I have an application for OSX and iOS and both use iCloud for sharing core data between them. When I make changes in the iPhone I can see them at OSX app and the NSPersistentStoreDidImportUbiquitousContentChangesNotification is called at both apps, so the iOS -> Mac works well. But when I make some changes at Mac app I cant see them in the iPhone. The iPhone never calls the NSPersistentStoreDidImportUbiquitousContentChangesNotification. The only way I can get the Mac changes is making some change at iPhone. Then I can see all changes.
iCloud integration in both projects is the same. The core data datamodel is the same. The entitlements are both the same too.
All my code is based on this library: http://ossh.com.au/design-and-technology/software-development/sample-library-style-ios-core-data-app-with-icloud-integration/
Why is the iPhone not getting Mac changes until I make some change at iPhone? Any ideas?
Another question
In my app when the user enables iCloud I check if is already a file at iCloud. If file exists the user can select to restore core data from the iCloud file or start new copy from the local store. To start a new copy I use this code:
- (void)startNewCopy
{
[self removeICloudStore];
[self moveStoreToIcloud];
}
- (void)removeICloudStore
{
BOOL result;
NSError *error;
// Now delete the iCloud content and file
result = [NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:[self icloudStoreURL]
options:[self icloudStoreOptions]
error:&error];
if (!result)
{
NSLog(@"Error removing store");
}
else
{
NSLog(@"Core Data store removed.");
// Now delete the local file
[self deleteLocalCopyOfiCloudStore];
}
}
- (void)deleteLocalCopyOfiCloudStore {
// We need to get the URL to the store
NSError *error = nil;
[[NSFileManager defaultManager] removeItemAtURL:[self localUbiquitySupportURL] error:&error];
}
- (void)moveStoreToIcloud
{
// Open the store
NSPersistentStore *sourceStore = [[_persistentStoreCoordinator persistentStores] firstObject];
if (!sourceStore)
{
NSLog(@" failed to add old store");
}
else
{
NSLog(@" Successfully added store to migrate");
NSError *error;
id migrationSuccess = [_persistentStoreCoordinator migratePersistentStore:sourceStore toURL:[self icloudStoreURL] options:[self icloudStoreOptions] withType:NSSQLiteStoreType error:&error];
if (migrationSuccess)
{
NSLog(@"Store migrated to iCloud");
_persistentStoreCoordinator = nil;
_managedObjectContext = nil;
// Now delete the local file
[self deleteLocalStore];
}
else
{
NSLog(@"Failed to migrate store: %@, %@", error, error.userInfo);
}
}
}
- (void)deleteLocalStore
{
NSError *error = nil;
[[NSFileManager defaultManager] removeItemAtURL:[self localStoreURL] error:&error];
}
Doing this from a single device all seems to work well, but when I try this with multiple devices I am getting some errors.
Example:
I have two devices. The first one is not connected to iCloud and the second is connected to iCloud.
In the first device when I enable iCloud I choose startNewCopy and then in the second device I get this error:
CoreData: Ubiquity: Librarian returned a serious error for starting downloads Error Domain=BRCloudDocsErrorDomain Code=5 "The operation couldn’t be completed. (BRCloudDocsErrorDomain error 5 - No document at URL)"
The NSPersistentStoreCoordinatorStoresDidChangeNotification is never called before the error.
This is my code for the notification:
- (void)processStoresDidChange:(NSNotification *)notification
{
NSLog(@"processStoresDidChange");
// Post notification to trigger UI updates
// Check type of transition
NSNumber *type = [notification.userInfo objectForKey:NSPersistentStoreUbiquitousTransitionTypeKey];
//NSLog(@" userInfo is %@", notification.userInfo);
//NSLog(@" transition type is %@", type);
if (type.intValue == NSPersistentStoreUbiquitousTransitionTypeInitialImportCompleted) {
NSLog(@" transition type is NSPersistentStoreUbiquitousTransitionTypeInitialImportCompleted");
} else if (type.intValue == NSPersistentStoreUbiquitousTransitionTypeAccountAdded) {
NSLog(@" transition type is NSPersistentStoreUbiquitousTransitionTypeAccountAdded");
} else if (type.intValue == NSPersistentStoreUbiquitousTransitionTypeAccountRemoved) {
NSLog(@" transition type is NSPersistentStoreUbiquitousTransitionTypeAccountRemoved");
} else if (type.intValue == NSPersistentStoreUbiquitousTransitionTypeContentRemoved) {
NSLog(@" transition type is NSPersistentStoreUbiquitousTransitionTypeContentRemoved");
}
[[NSOperationQueue mainQueue] addOperationWithBlock:^ {
if (type.intValue == NSPersistentStoreUbiquitousTransitionTypeContentRemoved) {
[self deleteLocalStore];
_persistentStoreCoordinator = nil;
_managedObjectContext = nil;
NSLog(@" iCloud store was removed! Wait for empty store");
}
// Refresh user Interface
[[NSNotificationCenter defaultCenter] postNotificationName:@"notiIcloud" object:@"storeChanged"];
}];
}
How can I detect that the iCloud content has been removed and avoid getting the error above?
