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我正在开发一个使用 CloudKit 在 iOS、macOS 和 watchOS (Xcode) 上运行的 Swift 应用程序（请参阅下面的 CloudKit-Persistency-Container 初始化代码）。该应用程序运行良好：数据通过 iCould 在所有设备上同步。

我的问题：watchOS 上的同步/镜像非常慢……而且 watchOS 必须打开。有没有办法在后台（自动）处理 watchOS 上的同步/镜像？对于 iOS，我在应用程序目标定义中添加了“后台获取”和“后台处理”……watchOS 不存在 :(

谢谢和最好的问候，拉斯。

init(inMemory: Bool = false) {
        container = NSPersistentCloudKitContainer(name: "TestersTest")
        if inMemory {
            container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
        }
        
        let l_store = NSPersistentContainer.defaultDirectoryURL()
        print(l_store)
        
        guard let description = container.persistentStoreDescriptions.first else {
            fatalError("###\(#function): Failed to retrieve a persistent store description.")
        }
        
        let url = container.persistentStoreDescriptions.first!.url
        print(url!)
        
        container.viewContext.automaticallyMergesChangesFromParent = true
        container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
        container.viewContext.undoManager = nil
        container.viewContext.shouldDeleteInaccessibleFaults = true
        
        description.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
        description.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
        description.setOption(true as NSNumber, forKey: NSMigratePersistentStoresAutomaticallyOption)
        description.setOption(true as NSNumber, forKey: NSInferMappingModelAutomaticallyOption)
        container.viewContext.transactionAuthor = "TestersTest"
        try?  container.viewContext.setQueryGenerationFrom(.current)
        
        
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        
        NotificationCenter.default.addObserver(self, selector: #selector(backgroundContextDidSave(notification:)), name: .NSManagedObjectContextDidSave, object: nil)
        
        print( "merge policy: \(container.viewContext.mergePolicy)" )
        
        backgoundContext = container.newBackgroundContext()
        
        print( "merge policy background: \(backgoundContext!.mergePolicy)" )
        
        backgoundContext!.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
        
        backgoundContext!.automaticallyMergesChangesFromParent = true
        backgoundContext!.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
        backgoundContext!.undoManager = nil
        backgoundContext!.shouldDeleteInaccessibleFaults = true
    
        
        print( "merge policy background: \(backgoundContext!.mergePolicy)" )
        
    }
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