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CoreData stack for iOS 9 and iOS 10 using Swift 3
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// | |
// Storage.swift | |
// | |
// Created by Grigory Avdyushin on 30.06.16. | |
// Copyright © 2016 Grigory Avdyushin. All rights reserved. | |
// | |
import UIKit | |
import CoreData | |
/// NSPersistentStoreCoordinator extension | |
extension NSPersistentStoreCoordinator { | |
/// NSPersistentStoreCoordinator error types | |
public enum CoordinatorError: Error { | |
/// .momd file not found | |
case modelFileNotFound | |
/// NSManagedObjectModel creation fail | |
case modelCreationError | |
/// Gettings document directory fail | |
case storePathNotFound | |
} | |
/// Return NSPersistentStoreCoordinator object | |
static func coordinator(name: String) throws -> NSPersistentStoreCoordinator? { | |
guard let modelURL = Bundle.main.url(forResource: name, withExtension: "momd") else { | |
throw CoordinatorError.modelFileNotFound | |
} | |
guard let model = NSManagedObjectModel(contentsOf: modelURL) else { | |
throw CoordinatorError.modelCreationError | |
} | |
let coordinator = NSPersistentStoreCoordinator(managedObjectModel: model) | |
guard let documents = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last else { | |
throw CoordinatorError.storePathNotFound | |
} | |
do { | |
let url = documents.appendingPathComponent("\(name).sqlite") | |
let options = [ NSMigratePersistentStoresAutomaticallyOption : true, | |
NSInferMappingModelAutomaticallyOption : true ] | |
try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: options) | |
} catch { | |
throw error | |
} | |
return coordinator | |
} | |
} | |
struct Storage { | |
static var shared = Storage() | |
@available(iOS 10.0, *) | |
private lazy var persistentContainer: NSPersistentContainer = { | |
let container = NSPersistentContainer(name: "Model") | |
container.loadPersistentStores { (storeDescription, error) in | |
print("CoreData: Inited \(storeDescription)") | |
guard error == nil else { | |
print("CoreData: Unresolved error \(error)") | |
return | |
} | |
} | |
return container | |
}() | |
private lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = { | |
do { | |
return try NSPersistentStoreCoordinator.coordinator(name: "Model") | |
} catch { | |
print("CoreData: Unresolved error \(error)") | |
} | |
return nil | |
}() | |
private lazy var managedObjectContext: NSManagedObjectContext = { | |
let coordinator = self.persistentStoreCoordinator | |
var managedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType) | |
managedObjectContext.persistentStoreCoordinator = coordinator | |
return managedObjectContext | |
}() | |
// MARK: Public methods | |
enum SaveStatus { | |
case saved, rolledBack, hasNoChanges | |
} | |
var context: NSManagedObjectContext { | |
mutating get { | |
if #available(iOS 10.0, *) { | |
return persistentContainer.viewContext | |
} else { | |
return managedObjectContext | |
} | |
} | |
} | |
mutating func save() -> SaveStatus { | |
if context.hasChanges { | |
do { | |
try context.save() | |
return .saved | |
} catch { | |
context.rollback() | |
return .rolledBack | |
} | |
} | |
return .hasNoChanges | |
} | |
} |
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