轻量级迁移完成通知 [英] Lightweight migration completed notification

问题描述

我已经成功地使用轻量级迁移的几个版本，但在我最新的版本，我需要加载一些在迁移过程中创建的表与迁移完成后的数据。我想象的是，当我的初始 UIViewController 调用该方法加载数据到新的表，可能是迁移尚未完成，应用程序将崩溃，因此：

I've been using lightweight migration for several versions successfully, but in my newest version I need to load some tables that are created during the migration with data after the migration completes. I imagine it's possible that when my initial UIViewController calls the method to load data into the new tables, the migration hasn't completed and the app will crash, so:

如何确定轻量级迁移已完成？

推荐答案

当您使用相应的选项调用 addPersistentStoreWithType：...
时，会发生自动轻量级迁移，并在调用返回时完成。
在后台没有异步迁移。

The automatic lightweight migration happens when you call addPersistentStoreWithType:... with the corresponding options, and is completed when that call returns. There is no asynchronous migration in the background.

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