Question

我在我的iOS应用程序中启用了iCloud，在第一次启动应用程序时，当我按下应用程序中的任何视图时，应用程序冻结了大约5秒钟。我按照this教程在我的应用程序中启用了iCloud，并使用核心数据同步数据。在添加iCloud同步之前我没有遇到此问题。这仅在首次启动时发生，而不是在应用程序的其他启动时发生。 iCloud同步确实发生了。问题是app冻结了。

以下是管理我的app delegate中同步的代码。

- (NSURL *)applicationDocumentsDirectory
{
    return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
    /*if (persistentStoreCoordinator == nil) {
        NSURL *storeURL = [NSURL fileURLWithPath:[self dataStorePath]];

        persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.managedObjectModel];

        NSError *error;
        if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
            NSLog(@"Error adding persistent store %@, %@", error, [error userInfo]);
            abort();
        }
    }
    return persistentStoreCoordinator;*/

    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

    if ((persistentStoreCoordinator != nil)) {
        return persistentStoreCoordinator;
    }

    persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    NSPersistentStoreCoordinator *psc = persistentStoreCoordinator;

    // Set up iCloud in another thread:

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        // ** Note: if you adapt this code for your own use, you MUST change this variable:
        NSString *iCloudEnabledAppID = @"48S27G4A2S.com.maxned.iDownloadBlog";

        // ** Note: if you adapt this code for your own use, you should change this variable:
        NSString *dataFileName = @"DataStore.sqlite";

        // ** Note: For basic usage you shouldn't need to change anything else

        NSString *iCloudDataDirectoryName = @"Data.nosync";
        NSString *iCloudLogsDirectoryName = @"Logs";
        NSFileManager *fileManager = [NSFileManager defaultManager];
        NSURL *localStore = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:dataFileName];
        NSURL *iCloud = [fileManager URLForUbiquityContainerIdentifier:nil];

        if (iCloud)
        {
            //NSLog(@"iCloud is working");

            NSURL *iCloudLogsPath = [NSURL fileURLWithPath:[[iCloud path] stringByAppendingPathComponent:iCloudLogsDirectoryName]];

            /*NSLog(@"iCloudEnabledAppID = %@",iCloudEnabledAppID);
            NSLog(@"dataFileName = %@", dataFileName);
            NSLog(@"iCloudDataDirectoryName = %@", iCloudDataDirectoryName);
            NSLog(@"iCloudLogsDirectoryName = %@", iCloudLogsDirectoryName);
            NSLog(@"iCloud = %@", iCloud);
            NSLog(@"iCloudLogsPath = %@", iCloudLogsPath);*/

            if ([fileManager fileExistsAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]] == NO) {
                NSError *fileSystemError;
                [fileManager createDirectoryAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]
                       withIntermediateDirectories:YES
                                        attributes:nil
                                             error:&fileSystemError];

                if (fileSystemError != nil) {
                    NSLog(@"Error creating database directory %@", fileSystemError);
                }
            }

            NSString *iCloudData = [[[iCloud path]
                                     stringByAppendingPathComponent:iCloudDataDirectoryName]
                                    stringByAppendingPathComponent:dataFileName];

            //NSLog(@"iCloudData = %@", iCloudData);

            NSMutableDictionary *options = [NSMutableDictionary dictionary];
            [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
            [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
            [options setObject:iCloudEnabledAppID forKey:NSPersistentStoreUbiquitousContentNameKey];
            [options setObject:iCloudLogsPath forKey:NSPersistentStoreUbiquitousContentURLKey];

            [psc lock];

            [psc addPersistentStoreWithType:NSSQLiteStoreType
                configuration:nil
                URL:[NSURL fileURLWithPath:iCloudData]
                options:options
                error:nil];

            [psc unlock];

        } else {

            NSLog(@"iCloud is NOT working - using a local store");
            NSMutableDictionary *options = [NSMutableDictionary dictionary];
            [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
            [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];

            [psc lock];

            [psc addPersistentStoreWithType:NSSQLiteStoreType
                configuration:nil
                URL:localStore
                options:options
                error:nil];

            [psc unlock];

        }

        dispatch_async(dispatch_get_main_queue(), ^{
            [[NSNotificationCenter defaultCenter] postNotificationName:@"SomethingChanged" object:self userInfo:nil];
        });
    });

    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

    return persistentStoreCoordinator;
}

/*- (NSManagedObjectContext *)managedObjectContext
{
    if (managedObjectContext == nil) {
        NSPersistentStoreCoordinator *coordinator = self.persistentStoreCoordinator;
        if (coordinator != nil) {
            managedObjectContext = [[NSManagedObjectContext alloc] init];
            [managedObjectContext setPersistentStoreCoordinator:coordinator];
        }
    }
    return managedObjectContext;
}*/

