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Editorial Team
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Asked: 2026-06-13T06:13:27+00:00

I have a phonebook app where I generate the title for section headers by

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I have a phonebook app where I generate the title for section headers by comparing the first letters of entries.

The indexes are predefined so I expect letters to be assigned from A-Z and for numbers #.

The problem is there are many letter with accents including ü, İ, ç etc in many languages. In my approach, since these chars do not fall under the range A-Z, they are assigned to # which is not desired.

The native iOS Phonebook app assigns for example ü to U and so on. Is there a simple way to make this casting without defining a set of chars?

Thanks.

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1 Answer

  1. Editorial Team

    Check out Unicode Normalization. You probably want some combination of NFD and extraction of the adequate data. If you look at this file from Unicode, you will see something like

    00E9;LATIN SMALL LETTER E ACUTE;Ll;0;L;0065 0301;;;;N;;;00C9;;00C9

    Where 00E9, ie ‘é’, is decomposed as 0065 0301. You pick up 0065 (a), and discard 0301 (´). This file should get you started nicely. There may be equivalent functions in Objective-C/iOS, but I wouldn’t know where to start…

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