问题描述
在 NSManagedObjectContextObjectsDidChangeNotification 通知中，我有时会收到 NSRefreshedObjectsKey 键.
In a NSManagedObjectContextObjectsDidChangeNotification notification, I sometimes get the NSRefreshedObjectsKey key.
我理解 刷新对象成为从持久存储/缓存中新获取的对象.
I understand refreshed objects to be a new fetch of the object from the persistent store/cache.
是什么导致通知返回刷新的对象呢?对于插入、更新、删除等，这是显而易见的，但是我必须对对象做什么才能使其出现在 NSRefreshedObjectsKey 键中?例如.是不是它可能只是以某种方式被触及(相同的值写入相同的键)?
What causes the notification to return refreshed objects then? For inserted, updated, deleted, etc it is obvious, but what must I do to an object for it to appear in the NSRefreshedObjectsKey key? E.g. is it that it may have simply been touched in some way (same values written to same keys)?
推荐答案
如果调用 '- (void)refreshObject:(NSManagedObject *)object mergeChanges:(BOOL)flag' 在一个对象上，该对象将包含在刷新的对象中.
if you call '- (void)refreshObject:(NSManagedObject *)object mergeChanges:(BOOL)flag' on an object, that object wud be included in refreshed objects.
我们使用多线程管理对象上下文，并且在合并来自 bg 上下文的更改之前，我们使用existingObject"来实现所有改变的对象.这也会导致这些对象被包含在内用于NSRefreshedObjectsKey"键.
we use multiple threaded managedobject contexts, and before merging the changes from bg context,we realize all changed objects using 'existingObject'. This also causes these objects to be includedfor 'NSRefreshedObjectsKey' key.
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