当我升级到iOS 13时，我的应用程序中的许多东西似乎都坏了。其中之一是如何保存我的数据。当我点击“保存”按钮时，出现此未解决的错误：
Unresolved error Error Domain=NSCocoaErrorDomain Code=132001 "(null)" UserInfo={message=attempt to recursively call -save: on the context aborted, stack trace=(
0 CoreData 0x00007fff23759236 -[NSManagedObjectContext save:] + 170
1 owed 0x000000010f86f76a $s4owed13CoreDataStackC11saveContextyyF + 186
2 owed 0x000000010f8d8347 $s4owed14ViewControllerC05tableB0_12cellForRowAtSo07UITableB4CellCSo0iB0C_10Foundation9IndexPathVtF + 10215
3 owed 0x000000010f8d8cb5 $s4owed14ViewControllerC05tableB0_12cellForRowAtSo07UITableB4CellCSo0iB0C_10Foundation9IndexPathVtFTo + 165
4 UIKitCore 0x00007fff47360e4b -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 787
5 UIKitCore 0x00007fff47361364 -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 73
6 UIKitCore 0x00007fff4738ea9c -[_UITableViewUpdateSupport(Private) _setupAnimationsForNewlyInsertedCells] + 7750
7 UIKitCore 0x00007fff4739805f -[_UITableViewUpdateSupport _setupAnimations] + 118
8 UIKitCore 0x00007fff4732efb0 -[UITableView _updateWithItems:updateSupport:] + 2883
9 UIKitCore 0x00007fff47326f5f -[UITableView _endCellAnimationsWithContext:] + 17188
10 UIKitCore 0x00007fff47340d22 -[UITableView endUpdatesWithContext:] + 112
11 owed 0x000000010f8db9fb $s4owed14ViewControllerC26controllerDidChangeContentyySo016NSFetchedResultsC0CySo20NSFetchRequestResult_pGF + 267
12 owed 0x000000010f8dba64 $s4owed14ViewControllerC26controllerDidChangeContentyySo016NSFetchedResultsC0CySo20NSFetchRequestResult_pGFTo + 68
13 CoreData 0x00007fff238e00be __82-[NSFetchedResultsController(PrivateMethods) _core_managedObjectContextDidChange:]_block_invoke + 7591
14 CoreData 0x00007fff2376ebfb developerSubmittedBlockToNSManagedObjectContextPerform + 154
15 CoreData 0x00007fff2376eae2 -[NSManagedObjectContext performBlockAndWait:] + 197
16 CoreData 0x00007fff238de305 -[NSFetchedResultsController(PrivateMethods) _core_managedObjectContextDidChange:] + 105
17 CoreFoundation 0x00007fff23ac2c1c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
18 CoreFoundation 0x00007fff23ac20a5 _CFXRegistrationPost1 + 421
19 CoreFoundation 0x00007fff23ac1e0f ___CFXNotificationPost_block_invoke + 175
20 CoreFoundation 0x00007fff23bbffe3 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1811
21 CoreFoundation 0x00007fff23ac1776 _CFXNotificationPost + 950
22 Foundation 0x00007fff2564d429 -[NSNotificationCenter postNotificationName:object:userInfo:] + 59
23 CoreData 0x00007fff2375b4fe -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] + 541
24 CoreData 0x00007fff237feb3a -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:deletions:updates:refreshes:deferrals:wasMerge:] + 1557
25 CoreData 0x00007fff23755ff3 -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] + 1217
26 CoreData 0x00007fff237592fb -[NSManagedObjectContext save:] + 367
27 owed 0x000000010f86f76a $s4owed13CoreDataStackC11saveContextyyF + 186
28 owed 0x000000010f955d53 $s4owed23AddPersonViewControllerC8saveNameyyypF + 11699
29 owed 0x000000010f956360 $s4owed23AddPersonViewControllerC8saveNameyyypFTo + 80
30 UIKitCore 0x00007fff47163d19 -[UIApplication sendAction:to:from:forEvent:] + 83
31 UIKitCore 0x00007fff46b55599 -[UIControl sendAction:to:forEvent:] + 223
32 UIKitCore 0x00007fff46b558e3 -[UIControl _sendActionsForEvents:withEvent:] + 398
33 UIKitCore 0x00007fff46b54842 -[UIControl touchesEnded:withEvent:] + 481
34 UIKitCore 0x00007fff4719e21f -[UIWindow _sendTouchesForEvent:] + 2604
