我一直在尝试使用Core Data和iCloud在两个iDevices之间同步数据，已经几周了。苹果公司的2012/2013年的文档是用Objective-C编写的，并不是很详细。
我试图将其转换为适用于iOS9的Swift 2.0。一开始我以为已经完成了，两个设备共享数据并同步任何更改。然后事情变得混乱起来，之前已被删除的数据重新出现，而唯一同步的方法是重新启动应用程序。现在我遇到了这个错误：
CoreData：Ubiquity：管理员返回了一个启动下载的严重错误 错误域=BRCloudDocsErrorDomain Code=6 "Path is outside of any CloudDocs container, will never sync"
如果我通过Xcode（7）持续运行应用程序，它似乎会自行修复并同步更改，但这对于真实世界并不理想；用户不应该强制退出应用程序并重新启动才能进行同步，如果数据损坏则需要重新安装应用程序。
有人知道我可能做错了什么，以及为什么会发生这个错误吗？
完整的错误信息：
2015-09-08 22:21:53.679 APPNAME[5550:407392] - [PFUbiquitySwitchboardEntryMetadata setUseLocalStorage:](874): CoreData: Ubiquity: nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B:APPNAMEStore
Using local storage: 1 for new NSFileManager current token <766b5e5c 3c205110 52c05248 38a47bd9 aca1ee87>
2015-09-08 22:21:57.639 APPNAME[5550:407392] storesDidChange posting notif
2015-09-08 22:21:57.639 APPNAME[5550:407452] -[PFUbiquitySwitchboardEntryMetadata setUseLocalStorage:](874): CoreData: Ubiquity: nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B:APPNAMEStore
Using local storage: 0 for new NSFileManager current token <766b5e5c 3c205110 52c05248 38a47bd9 aca1ee87>
2015-09-08 22:21:58.565 APPNAME[5550:407476] __45-[PFUbiquityFilePresenter processPendingURLs]_block_invoke(447): CoreData: Ubiquity: Librarian returned a serious error for starting downloads Error Domain=BRCloudDocsErrorDomain Code=6 "Path is outside of any CloudDocs container, will never sync" UserInfo={NSDescription=Path is outside of any CloudDocs container, will never sync, NSFilePath=/Users/USER/Library/Developer/CoreSimulator/Devices/19DE5FBA-9248-410D-9264-6B434B30F8CA/data/Containers/Data/Application/D00DA341-E9A5-4C65-82B4-41EFC5638ED3/Documents/CoreDataUbiquitySupport/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/DD2F75D5-FEAF-482A-A896-657936AFCFCD/container/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/NiGeopr_A~01pLnJTYkIei3RCNWt5FiSp0~iJS1V9eo=/38201B1B-7F78-4683-8604-D8F79D1F895B.1.cdt} with userInfo {
NSDescription = "Path is outside of any CloudDocs container, will never sync";
NSFilePath = "/Users/USER/Library/Developer/CoreSimulator/Devices/19DE5FBA-9248-410D-9264-6B434B30F8CA/data/Containers/Data/Application/D00DA341-E9A5-4C65-82B4-41EFC5638ED3/Documents/CoreDataUbiquitySupport/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/DD2F75D5-FEAF-482A-A896-657936AFCFCD/container/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/NiGeopr_A~01pLnJTYkIei3RCNWt5FiSp0~iJS1V9eo=/38201B1B-7F78-4683-8604-D8F79D1F895B.1.cdt";
} for these urls: {(
file:///Users/USER/Library/Developer/CoreSimulator/Devices/19DE5FBA-9248-410D-9264-6B434B30F8CA/data/Containers/Data/Application/D00DA341-E9A5-4C65-82B4-41EFC5638ED3/Documents/CoreDataUbiquitySupport/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/DD2F75D5-FEAF-482A-A896-657936AFCFCD/container/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/NiGeopr_A~01pLnJTYkIei3RCNWt5FiSp0~iJS1V9eo=/38201B1B-7F78-4683-8604-D8F79D1F895B.1.cdt
)}
2015-09-08 22:21:58.566 APPNAME[5550:407452] __45-[PFUbiquityFilePresenter processPendingURLs]_block_invoke(447): CoreData: Ubiquity: Librarian returned a serious error for starting downloads Error Domain=BRCloudDocsErrorDomain Code=6 "Path is outside of any CloudDocs container, will never sync" UserInfo={NSDescription=Path is outside of any CloudDocs container, will never sync, NSFilePath=/Users/USER/Library/Developer/CoreSimulator/Devices/19DE5FBA-9248-410D-9264-6B434B30F8CA/data/Containers/Data/Application/D00DA341-E9A5-4C65-82B4-41EFC5638ED3/Documents/CoreDataUbiquitySupport/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/DD2F75D5-FEAF-482A-A896-657936AFCFCD/container/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/NiGeopr_A~01pLnJTYkIei3RCNWt5FiSp0~iJS1V9eo=/09F9706A-4479-47BF-B26D-DEBF92C55E48.1.cdt} with userInfo {
NSDescription = "Path is outside of any CloudDocs container, will never sync";
NSFilePath = "/Users/USER/Library/Developer/CoreSimulator/Devices/19DE5FBA-9248-410D-9264-6B434B30F8CA/data/Containers/Data/Application/D00DA341-E9A5-4C65-82B4-41EFC5638ED3/Documents/CoreDataUbiquitySupport/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/DD2F75D5-FEAF-482A-A896-657936AFCFCD/container/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/NiGeopr_A~01pLnJTYkIei3RCNWt5FiSp0~iJS1V9eo=/09F9706A-4479-47BF-B26D-DEBF92C55E48.1.cdt";
} for these urls: {(
