Question

当我尝试使用CoreData插入一系列数据时，它随机崩溃，并显示以下错误消息：

2019-04-03 17:24:31.217510+0530 YOUR APP[8862:401750] [error] error: Serious application error.  Exception was caught during Core Data change processing.  This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification.  -[__NSCFSet addObject:]: attempt to insert nil with userInfo (null)
CoreData: error: Serious application error.  Exception was caught during Core Data change processing.  This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification.  -[__NSCFSet addObject:]: attempt to insert nil with userInfo (null)
2019-04-03 17:24:31.223609+0530 YOUR APP[8862:401750] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFSet addObject:]: attempt to insert nil'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000107c371bb __exceptionPreprocess + 331
    1   libobjc.A.dylib                     0x00000001071dd735 objc_exception_throw + 48
    2   CoreFoundation                      0x0000000107c37015 +[NSException raise:format:] + 197
    3   CoreFoundation                      0x0000000107c128da -[__NSCFSet addObject:] + 202
    4   CoreData                            0x00000001068cbb2b -[NSManagedObjectContext(_NSInternalChangeProcessing) _processPendingUpdates:] + 379
    5   CoreData                            0x00000001068c632b -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] + 1163
    6   CoreData                            0x000000010689ee8a _performRunLoopAction + 394
    7   CoreFoundation                      0x0000000107b9bc27 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
    8   CoreFoundation                      0x0000000107b960be __CFRunLoopDoObservers + 430
    9   CoreFoundation                      0x0000000107b96751 __CFRunLoopRun + 1537
    10  CoreFoundation                      0x0000000107b95e11 CFRunLoopRunSpecific + 625
    11  GraphicsServices                    0x000000011160a1dd GSEventRunModal + 62
    12  UIKitCore                           0x000000010c90a81d UIApplicationMain + 140
    13  YOUR APP                            0x0000000104e23031 main + 225
    14  libdyld.dylib                       0x000000010b419575 start + 1
    15  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

我无法弄清楚崩溃背后的原因，但是此崩溃发生在核心数据中“插入/检索”发生的1/3倍。

请在下面找到代码

public func insertUser(userList: [user], completion : (Bool) -> ()){
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        let context = appDelegate.persistentContainer.viewContext

        do {
            let userEntity = NSEntityDescription.entity(forEntityName: "User_Table", in: context)

            for user in userList {
                let userBrandName = NSManagedObject(entity: userEntity!, insertInto: context)

                userBrandName.setValue(id, forKey: "Identity")
                userBrandName.setValue(name, forKey: "Name")
.....
                userBrandName.setValue(discount, forKey: "Discount")

                try context.save()
            } 
            completion(true)

        } catch {
            completion(false)
        }

    }

我无法找到其背后的问题/原因。我是Swift和Core Data的新手

核心数据崩溃-NSManagedObjectContextObjectsDidChangeNotification：尝试使用userInfo插入nil

0 个答案: