swift – 来自预填充SQLite的CoreData

我用CoreData填充了一个数据库,现在我想在我的应用程序中用swift作为默认数据库。 我已经读过了,但是我只在Objective-C中find了教程,而Xcode6在AppDelegate中创build的核心数据的方法对我来说是非常奇怪的…

这是代码:

// 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 "RLopez.BORRAME" in the application's documents Application Support directory. let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask) return urls[urls.count-1] as NSURL }() 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("iManager", withExtension: "momd") return NSManagedObjectModel(contentsOfURL: modelURL) }() lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = { // The persistent store coordinator for the application. This implementation creates and return 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 var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel) let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("iManager.sqlite") println(url) var error: NSError? = nil var failureReason = "There was an error creating or loading the application's saved data." if coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil, error: &error) == nil { coordinator = nil // Report any error we got. let dict = NSMutableDictionary() dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data" dict[NSLocalizedFailureReasonErrorKey] = failureReason dict[NSUnderlyingErrorKey] = error error = NSError.errorWithDomain("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 \(error), \(error!.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 if coordinator == nil { return nil } var managedObjectContext = NSManagedObjectContext() managedObjectContext.persistentStoreCoordinator = coordinator return managedObjectContext }() // MARK: - Core Data Saving support func saveContext () { if let moc = self.managedObjectContext { var error: NSError? = nil if moc.hasChanges && !moc.save(&error) { // 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. NSLog("Unresolved error \(error), \(error!.userInfo)") abort() } } } 

我想要的是使用我的应用程序包中的一个sqlite文件,而不是创build一个空的数据库。 我怎样才能做到这一点?

提前致谢!

你从应用程序包复制sqlite文件到持久存储的地方。

这是我的代码:

 lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = { var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel) let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("db.sqlite") //this part if (!NSFileManager.defaultManager().fileExistsAtPath(url.path!)) { let defaultStorePath = NSBundle.mainBundle().pathForResource("db", ofType:"sqlite") NSFileManager.defaultManager().copyItemAtPath(defaultStorePath!, toPath:url.path!, error: nil) } if coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil, error: nil) == nil { coordinator = nil } return coordinator }() 

这是SWIFT2的正确方法:

  lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = { var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel) let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("db.sqlite") //this part if (!NSFileManager.defaultManager().fileExistsAtPath(url.path!)) { let defaultStorePath = NSBundle.mainBundle().pathForResource("db", ofType:"sqlite") do { try NSFileManager.defaultManager().copyItemAtPath(defaultStorePath!, toPath:url.path!) } catch _ { } } do { try coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil) } catch _ { coordinator = nil } return coordinator }() 

Swift 3:

  lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = { var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel) let url = Globals.userDocumentsURL.appendingPathComponent("db.sqlite") //this part if (!FileManager.default.fileExists(atPath: url.path)) { let defaultStorePath = Bundle.main.path(forResource: "db", ofType:"sqlite") do { try FileManager.default.copyItem(atPath: defaultStorePath!, toPath:url.path) } catch _ { } } do { try coordinator!.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: nil) } catch _ { coordinator = nil } return coordinator }()