Swift 5.1 将核心数据添加到现有项目但我收到此错误

Question

2020-04-05 16:18:10.014238+0530 StayHome[2732:178019] [error] error: No NSEntityDescriptions in any model claim the NSManagedObject subclass 'NotifyDetails' so +entity is confused.  Have you loaded your NSManagedObjectModel yet ?
CoreData: error: No NSEntityDescriptions in any model claim the NSManagedObject subclass 'NotifyDetails' so +entity is confused.  Have you loaded your NSManagedObjectModel yet ?
2020-04-05 16:18:10.014435+0530 StayHome[2732:178019] [error] error: +[NotifyDetails entity] Failed to find a unique match for an NSEntityDescription to a managed object subclass
CoreData: error: +[NotifyDetails entity] Failed to find a unique match for an NSEntityDescription to a managed object subclass
2020-04-05 16:18:10.016103+0530 StayHome[2732:178019] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An NSManagedObject of class 'NotifyDetails' must have a valid NSEntityDescription.'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000110cb527e __exceptionPreprocess + 350
    1   libobjc.A.dylib                     0x000000010c3e5b20 objc_exception_throw + 48
    2   CoreData                            0x000000010c939d28 -[NSManagedObject initWithEntity:insertIntoManagedObjectContext:] + 485
    3   StayHome                            0x000000010b94470f $s8StayHome13NotifyDetailsC6entity10insertIntoACSo19NSEntityDescriptionC_So22NSManagedObjectContextCSgtcfc + 111
    4   StayHome                            0x000000010b9447fc $s8StayHome13NotifyDetailsC6entity10insertIntoACSo19NSEntityDescriptionC_So22NSManagedObjectContextCSgtcfcTo + 76
    5   CoreData                            0x000000010c9e767e -[NSManagedObject initWithContext:] + 290
    6   StayHome                            0x000000010b90484f $sSo15NSManagedObjectC7contextABSo0aB7ContextC_tcfcTO + 31
    7   StayHome                            0x000000010b9042b7 $sSo15NSManagedObjectC7contextABSo0aB7ContextC_tcfC + 39
    8   StayHome                            0x000000010b903f7a $s8StayHome13LocalDatabaseV0C4DatayySS_SStF + 282
    9   StayHome                            0x000000010b9079ef $s8StayHome17LocalNotificationC0D0yySS_SStFySb_s5Error_pSgtcfU_ + 223
    10  StayHome                            0x000000010b907f6f $sSbs5Error_pSgIegyg_SbSo7NSErrorCSgIeyByy_TR + 127
    11  libdispatch.dylib                   0x0000000111afedd4 _dispatch_call_block_and_release + 12
    12  libdispatch.dylib                   0x0000000111affd48 _dispatch_client_callout + 8
    13  libdispatch.dylib                   0x0000000111b065ef _dispatch_lane_serial_drain + 788
    14  libdispatch.dylib                   0x0000000111b071b5 _dispatch_lane_invoke + 476
    15  libdispatch.dylib                   0x0000000111b12a4e _dispatch_workloop_worker_thread + 719
    16  libsystem_pthread.dylib             0x0000000111f7c6fc _pthread_wqthread + 290
    17  libsystem_pthread.dylib             0x0000000111f7b827 start_wqthread + 15
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

Answer 1

我遇到了同样的问题并尝试了多种解决方案，例如注释掉

@objc(CheatTime)

或在 .xcdatamodeld 中选择当前产品模块

没有任何效果。

在那之后，我尝试在添加新对象之前发出获取请求并且成功了所以在我的案例中，我添加了以下代码：

let request = CheatTime.fetchRequest() as NSFetchRequest<CheatTime>
request.sortDescriptors = [NSSortDescriptor(key: #keyPath(CheatTime.numberOfHours), ascending: true)]
let fetchedRC = NSFetchedResultsController(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
try? fetchedRC.performFetch()

之后添加对象没有问题，不仅是第一个对象类型（在我的示例中是 CheatTime），而且第二个对象类型也是如此（没有额外的获取请求）

Swift 5.1 将核心数据添加到现有项目但我收到此错误

Swit 5.1 Adding CoreData to an Existing project But I got this error

swift5.1