Hey Devs,
I've always been having problems with Foundation's NSTimer Class when
it comes to Memory-Management. After activating the static analyzer in
Xcode (very useful!), it immediately reminds me of autoreleasing my
instance of NSTimer and I thought like why is the NSTimer never being
deallocated?? OKay so I created a demo NSTimer memory app and started
testing with Instruments (Object Allocations Tool). In my opinion,
there's a serious memory leak here since it's impossible to release an
NSCFTimer. If I create it like that (should be actually autoreleased
if repeat is set to NO and must be released manually or by calling -
invalidate if repeat is set to YES):
[NSTimer scheduledTimerWithTimeInterval:0.1
target:self
selector:@selector(fire:)
userInfo:nil
repeats:YES];
I sent an -invalidate to my instance of NSTimer in -fire: but
Instruments told me the object was still alive. This is really
confusing, I think the instance should be released when sending an
invalidate so mem-management is clean and fine as it is in every other
Apple ObjC class.
Since that didn't work I added a -release after invalidating the
timer. This results in an EXC_BAD_ACESS (Invalid address) although its
retain count was 1. I guess there's something else going wrong inside
the NSTimer.
Unfortunately, the Apple NSTimer docs don't say anything about mem
managment (nothing in discussion or sth like that)…
That's why I tried allocating the timer with alloc/init this way:
[[[NSTimer alloc] initWithFireDate:[NSDate date]
interval:0.1
target:self
selector:@selector(fire:)
userInfo:nil
repeats:YES] autorelease];
After adding it to the current run-loop and invalidating it in -fire:
it still remained in memory. Forcing an deallocation with an extra
release (Note: this is just wrong since I never retained it without
doing a release afterwards!) it crashed again with an invalid address.
What am I doing wrong? There really should be a way to deallocate an
instance of NSTimer, I guess.
Thanks, guys!
Best regards,
Tobias Jordan._______________________________________________
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