Am Fr,22.08.2008 um 15:28 schrieb Graham Cox:
On 22 Aug 2008, at 10:55 pm, Ron Fleckner wrote:
Sorry, my question was very badly put. I've already apologised to
two other answerers. I should have said: Is there a better way -
other than using an NSTimer - to update the clock? That is, how
does the system clock do it?
I think now that this is not strictly a Cocoa question.
Using a timer isn't too bad. Running at two updates per second
should be acceptable since you're sampling at twice the highest
"event" frequency. You might want to go a bit faster and maybe at a
slightly odd multiple of one second to make sure you don't end up
with a constant half-second lag.
I think, that a higher event-frequency is not neccessary. He should
use an interval of close to one second (something like 0.99 seconds).
In his timer method he simply waits in a loop for the "tick tack" and
displays the result. So he will not have a constant phase shift
(except of the drawing interval).
If the system becomes busy (his application doesn't sound like that),
he maybe misses a second. That is acceptable if the system is busy.
Cheers,
Amin
The timer should compare the previous second with the current second
and only update the display if it's changed. That way your timer
isn't wasting cycles redrawing the same thing every time, but only
when it changes.
hth,
Graham
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