridge OS Version: 3.0 (14Y908)
Anonymous UUID: A9FE029F-99BA-7511-2780-E515C2BA21E9
Sleep/Wake UUID: EA1649DE-D2A1-438F-8B86-9C8D63032F7F
Time Awake Since Boot: 160000 seconds
Time Since Wake: 11000 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: exc handler [81046]
Application Specific Information:
Training/Persistence.swift:17: Fatal error: Unresolved error Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={sourceURL=file:///Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator%20Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application%20Support/Training.sqlite, reason=Cannot migrate store in-place: I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS', destinationURL=file:///Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator%20Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application%20Support/Training.sqlite, NSUnderlyingError=0x6000016b1200 {Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={NSSQLiteErrorDomain=1, NSFilePath=/Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite, NSUnderlyingException=I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS', reason=I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS'}}}, ["reason": Cannot migrate store in-place: I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS', "NSUnderlyingError": Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={NSSQLiteErrorDomain=1, NSFilePath=/Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite, NSUnderlyingException=I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS', reason=I/O error for database at /Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application Support/Training.sqlite. SQLite error code:1, 'no such table: ZPROGRAMS'}, "sourceURL": file:///Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator%20Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application%20Support/Training.sqlite, "destinationURL": file:///Users/liamday/Library/Developer/Xcode/UserData/Previews/Simulator%20Devices/836D94C3-1BF9-40BD-88EA-85DDF55F71E0/data/Containers/Data/Application/723C3942-DBEE-4A0E-BBBE-5F3B7F5F01A1/Library/Application%20Support/Training.sqlite]
CoreSimulator 757.5 - Device: iPhone 12 Pro (836D94C3-1BF9-40BD-88EA-85DDF55F71E0) - Runtime: iOS 14.5 (18E182) - DeviceType: iPhone 12 Pro
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libswiftCore.dylib 0x00007fff2f07cd1e _assertionFailure(_:_:file:line:flags:) + 1742
1 co.uk.LiamDay.Training 0x0000000105d3266a closure #1 in PersistenceController.init(inMemory:) + 890 (Persistence.swift:17)
2 co.uk.LiamDay.Training 0x0000000105d326fb thunk for @escaping @callee_guaranteed (@guaranteed NSPersistentStoreDescription, @guaranteed Error?) -> () + 139
3 CoreData 0x00007fff251a7838 -[NSPersistentStoreCoordinator _doAddPersistentStoreWithDescription:privateCopy:completeOnMainThread:withHandler:] + 978
4 CoreData 0x00007fff251a7c3a -[NSPersistentStoreCoordinator addPersistentStoreWithDescription:completionHandler:] + 236
5 CoreData 0x00007fff2514b01b -[NSPersistentContainer _loadStoreDescriptions:withCompletionHandler:] + 272
6 CoreData 0x00007fff2514aee4 -[NSPersistentContainer loadPersistentStoresWithCompletionHandler:] + 398
7 co.uk.LiamDay.Training 0x0000000105d32144 PersistenceController.init(inMemory:) + 1060 (Persistence.swift:15)
8 co.uk.LiamDay.Training 0x0000000105d31d01 one-time initialization function for shared + 17 (Persistence.swift:6)
9 libdispatch.dylib 0x00007fff201078df _dispatch_client_callout + 8
10 libdispatch.dylib 0x00007fff20108b16 _dispatch_once_callout + 20
11 libswiftCore.dylib 0x00007fff2f3a059a swift_once + 26
12 co.uk.LiamDay.Training 0x0000000105d32234 PersistenceController.shared.unsafeMutableAddressor + 52 (Persistence.swift:6)
13 co.uk.LiamDay.Training 0x0000000105e73ba0 TrainingApp.init() + 80 (TrainingApp.swift:12)
14 co.uk.LiamDay.Training 0x0000000105e73ce1 protocol witness for App.init() in conformance TrainingApp + 17
15 com.apple.SwiftUI 0x00007fff562e5376 static App.main() + 47
16 co.uk.LiamDay.Training 0x0000000105e73c6e static TrainingApp.$main() + 78 (TrainingApp.swift:10)
17 co.uk.LiamDay.Training 0x0000000105e73d04 main + 20
18 libdyld.dylib 0x00007fff2025abbd start + 1
Thread 1:
0 libsystem_pthread.dylib 0x00007fff6033f420 start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x00007fff6033f420 start_wqthread + 0
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000200000003 rbx: 0x0000000106005a90 rcx: 0xfffffffe00000000 rdx: 0x0000000000000003
rdi: 0x00007fe683033208 rsi: 0x0000000000000103 rbp: 0x00007ffee9ed0430 rsp: 0x00007ffee9ed0390
r8: 0x0000000106868a00 r9: 0x00000001068603e0 r10: 0x0000000000000040 r11: 0x000000000000003b
r12: 0x0000000000000f30 r13: 0x00007ffee9ed0350 r14: 0x000000000000000b r15: 0x00007ffee9ed0390
rip: 0x00007fff2f07cd1e rfl: 0x0000000000010246 cr2: 0x00007fff2067e4ee
Logical CPU: 1
Error Code: 0x00000000
Trap Number: 6
Thread 0 instruction stream:
fe fe fe fe fe fe 00 b9-20 00 00 00 45 85 c0 74 ........ ...E..t
07 41 0f bd c8 83 f1 1f-c1 e9 03 be 04 00 00 00 .A..............