35 UIKitCore 0x00007fff4719fb26 -[UIWindow sendEvent:] + 4596
36 UIKitCore 0x00007fff4717b1a7 -[UIApplication sendEvent:] + 356
37 UIKitCore 0x00007fff471faa18 __dispatchPreprocessedEventFromEventQueue + 6847
38 UIKitCore 0x00007fff471fd4de __handleEventQueueInternal + 5980
39 CoreFoundation 0x00007fff23afbac1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
40 CoreFoundation 0x00007fff23afb9ec __CFRunLoopDoSource0 + 76
41 CoreFoundation 0x00007fff23afb1c4 __CFRunLoopDoSources0 + 180
42 CoreFoundation 0x00007fff23af5ecf __CFRunLoopRun + 1263
43 CoreFoundation 0x00007fff23af56b6 CFRunLoopRunSpecific + 438
44 GraphicsServices 0x00007fff3815cbb0 GSEventRunModal + 65
45 UIKitCore 0x00007fff47162a67 UIApplicationMain + 1621
46 owed 0x000000010f8fe4db main + 75
47 libdyld.dylib 0x00007fff5123bcf5 start + 1
)}, ["stack trace": <_NSCallStackArray 0x600000e5d560>(
0 CoreData 0x00007fff23759236 -[NSManagedObjectContext save:] + 170,
1 owed 0x000000010f86f76a $s4owed13CoreDataStackC11saveContextyyF + 186,
2 owed 0x000000010f8d8347 $s4owed14ViewControllerC05tableB0_12cellForRowAtSo07UITableB4CellCSo0iB0C_10Foundation9IndexPathVtF + 10215,
3 owed 0x000000010f8d8cb5 $s4owed14ViewControllerC05tableB0_12cellForRowAtSo07UITableB4CellCSo0iB0C_10Foundation9IndexPathVtFTo + 165,
4 UIKitCore 0x00007fff47360e4b -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 787,
5 UIKitCore 0x00007fff47361364 -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 73,
6 UIKitCore 0x00007fff4738ea9c -[_UITableViewUpdateSupport(Private) _setupAnimationsForNewlyInsertedCells] + 7750,
7 UIKitCore 0x00007fff4739805f -[_UITableViewUpdateSupport _setupAnimations] + 118,
8 UIKitCore 0x00007fff4732efb0 -[UITableView _updateWithItems:updateSupport:] + 2883,
9 UIKitCore 0x00007fff47326f5f -[UITableView _endCellAnimationsWithContext:] + 17188,
10 UIKitCore 0x00007fff47340d22 -[UITableView endUpdatesWithContext:] + 112,
11 owed 0x000000010f8db9fb $s4owed14ViewControllerC26controllerDidChangeContentyySo016NSFetchedResultsC0CySo20NSFetchRequestResult_pGF + 267,
12 owed 0x000000010f8dba64 $s4owed14ViewControllerC26controllerDidChangeContentyySo016NSFetchedResultsC0CySo20NSFetchRequestResult_pGFTo + 68,
13 CoreData 0x00007fff238e00be __82-[NSFetchedResultsController(PrivateMethods) _core_managedObjectContextDidChange:]_block_invoke + 7591,
14 CoreData 0x00007fff2376ebfb developerSubmittedBlockToNSManagedObjectContextPerform + 154,
15 CoreData 0x00007fff2376eae2 -[NSManagedObjectContext performBlockAndWait:] + 197,
16 CoreData 0x00007fff238de305 -[NSFetchedResultsController(PrivateMethods) _core_managedObjectContextDidChange:] + 105,
17 CoreFoundation 0x00007fff23ac2c1c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12,
18 CoreFoundation 0x00007fff23ac20a5 _CFXRegistrationPost1 + 421,
19 CoreFoundation 0x00007fff23ac1e0f ___CFXNotificationPost_block_invoke + 175,
20 CoreFoundation 0x00007fff23bbffe3 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1811,
21 CoreFoundation 0x00007fff23ac1776 _CFXNotificationPost + 950,
22 Foundation 0x00007fff2564d429 -[NSNotificationCenter postNotificationName:object:userInfo:] + 59,
23 CoreData 0x00007fff2375b4fe -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] + 541,
24 CoreData 0x00007fff237feb3a -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:deletions:updates:refreshes:deferrals:wasMerge:] + 1557,
25 CoreData 0x00007fff23755ff3 -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] + 1217,
26 CoreData 0x00007fff237592fb -[NSManagedObjectContext save:] + 367,
