Re: NSNumber Formatter with percent?
Re: NSNumber Formatter with percent?
- Subject: Re: NSNumber Formatter with percent?
- From: Christopher Kane <email@hidden>
- Date: Sat, 26 Jul 2008 09:45:33 -0700
On Jul 19, 2008, at 5:13 PM, Todd Heberlein wrote:
I was working through Hillegass's latest book and chapter 8 has me
applying an NSNumberFormatter to one of the columns of a table view.
Unfortunately I get unexpected behavior when I modify one of the
values in the column. For example, if I add several employees (which
have a default value of 5%), then I modify one of the numbers (say
to 7%) then *all* the other number values get displayed as 500%.
Furthermore, all new values are automatically displayed with a raise
of 500% (as opposed to just 5%).
This is a known bug in 10.5 with NSNumberFormatter (and perhaps
earlier), when the string to be parsed can't be initially parsed and
has to try again in a different way.
As for the suggestion to use the 10.0 behavior mode, the multiplier
property and the percent style don't work with 10.0 behavior, so
you'll have to roll your own percent handling and multiplication and
division.
A workaround for 10.5 might be to set the multiplier after each string-
>number parse attempt (and the various methods which do that).
Something like [formatter setMultiplier:[formatter multiplier]]
perhaps, due to the indirect things that happen when you do that.
This is not particularly easy though if you have a number formatter
set up in a nib file and/or attached to a cell. You might subclass
NSNumberFormatter, or implement a post-user-input delegate method on
the particular control, or perhaps something else.
Chris Kane
Cocoa Frameworks, Apple
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