Aha, so now I have the user's preferences expressed as a mutable
string in
ICU format. So now I mutate the string to combine the user's
preferences
with my own (e.g. get rid of everything but hours and minutes, in your
case), and then:
[dateFormatter setDateFormat:f];
This can work, but not all the time. It isn't really possible to
determine which constant strings go with which fields. If you get rid
of the seconds, you also need to get rid of the string. Everyone is
familiar with this case:
hh:mm:ss
but how about this one?
hh時mm分ss秒
In the first case, you get rid of the colon between mm and ss. In the
second case, you get rid of the trailing character *after* ss.
This is a known problem, and is being worked on in ICU. See the
description of "availableFormats" in:
Deborah Goldsmith
Internationalization, Unicode liaison
Apple Computer, Inc.
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