NSoperation and key value observing

Question

Hello guys!

I am creating a MyOperation object (inherited from NSOperation) and add to a NSOperationQueue. Then I am doing KVO on MyOperation. I am using this method

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context;

to get a value from MyOperation if it is finished. In this method I am using a convenience method from an other class to get some other data.

Maybe here synchronization problems in the observeValue... method?

Answer 1

I don't know your use-case, but using KVO for threads/operations isn't wise.

You could instead have your Operation object post a notification once it's complete. Or alternatively define a delegate protocol and give your Operation a delegate... you can then define some kind of 'myOperationComplete:' method which is invoked by your Operation against the delegate it was given, using performSelectorOnMainThread.