- (NSManagedObjectContext *)managedObjectContext
{
    if (managedObjectContext != nil) {
        return managedObjectContext;
    }

    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];

    if (coordinator != nil) {
        NSManagedObjectContext *moc = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];

        [moc performBlockAndWait:^{
            [moc setPersistentStoreCoordinator: coordinator];
            [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(mergeChangesFrom_iCloud:) name:NSPersistentStoreDidImportUbiquitousContentChangesNotification object:coordinator];
        }];
        managedObjectContext = moc;
    }

    return managedObjectContext;
}

- (void)mergeChangesFrom_iCloud:(NSNotification *)notification
{
    //NSLog(@"Merging in changes from iCloud...");

    NSManagedObjectContext* moc = [self managedObjectContext];

    [moc performBlock:^{

        [moc mergeChangesFromContextDidSaveNotification:notification];

        NSNotification* refreshNotification = [NSNotification notificationWithName:@"SomethingChanged"
            object:self
            userInfo:[notification userInfo]];

        [[NSNotificationCenter defaultCenter] postNotification:refreshNotification];
    }];
}

Answer 1

为了解决这个问题，我更改了代码，将其放在另一个线程中。

dispatch_queue_t mainQueue = dispatch_get_main_queue();
        dispatch_async(mainQueue, ^{

            NSFileManager *fileManager = [NSFileManager defaultManager];
            NSURL *localStore = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:dataFileName];
            NSURL *iCloud = [fileManager URLForUbiquityContainerIdentifier:nil];

            if (iCloud)
            {
                //NSLog(@"iCloud is working");

                NSURL *iCloudLogsPath = [NSURL fileURLWithPath:[[iCloud path] stringByAppendingPathComponent:iCloudLogsDirectoryName]];

                /*NSLog(@"iCloudEnabledAppID = %@",iCloudEnabledAppID);
                 NSLog(@"dataFileName = %@", dataFileName);
                 NSLog(@"iCloudDataDirectoryName = %@", iCloudDataDirectoryName);
                 NSLog(@"iCloudLogsDirectoryName = %@", iCloudLogsDirectoryName);
                 NSLog(@"iCloud = %@", iCloud);
                 NSLog(@"iCloudLogsPath = %@", iCloudLogsPath);*/

                if ([fileManager fileExistsAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]] == NO) {
                    NSError *fileSystemError;
                    [fileManager createDirectoryAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]
                           withIntermediateDirectories:YES
                                            attributes:nil
                                                 error:&fileSystemError];

                    if (fileSystemError != nil) {
                        NSLog(@"Error creating database directory %@", fileSystemError);
                    }
                }

                NSString *iCloudData = [[[iCloud path]
                                         stringByAppendingPathComponent:iCloudDataDirectoryName]
                                        stringByAppendingPathComponent:dataFileName];

                //NSLog(@"iCloudData = %@", iCloudData);

                NSMutableDictionary *options = [NSMutableDictionary dictionary];
                [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
                [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
                [options setObject:iCloudEnabledAppID forKey:NSPersistentStoreUbiquitousContentNameKey];
                [options setObject:iCloudLogsPath forKey:NSPersistentStoreUbiquitousContentURLKey];

                [psc lock];

                [psc addPersistentStoreWithType:NSSQLiteStoreType
                                  configuration:nil
                                            URL:[NSURL fileURLWithPath:iCloudData]
                                        options:options
                                          error:nil];

                [psc unlock];

            } else {

                NSLog(@"iCloud is NOT working - using a local store");
                NSMutableDictionary *options = [NSMutableDictionary dictionary];
                [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
                [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];

                [psc lock];

                [psc addPersistentStoreWithType:NSSQLiteStoreType
                                  configuration:nil
                                            URL:localStore
                                        options:options
                                          error:nil];

                [psc unlock];
            }
        });

Answer 2

如果此代码在主线程上运行，则可能是您的问题。

在第一次（或任何）启动时从哪里调用此代码？

Answer 3

自己做一些搜索，看起来这实际上是预期的行为。正如其他人所说的那样App killed by SIGKILL when changing privacy settings和https://devforums.apple.com/message/715855

文档记录很少，但按设计工作。 “在任何权限更改中，iOS将终止您的应用程序，以便您不会在以前的权限之前进行操作。例如，假设用户为您提供了”联系人“的权限。然后他们将您的应用程序置于后台并进行更改当你没有获得许可的时候，你就会根据这个想法进行操作。所以iOS只是终止了应用程序。“

“但它没有崩溃，它只是被迫重启。你会得到一条SIGKILL消息，但没有崩溃日志。”

启用iCloud时首次启动时iOS应用程序冻结

3 个答案: