我想在今天的扩展中使用核心数据。 我在下面尝试了一些方法。
创建app app并定位到app和today extension!
完整代码在这里:
final class CoreDataStack {
static let sharedStack = CoreDataStack()
var errorHandler: (Error) -> Void = {_ in }
//#1
lazy var persistentContainer: NSPersistentContainer = {
let container = NSPersistentContainer(name: "spark")
container.loadPersistentStores(completionHandler: { [weak self](storeDescription, error) in
if let error = error {
NSLog("CoreData error \(error), \(error._userInfo)")
self?.errorHandler(error)
}
})
return container
}()
//#2
lazy var viewContext: NSManagedObjectContext = {
return self.persistentContainer.viewContext
}()
//#3
// Optional
lazy var backgroundContext: NSManagedObjectContext = {
return self.persistentContainer.newBackgroundContext()
}()
//#4
func performForegroundTask(_ block: @escaping (NSManagedObjectContext) -> Void) {
self.viewContext.perform {
block(self.viewContext)
}
}
//#5
func performBackgroundTask(_ block: @escaping (NSManagedObjectContext) -> Void) {
self.persistentContainer.performBackgroundTask(block)
}
private init() {
//#1
NotificationCenter.default.addObserver(self,
selector: #selector(mainContextChanged(notification:)),
name: .NSManagedObjectContextDidSave,
object: self.managedObjectContext)
NotificationCenter.default.addObserver(self,
selector: #selector(bgContextChanged(notification:)),
name: .NSManagedObjectContextDidSave,
object: self.backgroundManagedObjectContext)
}
deinit {
NotificationCenter.default.removeObserver(self)
}
//#2
lazy var libraryDirectory: NSURL = {
let urls = FileManager.default.urls(for: .libraryDirectory, in: .userDomainMask)
return urls[urls.count-1] as NSURL
}()
//#3
lazy var managedObjectModel: NSManagedObjectModel = {
let modelURL = Bundle.main.url(forResource: "spark", withExtension: "momd")!
return NSManagedObjectModel(contentsOf: modelURL)!
}()
//#4
lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
let coordinator = NSPersistentStoreCoordinator(managedObjectModel:
self.managedObjectModel)
let url = self.libraryDirectory.appendingPathComponent("spark.sqlite")
do {
try coordinator.addPersistentStore(ofType:
NSSQLiteStoreType,
configurationName: nil,
at: url,
options: [
NSMigratePersistentStoresAutomaticallyOption: true,
NSInferMappingModelAutomaticallyOption: true
]
)
} catch {
// Report any error we got.
NSLog("CoreData error \(error), \(error._userInfo)")
self.errorHandler(error)
}
return coordinator
}()
//#5
lazy var backgroundManagedObjectContext: NSManagedObjectContext = {
let coordinator = self.persistentStoreCoordinator
var privateManagedObjectContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
privateManagedObjectContext.persistentStoreCoordinator = coordinator
return privateManagedObjectContext
}()
//#6
lazy var managedObjectContext: NSManagedObjectContext = {
let coordinator = self.persistentStoreCoordinator
var mainManagedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
mainManagedObjectContext.persistentStoreCoordinator = coordinator
return mainManagedObjectContext
}()
//#7
@objc func mainContextChanged(notification: NSNotification) {
backgroundManagedObjectContext.perform { [unowned self] in
self.backgroundManagedObjectContext.mergeChanges(fromContextDidSave: notification as Notification)
}
}
@objc func bgContextChanged(notification: NSNotification) {
managedObjectContext.perform{ [unowned self] in
self.managedObjectContext.mergeChanges(fromContextDidSave: notification as Notification)
}
}
}
struct CoreDataServiceConsts {
static let applicationGroupIdentifier = "group.zz.zz.zz"//example
}
final class PersistentContainer: NSPersistentContainer {
internal override class func defaultDirectoryURL() -> URL {
var url = super.defaultDirectoryURL()
if let newURL =
FileManager.default.containerURL(
forSecurityApplicationGroupIdentifier: CoreDataServiceConsts.applicationGroupIdentifier) {
url = newURL
}
return url
}
我可以在今天的扩展中使用核心数据!但是,实体是空的。 我测试的代码每一个都没关系。没有错误(因为我保存了一些数据用于测试,我完全正常工作。) 我真的不知道这个问题。 是关于xcode的问题吗?
答案 0 :(得分:0)
您不必将NSPersistentContainer
子类设置为能够设置自定义商店目录。
class CoreDataStack {
public private(set) var persistentContainer: NSPersistentContainer
public init(withManagedObjectModelName momdName:String, sqliteStoreName storeName:String, storeBaseUrl baseUrl:URL?) {
guard let modelURL = Bundle(for: type(of: self)).url(forResource: momdName, withExtension:"momd") else {
fatalError("Error loading model from bundle")
}
guard let mom = NSManagedObjectModel(contentsOf: modelURL) else {
fatalError("Error initializing mom from: \(modelURL)")
}
persistentContainer = NSPersistentContainer(name: momdName, managedObjectModel: mom)
// If a base URL is given, use it. Else use persistent stores default
if let baseUrl = baseUrl {
var storeUrl = baseUrl.appendingPathComponent(momdName)
storeUrl = storeUrl.appendingPathExtension("sqlite")
let description = NSPersistentStoreDescription(url: storeUrl)
persistentContainer.persistentStoreDescriptions = [description]
}
persistentContainer.loadPersistentStores() { (storeDescription, error) in
if let error = error {
fatalError("Unresolved error \(error)")
}
}
}
// MARK: - ... save, get context and others ...
}
使用您的App Group目录实例化它:
guard let groupURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: applicationGroupId) else {
fatalError("could not get shared app group directory.")
}
let modelName = "Model"
let storeName = "store"
let myStore = CoreDataStack(withManagedObjectModelName: modelName, sqliteStoreName: storeName, storeBaseUrl: groupURL)
答案 1 :(得分:0)
尝试创建一个新的“Cocoa Touch Framework”并将xcdatamodeld文件和自定义托管对象类放在那里,这样您就可以在应用程序和扩展程序之间共享它们。
然后继承NSPersistentContainer。
class SparkPersistentContainer: NSPersistentContainer = {
override class func defaultDirectoryURL() -> URL {
return FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.example.your-app")!
init() {
let modelURL = Bundle(for: CustomManagedObject.self).url(forResource: "Spark", withExtension: "momd")!
let model = NSManagedObjectModel(contentsOf: modelURL)!
super.init(name: "Spark", managedObjectModel: model)
}
}