Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining?
Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining?
- Subject: Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining?
- From: "Chunk 1978" <email@hidden>
- Date: Thu, 11 Dec 2008 09:29:49 -0500
sorry, i meant to say:
ideally, it would be nice to have that start at 00 59 59 instead of 00
00 59.
:)
On Thu, Dec 11, 2008 at 7:32 AM, Chunk 1978 <email@hidden> wrote:
> thanks everyone for the answers.
>
> i agree that Ashley's method is far more readable than using modulus
> calculations, so i'll look into that further as i can't seem to get it
> working yet.
>
> currently, i have this working using modulus calculations, but it
> starts at 00 for the hours and minutes...
>
> -=-=-=-=-
> -(int)timeMenuSelection
> {
> return [[menu selectedItem] tag];
> }
>
> - (IBAction)startTimer:(id)sender
> {
> startTime = [NSDate timeIntervalSinceReferenceDate];
>
> [killTimer invalidate];
> [killTimer release];
> killTimer = nil;
>
> killTimer = [[NSTimer scheduledTimerWithTimeInterval:30 target:self
> selector:@selector(updateTime:) userInfo:nil repeats:YES] retain];
> }
>
> - (void)updateTime:(NSTimer *)theTimer
> {
> NSTimeInterval now = [NSDate timeIntervalSinceReferenceDate];
> NSTimeInterval interval = now - startTime;
> int second = (int)interval;
>
> //Tag #1 x 3600 Seconds = 3600 Seconds = 2 Hours.
> //Tag #2 x 3600 Seconds = 7200 Seconds = 2 Hours.
> //Tag #3 x 3600 Seconds = 10800 Seconds = 3 Hours.
>
> int hoursSelected = ([self timeMenuSelection] * 3600);
>
> if (second <= hoursSelected)
> {
> NSLog(@"%.2d %.2d %.2d ", (hoursSelected-second)/3600,
> (hoursSelected*60-second/60)`, (hoursSelected*3600-second)`);
> }
> else
> {
> NSLog(@"TIME'S UP!");
> [killTimer invalidate];
> [killTimer release];
> killTimer = nil;
> }
> }
> -=-=-=-=-=-
>
> here's a sample output when the first minute of counting down is about
> to change:
>
> 2008-12-11 07:28:02.028 timerTest[27467:10b] 00 00 04
> 2008-12-11 07:28:03.028 timerTest[27467:10b] 00 00 03
> 2008-12-11 07:28:04.028 timerTest[27467:10b] 00 00 02
> 2008-12-11 07:28:05.028 timerTest[27467:10b] 00 00 01
> 2008-12-11 07:28:06.028 timerTest[27467:10b] 00 59 00
> 2008-12-11 07:28:07.028 timerTest[27467:10b] 00 59 59
> 2008-12-11 07:28:08.028 timerTest[27467:10b] 00 59 58
> 2008-12-11 07:28:09.028 timerTest[27467:10b] 00 59 57
> 2008-12-11 07:28:10.028 timerTest[27467:10b] 00 59 56
> 2008-12-11 07:28:11.029 timerTest[27467:10b] 00 59 55
> 2008-12-11 07:28:12.028 timerTest[27467:10b] 00 59 54
>
> ideally, it would be nice to have that start at 00 59 00 instead of 00
> 00 00, otherwise it's adding an additional minute (i think) and won't
> look appropriate at the beginning... a user selecting 1 hour will
> first read "Time Remaining: 00 Hours 00 Minutes 00 Seconds"
>
>
>
> On Thu, Dec 11, 2008 at 12:36 AM, Ashley Clark <email@hidden> wrote:
>> On Dec 10, 2008, at 8:06 PM, Nick Zitzmann wrote:
>>
>>> On Dec 10, 2008, at 6:41 PM, Chunk 1978 wrote:
>>>
>>>> i read in the docs that the use of NSCalandarDate is discouraged
>>>> because it's going to be depreciated for OS X 10.6... i'm not really
>>>> sure if depreciated means that any code with NSCalandarDate will no
>>>> longer function with the new OS or if it will just be considered out
>>>> dated...
>>>
>>>
>>> The OP said NSDateComponents, not NSCalendarDate. NSDateComponents will
>>> not be deprecated any time soon. And despite what the docs say, I don't
>>> think NSCalendarDate is going away soon, because only NSCalendarDate
>>> supports encapsulating a time zone within a date.
>>>
>>> In any case, if you can avoid using NSCalendar/NSDateComponents to make a
>>> calendrical calculation, I'd recommend you do so. NSCalendar is quite slow
>>> to make even the most basic of calculations, especially on PPC Macs.
>>
>>
>> Certainly in a tight loop it might not be appropriate to use NSCalendar but
>> the OP was using them for display in a timer that only fired once a second.
>> I'd argue that the NSCalendar/NSDateComponns method calls are more readable
>> than modulo arithmetic for most people.
>>
>> I'd be interested in knowing what kind of performance you saw on PPC Macs
>> though that would cause you to write them off in all situations. I've not
>> come across that in my testing.
>>
>>
>> Ashley
>>
>>
>
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| References: | |
| | >Countdown With NSTimer - Hours, Minutes, Seconds Remaining? (From: "Chunk 1978" <email@hidden>) |
| | >Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining? (From: Ashley Clark <email@hidden>) |
| | >Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining? (From: "Chunk 1978" <email@hidden>) |
| | >Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining? (From: Nick Zitzmann <email@hidden>) |
| | >Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining? (From: Ashley Clark <email@hidden>) |
| | >Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining? (From: "Chunk 1978" <email@hidden>) |