48 29 ce 8d 0c f5 00 00-00 00 48 c7 c2 ff ff ff H)........H.....
ff 48 d3 e2 48 f7 d2 44-89 c1 48 01 c1 48 21 d1 .H..H..D..H..H!.
48 89 4d b8 48 8d 15 77-15 00 00 48 8d 7d b8 e8 H.M.H..w...H.}..
1e 35 2d 00 4c 89 fc 48-8b 7d d0 e8 12 df 32 00 .5-.L..H.}....2.
[0f]0b 55 48 89 e5 31 c0-5d c3 0f 1f 84 00 00 00 ..UH..1.]....... <==
00 00 55 48 89 e5 41 57-41 56 41 55 41 54 53 50 ..UH..AWAVAUATSP
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这是我的 Persistence.swift 文件：
import CloudKit
struct PersistenceController {
//MARK: - 1. PERSISTENCE CONTROLLER
static let shared = PersistenceController()
//MARK: - 2. PERSISTENT CONTAINER
let container: NSPersistentContainer
//MARK: - 3. INIT (load the persistent store)
init(inMemory: Bool = false) {
container = NSPersistentContainer(name: "Training")
if inMemory {
container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
}
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
}
//MARK: - 4. PREVIEW
static var preview: PersistenceController = {
let result = PersistenceController(inMemory: true)
let viewContext = result.container.viewContext
let plannedExercise1 = PlannedWorkouts(context: viewContext)
plannedExercise1.dateCreated = Date()
plannedExercise1.dateOfWorkout = Date()
plannedExercise1.duration = 3600.00
plannedExercise1.totalDistanceUnit = "meters"
plannedExercise1.totalDistanceDoubleValue = 5000.0
plannedExercise1.totalEnergyBurnedUnit = "KCal"
plannedExercise1.totalEnergyBurnedDoubleValue = 500.0
plannedExercise1.workoutActivityType = 32
plannedExercise1.id = UUID()
let plannedExercise2 = PlannedWorkouts(context: viewContext)
plannedExercise2.dateCreated = K.init().EndOfWeek(weeksSinceAnchorDate: 1)
plannedExercise2.dateOfWorkout = Date()
plannedExercise2.duration = 3600.00
plannedExercise2.totalDistanceUnit = "meters"
plannedExercise2.totalDistanceDoubleValue = 5000.0
plannedExercise2.totalEnergyBurnedUnit = "KCal"
plannedExercise2.totalEnergyBurnedDoubleValue = 500.0
plannedExercise2.workoutActivityType = 35
plannedExercise2.id = UUID()
let newStatisticChartView = ChartView(context: viewContext)
newStatisticChartView.id = UUID()
newStatisticChartView.chartViewRawValue = "dailyTrainingImpactChartView"
let newGoalView = GoalViews(context: viewContext)
newGoalView.startDate = K.init().EndOfWeek(weeksSinceAnchorDate: 1)
newGoalView.endDate = K.init().EndOfWeek(weeksSinceAnchorDate: 2)
newGoalView.id = UUID()
newGoalView.totalDistanceUnit = "meters"
newGoalView.totalDistanceDoubleValue = 30000
newGoalView.workoutActivityType = Int16(32)
let newProgram = Programs(context: viewContext)
let newProgrammedWorkout = ProgrammedWorkouts(context: viewContext)
let newPlannedProgram = PlannedPrograms(context: viewContext)
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
return result
}()
}
我已经重新启动Xcode并清除了派生数据。接下来我应该尝试什么？或者这是 SwiftUI 预览器对复杂应用程序构建的限制？
您问题的答案在调试输出的长字符串中。简单来说就是更新持久化容器框架自动创建的数据库Training.sqlite有问题
尝试手动删除这些文件夹/文件。您可以在错误消息中找到完整路径。
此外，正如其他发帖人所指出的，建议在构建预览数据库时使用 PersistentController.preview。然后它将始终在内存中从头开始创建。
您在预览中使用的是 PersistenceController.preview 还是 PersistenceController.shared？总是在你的预览中使用 .preview，因为它避免了将数据库保存到磁盘——根据你的错误，它看起来像是在尝试保存到磁盘，这会有点工作，但你会 运行错误。还要确保您的视图没有调用 PersistenceController.shared 而是传递上下文或使用环境变量。