iOS 5 Twitter Framework & completionHandler block - “Capturing 'self' strongly in this block is likely to lead to a retain cycle”

Question

I am very new to programming and Objective-C and I am trying to work out what is wrong with my code. I have read a bit about blocks but I don\'t know how any of what I have read

Answer 1

According to stuff I've seen elsewhere, “weak” won't work for ARC-compliant code, and that you must use “_unsafe_unretained” instead. This is what I did to fix the “Capturing 'self' strongly in this block is likely to lead to a retain cycle” warning in the Apple sample app "AVPlayerDemo":

__unsafe_unretained id unself = self;
mTimeObserver = [mPlayer addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(interval, NSEC_PER_SEC) 
                            queue:NULL /* If you pass NULL, the main queue is used. */
                            usingBlock:^(CMTime time) 
                                        {
                                            /* 'unself' replaced 'self' here: */
                                            [unself syncScrubber];
                                        }];