This sample application sets up a basic Core Data stack and NSFetchedResultsController in order to check how delegate messages are delivered. To my knowledge, Core Data makes no guarantees about the ordering of these messages; if you know otherwise, please get in touch.
After cloning the repo, run the app directly from Xcode. Have the console open in Xcode to watch results.
The app manages an in-memory managed object context, in which you can manipulate objects using the three steppers. After setting values into each field, click "Go" to perform the specified operations in a batch. Each call to an NSFetchedResultsControllerDelegate method will be logged to the console.
There are two caveats on the operations you can perform:
- Making no changes (i.e. setting 0 for all fields) will produce no output.
- You cannot update and delete more objects combined than exist in the MOC. The
app applies each change to a unique object, so there must already be at least
updates + deletesobjects existing in the MOC. A console message will warn you if this is requirement is violated.