我试图现在就弄清楚 我所有的核心数据都在主线上管理, 使用单一的上下文。 我使用仪器, 并且注意到保存操作将主线屏蔽了相当一段时间 。 我想用 GCD 将保存操作运行在背景线上 。
现在我明白了如何设置此进程, 创建一个新的线索/ 上下文, 并倾听“ 保存” 通知, 以合并到主线上 。
但当我创建新环境时, 所有主线上下文的更改都需要插入/ 合并到新上下文中, 否则它不会有什么要保存的吗? 我似乎可以找到这方面的任何例子 。
例如,关于我的主要背景:
现在,我如何使我的背景背景 知道这些变化?
当应用程序启动时正确创建背景背景, 并让它倾听 NSManagedObjectFormObjects 是否在主线上更改通知以保持其同步是否合理?
在 iOS 5 中, 您可以很容易地使用新的货币类型 。 如果您与 NS IndiviceQuueConformaticType 创建了上下文, 您将不会屏蔽主线 。 但是, 您必须访问您块内的上下文, 并将其传送到管理 ObjectCtext: performatBlock 方法 。
您无法在线索之间通过NSManagedObject 实例 。 如果您在与大型数据集挣扎中, 您可能需要阅读 < a href=" http://www. cimgf.com/2011/ 08/ introducting- and-displaying- macus- datas- in- core- data/" rel=“ nofollow” > this post by Marcus Zarra.
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