为核心数据写入创建后台线程

Creating Background Thread for Core Data writing(为核心数据写入创建后台线程)

问题描述

我正在尝试重新创建这篇 cocoanetics 文章中描述的三层核心数据系统 (http://www.cocoanetics.com/2012/07/multi-context-coredata/).我遇到的问题是在自己的后台线程上创建私有 MOC.我对多线程以及如何在目标 c 中完成它没有太多经验.我一直在阅读文章并试图掌握如何正确实施这种方法，但我最终承认我不知道自己在做什么.

I'm trying to recreate the three tier core data system that is described in this cocoanetics article ( http://www.cocoanetics.com/2012/07/multi-context-coredata/). The problem I'm running into is creating the private MOC on its own background thread. I don't have much experience with multithreading and how it should be done in objective c. I've been reading over articles and trying to grasp how to correctly implement this approach, but I have finally conceded to the fact that I don't know what I'm doing.

要创建这种方法，我是否需要创建一个 NSThread 并对其进行管理?还是有我不理解的更简单的方法?

To create this approach, do I need to create an NSThread and manage it? Or is there a simpler way that I'm not understanding?

推荐答案

在后台执行 Core Data 操作的最简单方法是创建 NSPrivateQueueConcurrencyType 的托管对象上下文.这种类型的 MOC 创建和管理私有队列.使用 performBlock 或 performBlockAndWait 在私有 MOC 上执行操作可确保使用正确的队列.

The easiest way to perform Core Data operations in the background is to create a managed object context of the NSPrivateQueueConcurrencyType. This type of MOC creates and manages a private queue. Using performBlock or performBlockAndWait to execute operations on the private MOC ensures that the right queue is used.

参见 托管对象上下文的并发支持在 OS X v10.7 和 iOS 5.0 的核心数据发行说明中了解详细信息和示例.

See Concurrency Support for Managed Object Contexts in the Core Data Release Notes for OS X v10.7 and iOS 5.0 for details and examples.

我只能推荐观看 WWDC 2011 Session 303What's New in Core Data on iOS"的视频或幻灯片，其中解释了 Core Data 并发.

I can only recommend to watch the video or slides from the WWDC 2011 Session 303 "What’s New in Core Data on iOS", where Core Data concurrency is explained.

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