file:///Users/USER/Library/Developer/CoreSimulator/Devices/19DE5FBA-9248-410D-9264-6B434B30F8CA/data/Containers/Data/Application/D00DA341-E9A5-4C65-82B4-41EFC5638ED3/Documents/CoreDataUbiquitySupport/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/DD2F75D5-FEAF-482A-A896-657936AFCFCD/container/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/NiGeopr_A~01pLnJTYkIei3RCNWt5FiSp0~iJS1V9eo=/09F9706A-4479-47BF-B26D-DEBF92C55E48.1.cdt,
file:///Users/USER/Library/Developer/CoreSimulator/Devices/19DE5FBA-9248-410D-9264-6B434B30F8CA/data/Containers/Data/Application/D00DA341-E9A5-4C65-82B4-41EFC5638ED3/Documents/CoreDataUbiquitySupport/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/DD2F75D5-FEAF-482A-A896-657936AFCFCD/container/nobody~sim73E13D94-AB95-59FB-AF18-ADC7BC05B47B/APPNAMEStore/NiGeopr_A~01pLnJTYkIei3RCNWt5FiSp0~iJS1V9eo=/8DACD654-5C84-4699-B512-078D46E51947.1.cdt
)}
2015-09-08 22:22:02.865 APPNAME[5550:407497] mergeChanges notif:NSConcreteNotification 0x7fc53c926e80 {name = com.apple.coredata.ubiquity.importer.didfinishimport; object = <NSPersistentStoreCoordinator: 0x7fc53ae36700>; userInfo = {
deleted = "{(\n)}";
inserted = "{(\n)}";
updated = "{(\n)}";
}}
iCloud 的 Core Data 栈
// MARK: - Core Data stack
// This handles the updates to the data via iCLoud updates
func registerCoordinatorForStoreNotifications (coordinator : NSPersistentStoreCoordinator) {
let nc : NSNotificationCenter = NSNotificationCenter.defaultCenter();
nc.addObserver(self, selector: "StoresWillChange:",
name: NSPersistentStoreCoordinatorStoresWillChangeNotification,
object: coordinator)
nc.addObserver(self, selector: "StoresDidChange:",
name: NSPersistentStoreCoordinatorStoresDidChangeNotification,
object: coordinator)
nc.addObserver(self, selector: "StoreChangedUbiquitousContent:",
name: NSPersistentStoreDidImportUbiquitousContentChangesNotification,
object: coordinator)
}
// Subscribe to NSPersistentStoreCoordinatorStoresWillChangeNotification
// most likely to be called if the user enables / disables iCloud
// (either globally, or just for your app) or if the user changes
// iCloud accounts.
func StoresWillChange (notification:NSNotification) {
managedObjectContext.performBlock { () -> Void in
if self.managedObjectContext.hasChanges {
do {
try self.managedObjectContext.save()
} catch {
print("error saving Managed Object Context in AppDelegate")
}
} else{
// drop any manged object refrences
self.managedObjectContext.reset()
}
}
}
// Subscribe to NSPersistentStoreCoordinatorStoresDidChangeNotification
func StoresDidChange(notification: NSNotification) {
// here is when you can refresh your UI and
// load new data from the new store
NSLog("storesDidChange posting notif");
NSNotificationCenter.defaultCenter().postNotificationName("storeDidChange", object: nil)
}
func mergeChanges(notification: NSNotification) {
NSLog("mergeChanges notif:\(notification)")
self.managedObjectContext.performBlock {
self.managedObjectContext.mergeChangesFromContextDidSaveNotification(notification)
}
}
func StoreChangedUbiquitousContent(notification: NSNotification) {
self.mergeChanges(notification);
}
lazy var applicationDocumentsDirectory: NSURL = {
// The directory the application uses to store the Core Data store file. This code uses a directory named "com.USER.swift2-iCloud" in the application's documents Application Support directory.
let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
return urls[urls.count-1]
}()
lazy var managedObjectModel: NSManagedObjectModel = {
let modelURL = NSBundle.mainBundle().URLForResource("APPNAME", withExtension: "momd")!
return NSManagedObjectModel(contentsOfURL: modelURL)!
}()
lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
// Create the coordinator and store
var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("APPNAME.sqlite")
var error: NSError? = nil
var failureReason = "There was an error creating or loading the application's saved data."
// iCloud store
var storeOptions = [NSPersistentStoreUbiquitousContentNameKey : "APPNAMEStore",NSMigratePersistentStoresAutomaticallyOption: true,
NSInferMappingModelAutomaticallyOption: true]
do {
try coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: NSURL.fileURLWithPath(url.path!), options: storeOptions)
} catch var error1 as NSError {
error = error1
coordinator = nil
// 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
error = 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 \(error), \(error!.userInfo)")
abort()
} catch {
fatalError()
}
self.registerCoordinatorForStoreNotifications (coordinator!)
return coordinator
}()