Created
August 16, 2018 14:11
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CoreData Manager
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import CoreData | |
import Foundation | |
class CoreDataManager { | |
// Singleton | |
static let instance = CoreDataManager() | |
private init() {} | |
// Entity for Name | |
func entityForName(entityName: String) -> NSEntityDescription { | |
return NSEntityDescription.entity(forEntityName: entityName, in: self.managedObjectContext)! | |
} | |
// MARK: - Core Data stack | |
lazy var applicationDocumentsDirectory: NSURL = { | |
let urls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask) | |
return urls[urls.count-1] as NSURL | |
}() | |
lazy var managedObjectModel: NSManagedObjectModel = { | |
let modelURL = Bundle.main.url(forResource: "core_data", withExtension: "momd")! | |
return NSManagedObjectModel(contentsOf: modelURL)! | |
}() | |
lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = { | |
let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel) | |
let url = self.applicationDocumentsDirectory.appendingPathComponent("SingleViewCoreData.sqlite") | |
var failureReason = "There was an error creating or loading the application's saved data." | |
do { | |
try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: nil) | |
} catch { | |
var dict = [String: AnyObject]() | |
dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data" as AnyObject | |
dict[NSLocalizedFailureReasonErrorKey] = failureReason as AnyObject | |
dict[NSUnderlyingErrorKey] = error as NSError | |
let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict) | |
NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)") | |
abort() | |
} | |
return coordinator | |
}() | |
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: "iFootpath") | |
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 | |
}() | |
lazy var managedObjectContext: NSManagedObjectContext = { | |
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 { | |
let nserror = error as NSError | |
NSLog("Unresolved error \(nserror), \(nserror.userInfo)") | |
abort() | |
} | |
} | |
} | |
} | |
class Customer: NSManagedObject { | |
convenience init() { | |
self.init(entity: CoreDataManager.instance.entityForName(entityName: "Entity name"), insertInto: CoreDataManager.instance.managedObjectContext) | |
} | |
} | |
protocol EntityCreating { | |
init(within context: NSManagedObjectContext) | |
} | |
extension EntityCreating where Self: NSManagedObject { | |
init(within context: NSManagedObjectContext = CoreDataManager.instance.managedObjectContext) { | |
self = NSEntityDescription.insertNewObject(forEntityName: "\(Self.self)", into: context) as! Self | |
} | |
} | |
extension Customer: EntityCreating { | |
} | |
let c = Customer() | |
// Если надо, то | |
//let c = Customer(within: otherCustomContext) | |
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