On Jan 21, 2013, at 12:20 PM, Rick Aurbach <r...@aurbach.com> wrote:
> It appears to work great, but I find that the class's executeSelector: method
> generates a warning message.
>
>> - (void) executeSelector:(NSTimer*)timer {
>> if(self.target != nil) {
>> if([self.target respondsToSelector:self.sel])
>> [self.target performSelector:self.sel withObject:self];
>> }
>> else
>> [self invalidate];
>> }
>
> where sel is defined as @property(nonatomic) SEL sel;
>
> The line containing the performSelector:withObject: method generates
> "PerformSelector may cause a leak because its selector is unknown".
>
> Ok, I agree that the selector is unknown, but we know from the previous line
> that the target responds to it.
That's not what it's complaining about. It's complaining because the ARC
compiler cannot see the name of the method you are calling, so ARC doesn't know
whether its return value needs to be released.
> So I'd like to prevent this particular warning. I'm sure I ought to know how
> do do this, but how do I go about removing this warning message? Ideally, I'd
> like to do this on a file (or occurrence) basis, so that I can make sure that
> other similar usages are similarly safe.
If you know the selectors you are calling do not return a retained object, you
can use #pragma clang diagnostic to disable warning -Warc-performSelector-leaks
around that line.
--
Greg Parker gpar...@apple.com Runtime Wrangler
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