NSOperation and waitUntilFinished

[Koen van der Drift]

I am trying to understand how to wait for an NSOperation to complete, for 
example:


    NSOperationQueue *opQueue = [[NSOperationQueue alloc] init];
    ImportOperation *importOp = [[ImportOperation alloc] initWithArray: 
anArray];
    
    NSLog@"start import");

    [opQueue waitUntilAllOperationsAreFinished];
    [opQueue addOperation: importOp];

    NSLog(@"end import");
    

And in main() of the operation:

- (void)main
{
 // Create context on background thread
    AppDelegate *appController = [[NSApplication sharedApplication] delegate];
    
    self.context =[[NSManagedObjectContext alloc] init];
    [self.context setUndoManager:nil];
    [self.context setPersistentStoreCoordinator:[appController 
persistentStoreCoordinator]];
    
 // Register context with the notification center
    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc addObserver:self
           selector:@selector(mergeChanges:)
               name:NSManagedObjectContextDidSaveNotification
             object: self.context];
    
    NSLog(@"begin of importRecords in operation");

    [self.context importRecords: self.recordsArray];  // long process to import 
records from an array of dictionaries

    NSLog(@"end of importRecords in operation");
}

The NSLog's appear in this order in the console:

start import
end import
begin of importRecords in operation
end of importRecords in operation


while I'd like it to be:

start import
begin of importRecords in operation
end of importRecords in operation
end import


Can anyone explain this?

Thanks,

- Koen.





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