Call me crazy, but why wouldn't this work? (warning: typed in mail)
return ([NSString stringWithFormat:@"%.*f%%",places,[valueToRound
doubleValue]]);
Lorenzo Thurman <mailto:[EMAIL PROTECTED]> wrote (Tuesday, April 8, 2008 8:07
AM -0500):
> 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:@"[EMAIL PROTECTED]@", newValue, @"%"];
> }
>
> Is this the best way to do this? It works just fine, but I was wondering if
> there was a better way.
> Thanks
--
James Bucanek
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