您如何将现有的核心数据iOS 7应用程序的数据迁移到iCloud？

lehn0058 发表于 Dev

lehn0058

我有一个已经使用Core Data的iOS 7应用。我已使用新的iOS 7方法将iCloud集成到我的应用程序中，以使用以下代码为例同步存储在核心数据中的项目：

https://github.com/mluisbrown/iCloudCoreDataStack/blob/master/README.md

这很好用，只是设备上的所有原始数据没有显示在iCloud存储中。我一直听到我需要迁移数据-但找不到任何有关如何正确执行此操作的示例。有谁知道如何做到这一点？

我一直指着使用migrationPersistentStore：toURL：options：withType：error：，但是我看不到如何使用它...

邓肯·格罗内瓦尔德（Duncan Groenewald）

这是带有iCloud控制面板的示例应用程序，用于将商店移入或移出iCloud。要移动现有商店，您需要使用现有选项将其打开，但请确保对目标商店使用iOS7选项。查看其中的示例应用程序代码OSCDStackManager，如果您有特定问题，请发布它们。http://ossh.com.au/design-and-technology/software-development/sample-library-style-ios-core-data-app-with-icloud-integration/

- (bool)moveStoreFileToICloud:(NSURL*)fileURL delete:(bool)shouldDelete backup:(bool)shouldBackup {
    FLOG(@" called");

    // Always make a backup of the local store before migrating to iCloud
    if (shouldBackup)
        [self backupLocalStore];

    NSPersistentStoreCoordinator *migrationPSC = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.managedObjectModel];

    // Open the existing local store using the original options
    id sourceStore = [migrationPSC addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:fileURL options:[self localStoreOptions] error:nil];

    if (!sourceStore) {

        FLOG(@" failed to add old store");
        return FALSE;
    } else {
        FLOG(@" Successfully added store to migrate");

        bool moveSuccess = NO;
        NSError *error;

        FLOG(@" About to migrate the store...");
        // Now migrate the store using the iCloud options
        id migrationSuccess = [migrationPSC migratePersistentStore:sourceStore toURL:[self icloudStoreURL] options:[self icloudStoreOptions] withType:NSSQLiteStoreType error:&error];

        if (migrationSuccess) {
            moveSuccess = YES;
            FLOG(@"store successfully migrated");
            [self deregisterForStoreChanges];
            _persistentStoreCoordinator = nil;
            _managedObjectContext = nil;
            self.storeURL = [self icloudStoreURL];
            // Now delete the local file
            if (shouldDelete) {
                FLOG(@" deleting local store");
                [self deleteLocalStore];
            } else {
                FLOG(@" not deleting local store");
            }
            return TRUE;
        }
        else {
            FLOG(@"Failed to migrate store: %@, %@", error, error.userInfo);
            return FALSE;
        }

    }
    return FALSE;
}