[localization] Plurals and strings

formatting.m

// Take %1$#@lu_pills@ at %2$@
NSString* format = NSLocalizedString(@"REMINDER_PREVIEW_FORMAT", nil);

NSString txtDate = @"5:42 PM";

NSString* result = [NSString localizedStringWithFormat:format
                                 (unsigned long long)[reminder numberOfPills],
                                 txtDate];
                                 
// Actual   : Take 1 pill at (null)
// Expected : Take 1 pill at 5:42 PM
                                 

Localisable.stringsdict

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>REMINDER_PREVIEW_FORMAT</key>
        <dict>
            <key>NSStringLocalizedFormatKey</key>
            <string>Take %1$#@lu_pills@ at %2$@</string>
            
            <key>lu_pills</key>
            <dict>
                <key>NSStringFormatSpecTypeKey</key>
                <string>NSStringPluralRuleType</string>
                
                <key>NSStringFormatValueTypeKey</key>
                <string>lu</string>
                
                <key>one</key>
                <string>%1$lu pill</string>
                
                <key>other</key>
                <string>%1$lu pills</string>
            </dict>
        </dict>
    </dict>
</plist>

    result = [result stringByReplacingOccurrencesOfString:@"(null)"
                                               withString:txtDate];

A very dirty workaround

Solution : types of integers must match.

%1$lu + unsigned long
%1llu + unsigned long long

// Take %1$#@lu_pills@ at %2$@
NSString* format = NSLocalizedString(@"REMINDER_PREVIEW_FORMAT", nil);

NSString txtDate = @"5:42 PM";

NSString* result = [NSString localizedStringWithFormat:format
                                 (unsigned long)[reminder numberOfPills],
                                 txtDate];