That depends on what you mean when you say "animation." NSTimer works fine for triggering screen updates. But if your animation is physics-based - a 3d "shooter" game, for instance - you'll want something like the aforementioned mach_absolute_time to keep the animation smooth.
sherm-- On Mon, Jul 26, 2010 at 12:27 PM, Charlie Dickman <3tothe...@comcast.net> wrote: > As long as the NSTimer firing interval is sufficiently small the NSTimer can > be used. If the run loop is stalled for any "significant: time _all_ timers > will be inaccurate to some degree. The NSTimer works fine for animation and , > e.g., alarm timers and they are consistent across platforms such as Mac Pros, > iMacs, iPhones, etc. > > On Jul 26, 2010, at 12:12 PM, Kyle Sluder wrote: > >> On Jul 26, 2010, at 8:32 AM, Charlie Dickman <3tothe...@comcast.net> wrote: >> >>> Try using an NSTimer with a repeating timeout interval of, say, .001 (or >>> anything smaller than your required accuracy), and countdown your time >>> delta by the same amount each time the NSTimer fires and when you get to >>> zero you'll have what you need. >> >> NSTimer is not suitable for timekeeping of any significant resolution. >> NSTimer works by comparing the current time at the top of the runloop with >> the last time the timer was fired. Obviously, this is highly susceptible to >> anything that prevents the runloop from running at at least the timer >> interval—which on a modern multitasking operating system is quite likely. >> >> mach_absolute_time is certainly the way to go. The best advice I've seen out >> there is to listen for sleep/wake notifications from IOKit and record the >> system time there to figure out how much time has elapsed between the two. >> >> >> --Kyle Sluder > > Charlie Dickman > 3tothe...@comcast.net > > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/sherm.pendley%40gmail.com > > This email sent to sherm.pend...@gmail.com > -- Cocoa programming in Perl: http://www.camelbones.org _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
