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例如:爲什麼我應該在阻止撤銷註冊時調用-processPendingChanges?
[[managedObjectContext undoManager] disableUndoRegistration];
// changes which shouldn't be undo-able
[managedObjectContext processPendingChanges];
[[managedObjectContext undoManager] enableUndoRegistration];
這真的很重要嗎?重點是什麼?