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

Your block is retaining self because you're using self as the delegate of the UIAlertView. If self is also retaining the block, they're retaining each other, which creates a retain cycle.

Try

 __block WhateverTypeSelfIs *nonRetainedSelfForBlock = self;
[tweetViewController setCompletionHandler: 

and

UIAlertView *alert = [[UIAlertView alloc] 
                                 initWithTitle:alertTitle 
                                 message:alertMessage 
                                 delegate:nonRetainedSelfForBlock 
                                 cancelButtonTitle:alertCancelButtonTitle 
                                 otherButtonTitles:otherAlertButtonTitle,nil];

Check the Apple docs, section Object and Block Variables. Objects referenced within a block are retained, unless you use __block.