On Sep 27, 2008, at 2:23 PM, David Niemeijer wrote:
Hi,
I have been trying to find this in the documentation and list
archives but without success so far. What is the best way to count
the number of characters in an NSString taking account of the fact
that some characters may take up multiple 16 bit slots. Using "-
(NSUInteger)length" is thus not the right way.
If I am reading you right, you are saying that -length will give you
the wrong results because some characters in Unicode are represented
by multibyte sequences. This is incorrect: -length will give you the
number of Unicode characters in a string, not the number of bytes.
However, there are characters like "combining grave accent" (U+0300)
that will usually not be displayed as a separate character, so there
is a potential problem if you want to know how many characters will
actually be displayed. The solution is to put the string into one of
the composed Normalization Forms with either -
precomposedStringWithCanonicalMapping (NFC) or -
precomposedStringWithCompatibilityMapping (NFKC), depending on your
needs. Then calling -length should give you the result you are looking
for.
For information on Unicode Normalization Forms, see http://unicode.org/reports/tr15/
.
-Michael
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