On 24.09.2008, at 01:20, Dan Birns wrote:
My application needs to set a timer that causes a function to be
called at a time in the future. This is non-repeating, and
sometimes has be immediate. I need it to be as efficient as
possible, because it's called frequently.
Have you checked out the various performSelector: methods available?
Particularly performSelector:withObject:afterDelay: seems to be a
shorthand that might work much better. In any case though, watch out
for Cocoa's run loop modes. By default, timers only get scheduled on
NSDefaultRunLoopMode, so if you want your timer to also fire in
NSModalPanelRunLoopMode or NSTrackingRunLoopMode (names from memory,
may vary slightly), you may need to use the appropriate calls (the
inModes: variant, or do an addTimer for the additional modes).
self.timer = [NSTimer scheduledTimerWithTimeInterval: t
// seconds
target: self
selector: @selector
(mainLoopTimer:)
userInfo: nil
repeats: NO];
This is working fine, but our performance is poor. It's not so poor
that it's obviously broken, but I'm looking for ways to improve it.
I've been try to alloc one NSTimer that I reuse, and I've had no
success doing so.
How did you measure this? What value is 't' ?
I've tried
timer = [NSTimer alloc];
[timer initWithFireDate:[NSDate date] interval:t target:self
selector:@selector(mainLoopTimer:) userInfo:halTimer repeats:NO];
[[NSRunLoop currentRunLoop] addTimer:timer
forMode:NSDefaultRunLoopMode];
Why are you discarding the result of initWithFireDate:? You could be
talking to the completely wrong object here. You really should use the
ObjC [[NSClass alloc] init] idiom here, everything is engineered
towards that, and timer is not guaranteed to be valid after the init
call, you're supposed to re-set it to whatever the init returned.
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
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