Re: Reformatting percent string to two decimal places
Re: Reformatting percent string to two decimal places
- Subject: Re: Reformatting percent string to two decimal places
- From: Michael Vannorsdel <email@hidden>
- Date: Tue, 8 Apr 2008 09:15:00 -0600
For string formats there's "%.2f" which means show 2 places after the
decimal, it's rounded as well. Also, you can use "%%" to print a
literal % symbol.
On Apr 8, 2008, at 9:07 AM, Lorenzo Thurman wrote:
I have the string representation of a percentage value, that goes to 6
places beyond the decimal point. Something like this:
64.123456%. I want to round that to 2 places and keep the percent
sign at
the end e.g. 64.12% and return it as an NSString. I was playing
around with
NSNumberFormatter (in code not IB) and was not able to either, keep
the
percent sign or round properly, depending on the value passed to
setStyle of
my NSNumberFormatter object. What I initially did was convert the
string I
was passed into an NSNumber using NSString floatValue. This would
loose the
percent sign at the end, but I could restore it by passing
setStyle:NSFormatterPercentStyle to the formatter. But when I did
this, the
decimal was lost, so the number would end up like this:
64,1234%. I played around with my formatter using
NSFormatterDecimalStyle or
NSFormatterPercentStyle, but never get what I wanted. Can these be
used
together in the same formatter? or'd maybe? The docs don't say, it
doesn't
work in any case, so I assume no. What I ended up doing was this:
// Takes a string containing a decimal percent
// rounds it off toNumPlaces and returns the
// resulting string
-(NSString*) roundValue:(NSString*)valueToRound toNumPlaces:(unsigned
int)places{
NSLocale* locale = [NSLocale currentLocale];
NSDecimalNumberHandler* roundingBehavior =
[NSDecimalNumberHandler
decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:places
raiseOnExactness:NO
raiseOnOverflow:NO raiseOnUnderflow:NO
raiseOnDivideByZero:NO];
NSDecimalNumber* fv = [[NSDecimalNumber
decimalNumberWithString:valueToRound ]
decimalNumberByRoundingAccordingToBehavior:roundingBehavior];
NSNumberFormatter* formatter = [[NSNumberFormatter alloc] init];
[formatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setLocale:locale];
NSString* newValue = [formatter stringFromNumber:fv ];
[formatter release];
return [NSString stringWithFormat:@"%@%@", newValue, @"%"];
}
Is this the best way to do this? It works just fine, but I was
wondering if
there was a better way.
Thanks
--
"My break-dancing days are over, but there's always the funky chicken"
--The Full Monty
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