Shut down a Core Data store prior to deleting the underlying file

shut down core data.m

- (void)closeDown {
    NSArray *stores = [self.persistentStoreCoordinator persistentStores];
    for (NSPersistentStore *store in stores) {
        DebugLogging(@"Closing Core Data store at %@", [store URL]);
        NSError *error = nil;
        if (![self.persistentStoreCoordinator removePersistentStore:store error:&error]) {
            DebugLogging(@"Unable to close Core Data store: error %@", [error localizedDescription]);
        }
    }
}

Core Data immediately gets v unhappy if you delete the file before closing down properly.