问题
The book states,
“An ensemble identifier is used to match stores across devices. It is important that this be the same for each store in the ensemble.”
let ensembleFileSystem = CDEICloudFileSystem(ubiquityContainerIdentifier: "???")
Does this need to be unique for all users ? or just for my application?
If anyone has a Swift version of how the set up Ensembles that would be great.
What I have so far, is this all that is needed?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let ensembleFileSystem = CDEICloudFileSystem(ubiquityContainerIdentifier: "???")
let modelURL = NSBundle.mainBundle().URLForResource("DataModel", withExtension: "momd")!
let url = applicationDocumentsDirectory.URLByAppendingPathComponent("SingleViewCoreData.sqlite")
let ensemble = CDEPersistentStoreEnsemble(ensembleIdentifier: "mainstore", persistentStoreURL: url, managedObjectModelURL: modelURL, cloudFileSystem: ensembleFileSystem!)
if !ensemble.leeched {
ensemble.leechPersistentStoreWithCompletion { (error) -> Void in
if error != nil {
print("cannot leech")
print(error!.localizedDescription)
}
}
}
NSNotificationCenter.defaultCenter().addObserver(self, selector: "syncWithCompletion:", name: CDEMonitoredManagedObjectContextDidSaveNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "syncWithCompletion:", name: CDEICloudFileSystemDidDownloadFilesNotification, object: nil)
return true
}
func syncWithCompletion(notification:NSNotification) {
print("synced \(notification)")
managedObjectContext.mergeChangesFromContextDidSaveNotification(notification)
}
Something is missing Im getting this error log
User is not logged into iCloud
Despite being logged in as evident
print(NSFileManager.defaultManager().ubiquityIdentityToken)
Not being nil
回答1:
Got it to work in the end - found example apps in 1.0 Git
I belive I was leeching to fast - not giving enough time for the set up process to complete.
Support this framework - buy ensembles 2, if you like ver 1.
Update .. easier way
I just use the normal core data stack apple provides.
Here is the extras to get ensembles working.
var ensemble:CDEPersistentStoreEnsemble!
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let file = CDEICloudFileSystem(ubiquityContainerIdentifier: nil)
let modelURL = NSBundle.mainBundle().URLForResource("DataModel", withExtension: "momd")!
let storeurl = self.applicationDocumentsDirectory.URLByAppendingPathComponent("store.sqlite")
ensemble = CDEPersistentStoreEnsemble(ensembleIdentifier: "MyStoreName", persistentStoreURL: storeurl, managedObjectModelURL: modelURL, cloudFileSystem: file)
ensemble.delegate = self
NSNotificationCenter.defaultCenter().addObserver(self, selector: "localSaveOccurred:", name: CDEMonitoredManagedObjectContextDidSaveNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "cloudDataDidDownload:", name: CDEICloudFileSystemDidDownloadFilesNotification, object: nil)
syncWithCompletion { completed in
if completed {
print("SUCCESSS")
}
else {
print("FAIL")
}
}
return true
}
// MARK: - Sync
func applicationDidEnterBackground(application: UIApplication) {
print("Did Enter Background Save from App Delegate")
let identifier = UIApplication.sharedApplication().beginBackgroundTaskWithExpirationHandler(nil)
saveContext()
syncWithCompletion { (completed) -> Void in
if completed {
UIApplication.sharedApplication().endBackgroundTask(identifier)
}
}
}
func applicationWillEnterForeground(application: UIApplication) {
syncWithCompletion { (completed) -> Void in
}
}
func localSaveOccurred(note:NSNotification) {
syncWithCompletion { (completed) -> Void in
}
}
func cloudDataDidDownload(note:NSNotification) {
syncWithCompletion { (completed) -> Void in
print("items from iCloud arrived")
}
}
func syncWithCompletion(completion:(completed:Bool) -> Void) {
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
if !ensemble.leeched {
ensemble.leechPersistentStoreWithCompletion(nil)
}
else {
ensemble.mergeWithCompletion{ error in
if error != nil {
print("cannot merge \(error!.localizedDescription)")
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
completion(completed: false)
}
else {
print("merged")
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
completion(completed: true)
}
}
}
}
// MARK: - Ensemble Delegate Methods
func persistentStoreEnsemble(ensemble: CDEPersistentStoreEnsemble!, didSaveMergeChangesWithNotification notification: NSNotification!) {
managedObjectContext.performBlockAndWait { () -> Void in
self.managedObjectContext.mergeChangesFromContextDidSaveNotification(notification)
}
}
func persistentStoreEnsemble(ensemble: CDEPersistentStoreEnsemble!, globalIdentifiersForManagedObjects objects: [AnyObject]!) -> [AnyObject]! {
return (objects as NSArray).valueForKeyPath("uniqueIdentifier") as! [AnyObject]
}
My First Way
Here it is in Swift, with a few extras
var ensemble:CDEPersistentStoreEnsemble!
var cloudFileSystem:CDEICloudFileSystem!
var managedObjectContext: NSManagedObjectContext!
