On 19. Oct 2017, at 18:04, Mark Allan <markjal...@gmail.com> wrote:
> So I tried refactoring the block into a separate method and using an older
> NSTimer method:
> [NSTimer timerWithTimeInterval:0.2 target:self
> selector:@selector(updateTheDelegateForRunID:) userInfo:runID repeats:YES];
>
>
> This causes my privileged helper tool to crash with the following message
> printed to Console:
>
> Terminating app due to uncaught exception 'NSInvalidArgumentException',
> reason: '*** -[NSXPCEncoder _checkObject:]: This coder only encodes objects
> that adopt NSSecureCoding (object is of class '__NSCFTimer').'
What kind of class is 'self' in this case, and is the
-updateTheDelegateForRunID: method part of your XPC protocol?
Methods called by an NSTimer must have the form
-(void) foo: (NSTimer*)sender
So in this case, the first argument passed to -updateTheDelegateForRunID: will
be the timer itself. If the method call is bridged over XPC, this would mean it
would try (and fail) to secure code an NSTimer. I don't think clang knows
enough about NSTimer to be able to tell that the SEL passed to it should take
an NSTimer* argument, so you're not getting a type error, even though you are
passing a method that takes the wrong type.
Also, your parameter is probably not what you think it should be. You are
passing something named runID to your timer's userInfo. This will initialize
the timer's userInfo property with that value. It is not the value that gets
passed to -updateTheDelegateForRunID:.
So my guess is what you really need is an intermediate "timer fired" adapter
method:
-(void) updateTheDelegateForRunIDTimerFired: (NSTimer*)sender
{
[self updateTheDelegateForRunID: [sender userInfo]];
}
and pass that as the timer's selector instead.
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
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