Le 26 janv. 2012 à 22:51, Jan E. Schotsman a écrit :
> Hello,
>
> 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?
The first object if myController.
The second object is the block.
myController retains the block.
the block retains myController.
You have your retain cycle.
-- Jean-Daniel
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