I'm having a weird issue. I have a watch app which communicates with the phone using a WCSessionDelegate.
if the phone app is open everything works fine, but if the app is closed, when the watch sends a message, my app is woken from the background, after which onAppear() is called in my app which causes a swiftData query to run.
Calling any swiftdata function from a backgrounded app causes it to immediately crash with the following stack trace. Any ideas what im doing wrong? or a better way to trigger my code instead of onAppear, so it won't be called when my watch wakes my app from the background?
.onAppear {
reloadData()
}
private func reloadData() {
let fetch = FetchDescriptor<SavedServer>(
predicate: nil,
sortBy: [.init(\.displayOrder)]
)
guard let results = try? modelContext.fetch(fetch) else {
self.rows = []
return
}
self.rows = results
}
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Incident Identifier: 057999AF-7840-410E-B3EE-29082C5AED00
CrashReporter Key: 28AF2AA0-4626-9964-9664-36077DAF4E1A
Hardware Model: MacBookPro18,2
Process: MC Status [68915]
Path: /Users/USER/Library/Developer/CoreSimulator/Devices/C61698BA-C4CA-4DD9-B824-DBF57AC65090/data/Containers/Bundle/Application/A685371C-9174-4CF7-9E99-D573310CC3E5/MC Status.app/MC Status
Identifier: com.shemeshapps.MinecraftServerStatus
Version: 2.0 (1)
Code Type: ARM-64 (Native)
Role: Non UI
Parent Process: launchd_sim [55432]
Coalition: com.apple.CoreSimulator.SimDevice.C61698BA-C4CA-4DD9-B824-DBF57AC65090 [164301]
Responsible Process: SimulatorTrampoline [53834]
OS Version: macOS 13.4.1 (22F82)
Release Type: User
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread: 0
Last Exception Backtrace:
0 CoreFoundation 0x18046589c __exceptionPreprocess + 160
1 libobjc.A.dylib 0x18005c09c objc_exception_throw + 56
2 CoreData 0x184989b94 -[NSFetchRequest(_NSInternalMethods) _incrementInUseCounter] + 0
3 CoreData 0x1849aa99c -[NSManagedObjectContext executeRequest:error:] + 164
4 CoreData 0x1848fe250 NSManagedObjectContext.fetch<A>(_:) + 80
5 SwiftData 0x1a89b7ad8 ModelContext.fetch<A>(_:) + 124
6 SwiftData 0x1a89c48c0 dispatch thunk of ModelContext.fetch<A>(_:) + 20
7 MC Status 0x102530ef4 MainAppContentView.reloadData(forceRefresh:) + 752 (MainAppContentView.swift:112)
8 MC Status 0x102533540 closure #2 in MainAppContentView.body.getter + 44 (MainAppContentView.swift:78)
9 SwiftUI 0x108a0b7a0 0x107b8c000 + 15202208
10 SwiftUI 0x108a0b7bc 0x107b8c000 + 15202236
11 SwiftUI 0x108a0b7a0 0x107b8c000 + 15202208
12 SwiftUI 0x108fdce70 0x107b8c000 + 21302896
13 SwiftUI 0x108fd6ec0 0x107b8c000 + 21278400
14 SwiftUI 0x1081edb24 0x107b8c000 + 6691620
15 SwiftUI 0x10928d650 0x107b8c000 + 24122960
16 libdispatch.dylib 0x1801424f4 _dispatch_call_block_and_release + 24
17 libdispatch.dylib 0x180143d3c _dispatch_client_callout + 16
18 libdispatch.dylib 0x180152b24 _dispatch_main_queue_drain + 1272
19 libdispatch.dylib 0x18015261c _dispatch_main_queue_callback_4CF + 40
20 CoreFoundation 0x1803c61b4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
21 CoreFoundation 0x1803c08cc __CFRunLoopRun + 1936
22 CoreFoundation 0x1803bfd28 CFRunLoopRunSpecific + 572
23 GraphicsServices 0x189864bc0 GSEventRunModal + 160
24 UIKitCore 0x103b30208 -[UIApplication _run] + 868
25 UIKitCore 0x103b33e80 UIApplicationMain + 124
26 SwiftUI 0x108a10524 0x107b8c000 + 15222052
27 SwiftUI 0x108a103c4 0x107b8c000 + 15221700
28 SwiftUI 0x108722088 0x107b8c000 + 12148872
29 MC Status 0x102506d30 static MCStatusApp.$main() + 40
30 MC Status 0x102506de0 main + 12 (MCStatusApp.swift:12)
31 dyld_sim 0x1028fd558 start_sim + 20
32 dyld 0x1026b1f28 start + 2236
33 ??? 0x3c15800000000000 ???
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x102f1cfa8 __pthread_kill + 8
1 libsystem_pthread.dylib 0x10285712c pthread_kill + 256
2 libsystem_c.dylib 0x1801375ec abort + 104
3 libc++abi.dylib 0x180263c78 abort_message + 128
4 libc++abi.dylib 0x180255198 demangling_terminate_handler() + 300
5 libobjc.A.dylib 0x180037bf0 _objc_terminate() + 124
6 libc++abi.dylib 0x180263150 std::__terminate(void (*)()) + 12
7 libc++abi.dylib 0x180263100 std::terminate() + 52
8 libdispatch.dylib 0x180143d50 _dispatch_client_callout + 36
9 libdispatch.dylib 0x180152b24 _dispatch_main_queue_drain + 1272
10 libdispatch.dylib 0x18015261c _dispatch_main_queue_callback_4CF + 40
11 CoreFoundation 0x1803c61b4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
12 CoreFoundation 0x1803c08cc __CFRunLoopRun + 1936
13 CoreFoundation 0x1803bfd28 CFRunLoopRunSpecific + 572
14 GraphicsServices 0x189864bc0 GSEventRunModal + 160
15 UIKitCore 0x103b30208 -[UIApplication _run] + 868
16 UIKitCore 0x103b33e80 UIApplicationMain + 124
17 SwiftUI 0x108a10524 0x107b8c000 + 15222052
18 SwiftUI 0x108a103c4 0x107b8c000 + 15221700
19 SwiftUI 0x108722088 0x107b8c000 + 12148872
20 MC Status 0x102506d30 static MCStatusApp.$main() + 40
21 MC Status 0x102506de0 main + 12 (MCStatusApp.swift:12)
22 dyld_sim 0x1028fd558 start_sim + 20
23 dyld 0x1026b1f28 start + 2236
