I received crash reports from Firebase Crashlytics and the same reports I see in XCode crashes tab, that application crashes in the first 2-5 seconds after launch when trying to fetch some data from DB. One interesting note that it's happens only on iOS 16.1.1, maybe who knows why it's happening? Here are a few parts of the code and stack trace:
final class MessagesViewController: UIViewController {
...
var conversation: Conversation?
private var _fetchedResultsController: NSFetchedResultsController<Message>?
private var fetchedResultsController: NSFetchedResultsController<Message>? {
if _fetchedResultsController == nil {
_fetchedResultsController = createFetchedResultsController()
}
return _fetchedResultsController
}
override func viewDidLoad() {
super.viewDidLoad()
performNewFetch()
loadData()
}
private func performNewFetch() {
self.fetchedResultsController?.fetchRequest.fetchLimit = 10
do {
try self.fetchedResultsController?.performFetch()
self.tableView.reloadData()
} catch {
}
}
func loadData() {
RestAPI.shared.fetchMessages() { pagination in
...
self.fetchedResultsController?.fetchRequest.fetchLimit = pagination.offset + pagination.limit
do {
try self.fetchedResultsController?.performFetch()
self.tableView.reloadData()
} catch {
}
...
}
}
private func createFetchedResultsController() -> NSFetchedResultsController<Message>? {
if let uuid = conversation?.uuid {
let fetchRequest = NSFetchRequest<Message>(entityName: "Message")
fetchRequest.sortDescriptors = [NSSortDescriptor(key: "createdAt", ascending: false)]
fetchRequest.fetchLimit = 10
fetchRequest.fetchOffset = 0
fetchRequest.predicate = NSPredicate(format: "conversation.uuid == %@", uuid)
let context = CoreDataManager.shared.managedObjectContext
let fetchResultsController = NSFetchedResultsController(fetchRequest: fetchRequest,
managedObjectContext: context,
sectionNameKeyPath: "sectionDate",
cacheName: nil)
fetchResultsController.delegate = self
return fetchResultsController
} else {
return nil
}
}
...
}
Conversation model:
class Conversation: NSManagedObject {
@NSManaged public var createdAt: NSDate?
@NSManaged public var uuid: String?
@NSManaged public var messages: NSSet?
}
Messages model:
class Message: NSManagedObject {
@NSManaged public var createdAt: NSDate?
@NSManaged public var sectionDate: String?
@NSManaged public var conversation: Conversation?
}
Crash stack trace:
Crashed: com.apple.main-thread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x000000082a3ab680
Crashed: com.apple.main-thread
0 libobjc.A.dylib 0x307c objc_retain_x8 + 16
1 CoreData 0x4a7f8 __43-[NSFetchedResultsController performFetch:]_block_invoke + 660
2 CoreData 0x837e8 developerSubmittedBlockToNSManagedObjectContextPerform + 156
3 CoreData 0x83338 -[NSManagedObjectContext performBlockAndWait:] + 208
4 CoreData 0x60688 -[NSFetchedResultsController _recursivePerformBlockAndWait:withContext:] + 152
5 CoreData 0x5e574 -[NSFetchedResultsController performFetch:] + 252
6 MyPsychic 0x3a224 MessagesViewController.performNewFetch() + 277 (MessagesViewController.swift:277)
7 MyPsychic 0x39e38 MessagesViewController.viewDidLoad() + 4338048568 (<compiler-generated>:4338048568)
8 MyPsychic 0x3ac24 @objc MessagesViewController.viewDidLoad() + 4338052132 (<compiler-generated>:4338052132)
9 UIKitCore 0x382dc4 -[UIViewController _sendViewDidLoadWithAppearanceProxyObjectTaggingEnabled] + 84
10 UIKitCore 0x1ae40 -[UIViewController loadViewIfRequired] + 712
11 UIKitCore 0x1ab58 -[UIViewController view] + 24
12 UIKitCore 0x2e0f04 -[UINavigationController _startCustomTransition:] + 892
13 UIKitCore 0x1a6f44 -[UINavigationController _startDeferredTransitionIfNeeded:] + 496
14 UIKitCore 0x1a6604 -[UINavigationController __viewWillLayoutSubviews] + 96
15 UIKitCore 0x1a6568 -[UILayoutContainerView layoutSubviews] + 172
16 UIKitCore 0x5020 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1980
17 QuartzCore 0x99ec CA::Layer::layout_if_needed(CA::Transaction*) + 500
18 QuartzCore 0x1d0a0 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 148
19 QuartzCore 0x2e5b0 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 456
20 QuartzCore 0x635ec CA::Transaction::commit() + 652
21 QuartzCore 0x4c8cc CA::Transaction::flush_as_runloop_observer(bool) + 88
22 UIKitCore 0x504b44 _UIApplicationFlushCATransaction + 52
23 UIKitCore 0x652740 _UIUpdateSequenceRun + 84
24 UIKitCore 0xc99fd0 schedulerStepScheduledMainSection + 172
25 UIKitCore 0xc9919c runloopSourceCallback + 92
26 CoreFoundation 0xd5f54 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28
27 CoreFoundation 0xe232c __CFRunLoopDoSource0 + 176
28 CoreFoundation 0x66210 __CFRunLoopDoSources0 + 244
29 CoreFoundation 0x7bba8 __CFRunLoopRun + 836
30 CoreFoundation 0x80ed4 CFRunLoopRunSpecific + 612
31 GraphicsServices 0x1368 GSEventRunModal + 164
32 UIKitCore 0x3a23d0 -[UIApplication _run] + 888
33 UIKitCore 0x3a2034 UIApplicationMain + 340
34 MyPsychic 0x9368 main + 16 (AppDelegate.swift:16)
35 ??? 0x1ecbe4960 (Missing)
