On Jan 26, 2012, at 1:51 PM, Jan E. Schotsman wrote:
> This code is given in the "Transitioning to ARC Release Notes" as an example
> of accomodating blocks in an ARC environment:
>
> __block MyViewController *myController = [[MyViewController alloc] init…];
> // ...
> myController.completionHandler = ^(NSInteger result) {
> [myController dismissViewControllerAnimated:YES completion:nil];
> myController = nil;
> };
>
> Supposedly this avoids a retain cycle. But where is the cycle? At least two
> objects are needed for a cycle. What is the second one?
Remember that blocks are objects too. If you are not careful then the view
controller points to the block object and the block object points back to the
view controller.
--
Greg Parker [email protected] Runtime Wrangler
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