如何从核心数据数据库中删除 iCloud 同步答案

【问题标题】：How can I remove iCloud sync from core data database如何从核心数据数据库中删除 iCloud 同步
【发布时间】：2018-06-21 18:43:14
【问题描述】：

我有一个应用程序，它使用旧的 iCloud 同步，我想删除此功能。因此，当我尝试从persistentStoreCoordinator 的选项中删除“NSPersistentStoreUbiquitousContentNameKey”时，我将丢失整个数据库项目。有人知道我必须做什么吗？数据库迁移？

    let containerPath = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.de.companyName.appname")?.path
    let sqlitePath = NSString(format: "%@/%@", containerPath!, "AppName")
    let url = URL(fileURLWithPath: sqlitePath as String)

    var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    var error: NSError? = nil

    var failureReason = "There was an error creating or loading the application's saved data."
    let mOptions = [NSPersistentStoreUbiquitousContentNameKey: "AppNameCloud", NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true] as [String : Any]
    do {
        try coordinator!.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: mOptions)
    } 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" as AnyObject?
        dict[NSLocalizedFailureReasonErrorKey] = failureReason as AnyObject?
        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()
    }

    return coordinator

【问题讨论】：

标签： ios swift core-data icloud

【解决方案1】：

迁移是我要做的。删除普遍存在的内容键使 Core Data 加载不同的持久存储。由于它是新的和空的，因此您现有的数据不存在。

您要做的是加载现有的 iCloud 数据存储，然后使用 NSPersistentStoreCoordinator 上的 migratePersistentStore(_:to:options:withType:) 方法将所有数据移动到非 iCloud 存储。完成后，开始使用新的商店文件。

【讨论】：