Hello,
I have a problem I can't quite figure out. I have a program that displays
some Hebrew text. I notice that at times some of the vowel markings are not
displayed in the correct place. I figured out that this happened when I had
applied some arbitrary attributes to that range of text.
I was under the impression that one could set any key value pair not used by
the Cocoa text system to a part of an attributed string without consequence.
Anyway, I wrote a test program that illustrates this quite dramatically. All
the program does is this basically:
-(IBAction)work:(id)sender
{
NSTextStorage *ts = [textView textStorage];
NSRange r = {0,1};
for (;r.location+r.length<=[ts length]; r.location++)
{
[ts addAttribute:[NSString
stringWithFormat:@"Nonsense%u",r.location]
value:[NSString
stringWithFormat:@"Gibberish%u",r.location]
range:r];
}
}
The results can be seen in the two images on this webpage:
http://www.rivulus-sw.com/junk/hebrew_text_test.html
The xcode project for the test program can be downloaded from
http://www.rivulus-sw.com/junk/hebrew_text_tester.zip
Note that copying the garbled text into another program, like TextEdit, where
the additional attributes are presumably stripped out, causes the test to
display normally again.
With Latin text I haven't seen any problems, even when using diacriticals.
The problems in my actual program have been much more subtle than those in the
test program, probably because I haven't been applying different attributes to
each character.
Could someone give me some tips on what I'm doing wrong here or how I can avoid
this text mangling?
Many Thanks,
Philip White
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