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
setUpCoreData()
let modelURL = NSBundle.mainBundle().URLForResource("YourDataModel", withExtension: "momd")!
cloudFileSystem = CDEICloudFileSystem(ubiquityContainerIdentifier:"USE_YOUR_APPS_REVERSE DOMAIN NAME HERE")
From the developer: RE ubiquityContainerIdentifier
This is not part of Ensembles per se. It is from iCloud. Every app using iCloud has to have a ubiquity container id. You can find it in your app settings when you enable iCloud. It is unique per app, and we only use it if you are choosing for iCloud (eg not Dropbox).
ensemble = CDEPersistentStoreEnsemble(ensembleIdentifier: "store", persistentStoreURL: storeURL(), managedObjectModelURL: modelURL, cloudFileSystem: cloudFileSystem!)
ensemble.delegate = self
NSNotificationCenter.defaultCenter().addObserver(self, selector: "localSaveOccurred:", name: CDEMonitoredManagedObjectContextDidSaveNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "cloudDataDidDownload:", name: CDEICloudFileSystemDidDownloadFilesNotification, object: nil)
syncWithCompletion { completed in
if completed {
print("SUCCESSS")
}
else {
print("FAIL")
}
}
return true
}
// MARK: - Core Data Stack
func setUpCoreData() {
let modelURL = NSBundle.mainBundle().URLForResource("DataModel", withExtension: "momd")!
guard let model = NSManagedObjectModel(contentsOfURL: modelURL) else { fatalError("cannot use model") }
do {
try NSFileManager.defaultManager().createDirectoryAtURL(storeDirectoryURL(), withIntermediateDirectories: true, attributes: nil)
}
catch {
fatalError("cannot create dir")
}
let coordinator = NSPersistentStoreCoordinator(managedObjectModel: model)
//NSDictionary *options = @{NSMigratePersistentStoresAutomaticallyOption: @YES, NSInferMappingModelAutomaticallyOption: @YES};
let failureReason = "There was an error creating or loading the application's saved data."
do {
try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: storeURL(), options: nil)
managedObjectContext = NSManagedObjectContext.init(concurrencyType: .MainQueueConcurrencyType)
managedObjectContext.persistentStoreCoordinator = coordinator
managedObjectContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
} 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()
}
}
func storeDirectoryURL() -> NSURL {
let directoryURL = try! NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
return directoryURL
}
func storeURL() -> NSURL {
let url = storeDirectoryURL().URLByAppendingPathComponent("store.sqlite")
return url
}
// MARK: - Sync
func applicationDidEnterBackground(application: UIApplication) {
print("Did Enter Background Save from App Delegate")
let identifier = UIApplication.sharedApplication().beginBackgroundTaskWithExpirationHandler(nil)
saveContext()
syncWithCompletion { (completed) -> Void in
if completed {
UIApplication.sharedApplication().endBackgroundTask(identifier)
}
}
}
func applicationWillEnterForeground(application: UIApplication) {
syncWithCompletion { (completed) -> Void in
}
}
func localSaveOccurred(note:NSNotification) {
syncWithCompletion { (completed) -> Void in
}
}
func cloudDataDidDownload(note:NSNotification) {
syncWithCompletion { (completed) -> Void in
}
}
func syncWithCompletion(completion:(completed:Bool) -> Void) {
if !ensemble.leeched {
ensemble.leechPersistentStoreWithCompletion { error in
if error != nil {
print("cannot leech \(error!.localizedDescription)")
completion(completed: false)
}
else {
print("leached!!")
completion(completed: true)
}
}
}
else {
ensemble.mergeWithCompletion{ error in
if error != nil {
print("cannot merge \(error!.localizedDescription)")
completion(completed: false)
}
else {
print("merged!!")
completion(completed: true)
}
}
}
}
// MARK: - Ensemble Delegate Methods
func persistentStoreEnsemble(ensemble: CDEPersistentStoreEnsemble!, didSaveMergeChangesWithNotification notification: NSNotification!) {
print("did merge changes with note")
managedObjectContext.mergeChangesFromContextDidSaveNotification(notification)
}
func persistentStoreEnsemble(ensemble: CDEPersistentStoreEnsemble!, globalIdentifiersForManagedObjects objects: [AnyObject]!) -> [AnyObject]! {
return (objects as NSArray).valueForKeyPath("uniqueIdentifier") as! [AnyObject]
}
来源：https://stackoverflow.com/questions/33204120/swift-ensembles-set-up-ubiquitycontaineridentifier