本文介绍了核心数据NSManagedObject没有有效的NSEntityDescription的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试通过Xcode项目设置核心数据，并遇到一个我似乎无法消除的错误.我在StudyHub.xcdatamodeld内部有一个名为UserDetails的实体.我在AppDelegate中的代码:
I am trying to set up core data with my Xcode project and running into an error that I can't seem to get rid of. I have an entity called UserDetails inside of StudyHub.xcdatamodeld. My code in the AppDelegate:
// 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()
}
我用于检索存储在ViewController中的数据的代码:
My code for retrieving the data stored inside of a ViewController:
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
推荐答案
尝试更改:
let container = NSPersistentContainer(name: "DELETE")
对此:
let container = NSPersistentContainer(name: "StudyHub")
根据文档:
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