Do you know this code will always run on the main thread? Because you could
fix this from the other side, in the delegate. Use
dispatch_async(dispatch_get_main_queue(), ...) to un-assign the property.
But this won't work if you're on a non-main thread when you call back into
the delegate.
On Thu, Jul 17, 2014 at 10:01 PM, Jens Alfke <j...@mooseyard.com> wrote:
> Every once in a while I run into a bug in my code that’s triggered by self
> getting dealloced in the middle of a method. It’s usually something like
> - (void) someMethod {
> doSomeStuff;
> [self.delegate object: self didSomeStuff: yeah];
> doSomeMoreStuff;
> }
> where it turns out that the delegate method clears its reference to me,
> and that was the last reference, causing self to get dealloced during the
> delegate call, causing doSomeMoreStuff to crash.
>
> Once I’ve identified such a bug, the fix is easy: put a [[self retain]
> autorelease] at the top of the method. Except now I’m using ARC, and I
> can’t find a simple way of doing it. I tried adding
> __unused id retainedSelf = self;
> but the optimizer recognizes that retainedSelf isn’t used and strips it
> out, making this a no-op. The only thing I’ve found that works is
> CFRetain((__bridge CFTypeRef)self);
> at the top of the method, and a corresponding CFRelease at the end, but
> this is pretty ugly and could cause leaks if the method returns early.
>
> Am I missing some convenient way of doing this? I looked through the ARC
> docs, at least those I could find, and didn’t see anything relating to this.
>
> —Jens
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