核心数据NSManagedObject没有有效的NSEntityDescription
我试图用我的Xcode项目设置核心数据，并运行一个我似乎无法摆脱的错误。 在StudyHub.xcdatamodeld有一个名为UserDetails的实体。 我在AppDelegate中的代码：
// MARK: - Core Data stack lazy var persistentContainer: NSPersistentContainer = { /* The persistent container for the application. This implementation creates and returns a container, having loaded the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail. */ let container = NSPersistentContainer(name: "DELETE") container.loadPersistentStores(completionHandler: { (storeDescription, error) in if let error = error as NSError? { // Replace this implementation with code to handle the error appropriately. // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. /* Typical reasons for an error here include: * The parent directory does not exist, cannot be created, or disallows writing. * The persistent store is not accessible, due to permissions or data protection when the device is locked. * The device is out of space. * The store could not be migrated to the current model version. Check the error message to determine what the actual problem was. */ fatalError("Unresolved error \(error), \(error.userInfo)") } }) return container }() // MARK: - Core Data Saving support func saveContext () { let context = persistentContainer.viewContext if context.hasChanges { do { try context.save() } catch { // Replace this implementation with code to handle the error appropriately. // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. let nserror = error as NSError fatalError("Unresolved error \(nserror), \(nserror.userInfo)") } } } // MARK: Send Data to CoreData func saveUserDetails(data: [String: String]) { let appDelegate = UIApplication.shared.delegate as! AppDelegate let context = appDelegate.persistentContainer.viewContext let user = UserDetails(context: context) if let authenticatedWith = data["authenticatedWith"] { user.authenticatedWith = authenticatedWith } if let email = data["email"] { user.email = email } if let fullName = data["fullName"] { user.fullName = fullName } if let username = data["username"] { user.username = username } if let schoolName = data["schoolName"] { user.schoolName = schoolName } if let schoolUID = data["schoolUID"] { user.schoolUID = schoolUID } if let facebookLink = data["facebookLink"] { user.facebookLink = facebookLink } if let twitterLink = data["twitterLink"] { user.twitterLink = twitterLink } if let instagramLink = data["instagramLink"] { user.instagramLink = instagramLink } if let vscoLink = data["vscoLink"] { user.vscoLink = vscoLink } appDelegate.saveContext() }
我的代码检索存储在一个ViewController里面的数据：
let user = UserDetails() if (user.username != "") { self.navigationItem.title = user.username } else { self.navigationItem.title = "Account." } self.usersNameLabel.text = user.fullName if (user.schoolName != "") { self.usersSchoolNameLabel.setTitle(user.schoolName, for: .normal) self.usersSchoolNameLabel.isHidden = false } else { self.addSchoolButton.isHidden = false } self.checkSocialLink(link: user.facebookLink!, button: self.facebookLinkButton) // TODO: Force unwrap might not work self.checkSocialLink(link: user.twitterLink!, button: self.twitterLinkButton) self.checkSocialLink(link: user.instagramLink!, button: self.instagramLinkButton) self.checkSocialLink(link: user.vscoLink!, button: self.vscoLinkButton)
我得到的错误：
2017-01-13 21:22:58.675995 StudyHub[3328:27695] [error] error: Failed to load model named DELETE CoreData: error: Failed to load model named DELETE 2017-01-13 21:22:58.699 StudyHub[3328:27695] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An NSManagedObject of class 'UserDetails' must have a valid NSEntityDescription.' *** First throw call stack: ( 0 CoreFoundation 0x0000000114fa2d4b __exceptionPreprocess + 171 1 libobjc.A.dylib 0x0000000114a0b21e objc_exception_throw + 48 2 CoreData 0x000000010ffe0fb0 -[NSManagedObject initWithEntity:insertIntoManagedObjectContext:] + 528 3 StudyHub 0x000000010edee13c _TFC8StudyHub11UserDetailscfT6entityCSo19NSEntityDescription10insertIntoGSqCSo22NSManagedObjectContext__S0_ + 76 4 StudyHub 0x000000010edee212 _TToFC8StudyHub11UserDetailscfT6entityCSo19NSEntityDescription10insertIntoGSqCSo22NSManagedObjectContext__S0_ + 66 5 CoreData 0x0000000110082d79 -[NSManagedObject initWithContext:] + 793 6 StudyHub 0x000000010ed05dd4 _TTOFCSo15NSManagedObjectcfT7contextCSo22NSManagedObjectContext_S_ + 36 7 StudyHub 0x000000010ed0211c _TFCSo15NSManagedObjectCfT7contextCSo22NSManagedObjectContext_S_ + 76 8 StudyHub 0x000000010ed009e5 _TFFC8StudyHub11AppDelegate11applicationFTCSo13UIApplication29didFinishLaunchingWithOptionsGSqGVs10DictionaryVSC29UIApplicationLaunchOptionsKeyP____SbL_15saveUserDetailsFT4dataGS2_SSSS__T_ + 421 9 StudyHub 0x000000010ed02837 _TFFC8StudyHub11AppDelegate11applicationFTCSo13UIApplication29didFinishLaunchingWithOptionsGSqGVs10DictionaryVSC29UIApplicationLaunchOptionsKeyP____SbU1_FCSo15FIRDataSnapshotT_ + 1607 10 StudyHub 0x000000010ed0290c _TTRXFo_oCSo15FIRDataSnapshot__XFdCb_dS___ + 60 11 StudyHub 0x000000010eedb4af __43-[FValueEventRegistration fireEvent:queue:]_block_invoke.57 + 78 12 libdispatch.dylib 0x0000000115df3978 _dispatch_call_block_and_release + 12 13 libdispatch.dylib 0x0000000115e1d0cd _dispatch_client_callout + 8 14 libdispatch.dylib 0x0000000115dfd8a4 _dispatch_main_queue_callback_4CF + 406 15 CoreFoundation 0x0000000114f66e49 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 16 CoreFoundation 0x0000000114f2c37d __CFRunLoopRun + 2205 17 CoreFoundation 0x0000000114f2b884 CFRunLoopRunSpecific + 420 18 GraphicsServices 0x0000000117ba4a6f GSEventRunModal + 161 19 UIKit 0x00000001131bfc68 UIApplicationMain + 159 20 StudyHub 0x000000010ed04d4f main + 111 21 libdyld.dylib 0x0000000115e6968d start + 1 22 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException
尝试改变：
let container = NSPersistentContainer(name: "DELETE")
对此：
let container = NSPersistentContainer(name: "StudyHub")
据文件记载 ：
默认情况下，提供的名称值用于命名持久性存储，并用于查找要与NSPersistentContainer对象一起使用的NSManagedObjectModel对象的名称。
我有一个类似的问题。 我进入了App Delegate，发现let container = NSPersistentContainer(name: "Your App Name")与我的数据模型的名称不匹配。
我将其更改为我的数据模型的名称，现在可以工作。