27 owed 0x000000010f86f76a $s4owed13CoreDataStackC11saveContextyyF + 186,
28 owed 0x000000010f955d53 $s4owed23AddPersonViewControllerC8saveNameyyypF + 11699,
29 owed 0x000000010f956360 $s4owed23AddPersonViewControllerC8saveNameyyypFTo + 80,
30 UIKitCore 0x00007fff47163d19 -[UIApplication sendAction:to:from:forEvent:] + 83,
31 UIKitCore 0x00007fff46b55599 -[UIControl sendAction:to:forEvent:] + 223,
32 UIKitCore 0x00007fff46b558e3 -[UIControl _sendActionsForEvents:withEvent:] + 398,
33 UIKitCore 0x00007fff46b54842 -[UIControl touchesEnded:withEvent:] + 481,
34 UIKitCore 0x00007fff4719e21f -[UIWindow _sendTouchesForEvent:] + 2604,
35 UIKitCore 0x00007fff4719fb26 -[UIWindow sendEvent:] + 4596,
36 UIKitCore 0x00007fff4717b1a7 -[UIApplication sendEvent:] + 356,
37 UIKitCore 0x00007fff471faa18 __dispatchPreprocessedEventFromEventQueue + 6847,
38 UIKitCore 0x00007fff471fd4de __handleEventQueueInternal + 5980,
39 CoreFoundation 0x00007fff23afbac1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17,
40 CoreFoundation 0x00007fff23afb9ec __CFRunLoopDoSource0 + 76,
41 CoreFoundation 0x00007fff23afb1c4 __CFRunLoopDoSources0 + 180,
42 CoreFoundation 0x00007fff23af5ecf __CFRunLoopRun + 1263,
43 CoreFoundation 0x00007fff23af56b6 CFRunLoopRunSpecific + 438,
44 GraphicsServices 0x00007fff3815cbb0 GSEventRunModal + 65,
45 UIKitCore 0x00007fff47162a67 UIApplicationMain + 1621,
46 owed 0x000000010f8fe4db main + 75,
47 libdyld.dylib 0x00007fff5123bcf5 start + 1
)
, "message": attempt to recursively call -save: on the context aborted]
这是保存功能：
/* =====================================
Save Function
======================================*/
@IBAction func saveName(_ sender: Any) {
/* STEP 1 - Check to see if there is a person name in the input field */
guard name.text! != "", name.text! != "Add Name" else {
// call the warning function
warningText = "You forgot to add a name."
warningMessage()
return
}
/* STEP 2 - Check to see if that persons names was already used */
let personFetchRequest: NSFetchRequest<Person> = Person.fetchRequest()
personFetchRequest.predicate = NSPredicate(format: "name == %@", name.text!)
print(name.text!)
do{
let results = try coreDataStack.managedContext.fetch(personFetchRequest)
print("\(results.count) this is the results count for the predicate")
guard results.count == 0 else{
// print("The Same Name is Used")
warningText = "You already used that name."
warningMessage()
return
}
/* STEP 3 - Use the name that was typed in */
let person = Person(entity: Person.entity(), insertInto: coreDataStack.managedContext)
let trimmedName = name.text!.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
person.name = trimmedName
if(email.text! == "" || email.text! == "Email Address"){
person.email = "Email Address"
}else{
person.email = email.text
}
if(mobile.text == "" || mobile.text == "Mobile Number"){
person.mobile = "Mobile Number"
}
else{
person.mobile = mobile.text
}
person.dateCreated = NSDate() as Date
person.priority = 9999
/* STEP 4 - Save the data */
coreDataStack.saveContext()
self.dismiss(animated: true, completion: {});
}catch{
print("Error")
}
self.dissmissViewController(cancelBtn!)
}
当我关闭应用程序并将其打开时，将显示正确的数据。我不确定该错误对我说了什么，以弄清楚从哪里开始研究答案。
答案 0 :(得分：1)
要在没有更多代码的情况下准确地查看正在发生的事情有点困难，但似乎是在告诉您您要递归保存上下文（即出于某种原因，保存上下文的行为导致保存了上下文，这导致上下文被保存，导致上下文被保存。...等）
从调用堆栈看来，正在发生以下情况：
FetchedResultsController会收到有关更改的通知。UITableView使用新数据进行更新FetchedResultsController会收到有关某些更改的通知。我会在调用coreDataStack.saveContext()的任何地方放置断点，运行应用程序，然后尝试查看为什么保存后显示单元格时递归调用它。