我希望实现的目标是，当用户在“持久存储”上创建、更改或删除数据时，它将与“iCloud存储”同步，然后更新其他登录到相同iCloud账户的设备。我已经使用Objective-C资源创建了一个“Core Data Stack”，并尝试使用Swift编写自己的代码，但是我在使用两个登录到相同iCloud账户的设备同步数据时遇到了问题。
例如，当“iDevice A”登录到iCloud时，它会将数据备份到iCloud，但是当“iDevice B”登录到iCloud时，应用程序会删除持久存储中已有的任何数据以保存iCloud备份，并且存储设备之间的任何更改不会出现在其他设备上，但似乎保存到了iCloud存储作为最新备份，因此如果该应用程序被删除并重新安装，则会看到由另一台设备制作的最新备份 - 请注意，如果“iDevice B”已经登录，则不会使用“iDevice A”的数据，除非重新安装了应用程序并由其他设备进行了最后备份。
有人知道我在“Core data stack”中的哪里出错了，无法同步使用同一iCloud账户的两个设备之间的数据吗？ Core Data Stack:
例如，当“iDevice A”登录到iCloud时，它会将数据备份到iCloud，但是当“iDevice B”登录到iCloud时，应用程序会删除持久存储中已有的任何数据以保存iCloud备份，并且存储设备之间的任何更改不会出现在其他设备上，但似乎保存到了iCloud存储作为最新备份，因此如果该应用程序被删除并重新安装，则会看到由另一台设备制作的最新备份 - 请注意，如果“iDevice B”已经登录，则不会使用“iDevice A”的数据，除非重新安装了应用程序并由其他设备进行了最后备份。
有人知道我在“Core data stack”中的哪里出错了，无法同步使用同一iCloud账户的两个设备之间的数据吗？ Core Data Stack:
// MARK: - Core Data stack
// All the following code is in my appDelgate Core data stack
func observeCloudActions(persistentStoreCoordinator psc: NSPersistentStoreCoordinator?) {
// Register iCloud notifications observers for;
//Stores Will change
//Stores Did Change
//persistentStoreDidImportUbiquitousContentChanges
//mergeChanges
}
//Functions for notifications
func mergeChanges(notification: NSNotification) {
NSLog("mergeChanges notif:\(notification)")
if let moc = managedObjectContext {
moc.performBlock {
moc.mergeChangesFromContextDidSaveNotification(notification)
self.postRefetchDatabaseNotification()
}
}
}
func persistentStoreDidImportUbiquitousContentChanges(notification: NSNotification) {
self.mergeChanges(notification);
}
func storesWillChange(notification: NSNotification) {
NSLog("storesWillChange notif:\(notification)");
if let moc = self.managedObjectContext {
moc.performBlockAndWait {
var error: NSError? = nil;
if moc.hasChanges && !moc.save(&error) {
NSLog("Save error: \(error)");
} else {
// drop any managed objects
}
moc.reset();
}
NSNotificationCenter.defaultCenter().postNotificationName("storeWillChange", object: nil)
}
}
func storesDidChange(notification: NSNotification) {
NSLog("storesDidChange posting notif");
self.postRefetchDatabaseNotification();
//Sends notification to view controllers to reload data NSNotificationCenter.defaultCenter().postNotificationName("storeDidChange", object: nil)
}
func postRefetchDatabaseNotification() {
dispatch_async(dispatch_get_main_queue(), { () -> Void in
NSNotificationCenter.defaultCenter().postNotificationName("storeDidChange", object: nil)
})
}
// Core data stack
lazy var applicationDocumentsDirectory: NSURL = {
// The directory the application uses to store the Core Data store file. This code uses a directory named "hyouuu.pendo" in the application's documents Application Support directory.
let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
return urls[urls.count-1] as! NSURL
}()
lazy var managedObjectModel: NSManagedObjectModel = {
// The managed object model for the application. This property is not optional. It is a fatal error for the application not to be able to find and load its model.
let modelURL = NSBundle.mainBundle().URLForResource("AppName", withExtension: "momd")!
NSLog("modelURL:\(modelURL)")
return NSManagedObjectModel(contentsOfURL: modelURL)!
}()
lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
// The persistent store coordinator for the application. This implementation creates and return a coordinator, having added 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.
// Create the coordinator and store
var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
let documentsDirectory = NSFileManager.defaultManager().URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask).last as! NSURL
let storeURL = documentsDirectory.URLByAppendingPathComponent("CoreData.sqlite")
NSLog("storeURL:\(storeURL)")
let storeOptions = [NSPersistentStoreUbiquitousContentNameKey:"AppStore"]
var error: NSError? = nil
var failureReason = "There was an error creating or loading the application's saved data."
if coordinator!.addPersistentStoreWithType(
NSSQLiteStoreType,
configuration: nil,
URL: storeURL,
options: storeOptions,
error: &error) == nil
{
coordinator = nil
// Report any error we got.
let dict = NSMutableDictionary()
dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
dict[NSLocalizedFailureReasonErrorKey] = failureReason
dict[NSUnderlyingErrorKey] = error
error = NSError(domain: "Pendo_Error_Domain", code: 9999, userInfo: dict as [NSObject : AnyObject])
// 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("AddPersistentStore error \(error), \(error!.userInfo)")
}
self.observeCloudActions(persistentStoreCoordinator: coordinator)
return coordinator
}()
lazy var managedObjectContext: NSManagedObjectContext? = {
// Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.) This property is optional since there are legitimate error conditions that could cause the creation of the context to fail.
let coordinator = self.persistentStoreCoordinator
if coordinator == nil {
return nil
}
var managedObjectContext = NSManagedObjectContext(concurrencyType: NSManagedObjectContextConcurrencyType.MainQueueConcurrencyType)
managedObjectContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
managedObjectContext.persistentStoreCoordinator = coordinator
return managedObjectContext
}()
