Hi all,
I'm currently writing a Mac app which performs some lengthy process on some
data, and for a variety of reasons it needs to do this via privileged helper
tool.
The class which does the work sends progress updates periodically to its
delegate, which then communicates these back to the main app.
The main app communicates with the helper tool via NSXPCConnection.
I'm using an NSTimer to send the update messages to the delegate with the
following incantation:
[NSTimer timerWithTimeInterval:0.2 repeats:YES block:^(NSTimer * _Nonnull
timer) { ... }];
This works fine, but I've just realised NSTimer's
timerWithTimeInterval:repeats:block: is only available with macOS 10.12 and I
still need to support 10.8.
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').'
Initially, I thought this meant my own class needed to conform to
NSSecureCoding, but after some failed attempts, it think it's trying to tell me
that it can't do it because *NSTimer* doesn't conform to NSSecureCoding. Is
that correct, and if so does anyone know of a way around this issue?
I guess, if push comes to shove, I could put the timer in the main app and have
it request updates from the helper tool, but that sounds awfully like polling,
and feels like it would be the wrong way round!
Grateful for any suggestions.
Many thanks
Mark
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