我是Swift和iPhone应用程序的新手。最近我用Tabbed Application创建了一个项目。由于我已经完成了我的项目，最后一步是添加核心数据以保存我的信息。我决定使用核心数据创建一个新的单视图应用程序，并将其核心数据功能从Single View Application AppDelegate复制到Tabbed Application AppDelegate。
这是我复制的代码（从Single View Application到Tabbed Application，AppDelegate.swift）：
func applicationWillTerminate(application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
// Saves changes in the application's managed object context before the application terminates.
self.saveContext()
}
// MARK: - Core Data stack
lazy var applicationDocumentsDirectory: NSURL = {
// The directory the application uses to store the Core Data store file. This code uses a directory named "com.Spookas.bandymas" in the application's documents Application Support directory.
let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
return urls[urls.count-1]
}()
lazy var managedObjectModel: NSManagedObjectModel = {
// The managed object model for the application. This property is not optional. It is a fatal error for the application not to be able to find and load its model.
let modelURL = NSBundle.mainBundle().URLForResource("Model", withExtension: "momd")!
return NSManagedObjectModel(contentsOfURL: modelURL)!
}()
lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
// The persistent store coordinator for the application. This implementation creates and returns a coordinator, having added 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.
// Create the coordinator and store
let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("SingleViewCoreData.sqlite")
var failureReason = "There was an error creating or loading the application's saved data."
do {
try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil)
} catch {
// Report any error we got.
var dict = [String: AnyObject]()
dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
dict[NSLocalizedFailureReasonErrorKey] = failureReason
dict[NSUnderlyingErrorKey] = error as NSError
let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
// Replace this with code to handle the error appropriately.
// abort() 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.
NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)")
abort()
}
return coordinator
}()
lazy var managedObjectContext: NSManagedObjectContext = {
// Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.) This property is optional since there are legitimate error conditions that could cause the creation of the context to fail.
let coordinator = self.persistentStoreCoordinator
var managedObjectContext = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
managedObjectContext.persistentStoreCoordinator = coordinator
return managedObjectContext
}()
// MARK: - Core Data Saving support
func saveContext () {
if managedObjectContext.hasChanges {
do {
try managedObjectContext.save()
} catch {
// Replace this implementation with code to handle the error appropriately.
// abort() 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
NSLog("Unresolved error \(nserror), \(nserror.userInfo)")
abort()
}
}
}
编写代码时没有错误;但是，当我启动一个应用程序并执行任何应该保存数据的方法时，我收到此错误：
2016-06-15 10：55：19.182 Taupyk！[1387：32488] CoreData：加载失败 带URL的NSManagedObjectModel “文件：///用户/ MyMac /库/开发商/ CoreSimulator /设备/ 029E41C4-9E00-474A-BBA1-410D1211D39F /数据/集装箱/包/应用/ FE7605D7-A2F3-449E-8961-F0B33FCB4D15 / Taupyk的.app！ /Model.momd/” 致命错误：在解包可选值时意外发现nil
然后指向这些代码行：
lazy var managedObjectModel: NSManagedObjectModel = {
// The managed object model for the application. This property is not optional. It is a fatal error for the application not to be able to find and load its model.
let modelURL = NSBundle.mainBundle().URLForResource("Model", withExtension: "momd")!
return NSManagedObjectModel(contentsOfURL: modelURL)!
}()
它说的是关于线程1：EXC_BAD_INSTRUCTION（代码= EXC_1386_INVOP，子代码= 0x0）
我还从单一视图应用程序项目中复制了数据模型并将其重命名为“模型”，但它仍然会抛出错误
我看到有其他人喜欢我，然而，他们能够解决问题而我不能也不明白为什么它不起作用，即使我做了同样的事情
感谢您的提前帮助
答案 0 :(得分：1)
您缺少实际的CoreData数据库。
注意，您也会在单个视图项目中看到这一点。
答案 1 :(得分：0)
2.核心数据 - ＆gt;数据模型 - >点击下一步按钮 - ＆gt;点击创建按钮。