Re: Storing a block in a CF/NSMutableDictionary?
Re: Storing a block in a CF/NSMutableDictionary?
- Subject: Re: Storing a block in a CF/NSMutableDictionary?
- From: Kyle Sluder <email@hidden>
- Date: Fri, 08 Apr 2011 17:51:30 -0700
On Fri, Apr 8, 2011 at 5:25 PM, Rick Mann <email@hidden> wrote:
> Hi. In my garbage collection-required app, I'm trying to store a code block (void (^)(void)) in a CFMutableDictionary. The docs says copy/retain/release can be sent to a block, suggesting this can be done. But it's not working. When I later retrieve the block and call it, I get an EXEC_BAD_ACCESS.
>
> This is when the block references an NSObject declared & allocated in the block's enclosing scope. If I don't access that variable, it executes fine.
As explained in the Blocks Programming Guide, you should not allow
blocks that reference stack storage to escape that scope. See
"Patterns to Avoid":
http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/Blocks/Articles/bxUsing.html
--Kyle Sluder
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