-[NSBundle preferredLocalizationsFromArray:forPreferences:] doesn't fallback on country codes (or has inconsistent behavior)

Originator:kemenaran
Number:rdar://14228383 Date Originated:21-Jun-2013 03:04 PM
Status:Open Resolved:
Product:iOS SDK Product Version:7.0b1
Classification:Other Bug Reproducible:Always
 
Summary:

-[NSBundle preferredLocalizationsFromArray:forPreferences:] doesn't handle country codes properly.

A Country code in the `preferencesArray` argument work as expected; but when a country code is present in the `localizationsArray`, the method doesn't fallback on the generic language or on another country code of the same language.

Steps to reproduce:

// Some correct results
[NSBundle preferredLocalizationsFromArray:@[@"de", @"en"]    forPreferences:@[@"en"]];    // en    (expected)
[NSBundle preferredLocalizationsFromArray:@[@"de", @"en-GB"] forPreferences:@[@"en-GB"]]; // en-GB (expected)
[NSBundle preferredLocalizationsFromArray:@[@"de", @"en"]    forPreferences:@[@"en-GB"]]; // en    (expected)

// Some unexpected results
[NSBundle preferredLocalizationsFromArray:@[@"de", @"en-GB"] forPreferences:@[@"en"]];    // de    (unexpected)
[NSBundle preferredLocalizationsFromArray:@[@"de", @"fr-FR"] forPreferences:@[@"fr"]];    // de    (unexpected)
[NSBundle preferredLocalizationsFromArray:@[@"de", @"en-US"] forPreferences:@[@"en"]];    // en    (wtf)

Expected Results:

The method should fallback on another country code of the same language if available. Also the "en-US" locale should not be special-cased.

Notes:

This is also broken in iOS 6. I suspect it never worked as expected.

Comments

Sample Project

https://github.com/kemenaran/NSBundle-PreferredLocalizations-Sample

By kemenaran at June 24, 2013, 11:13 a.m. (reply...)

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