How to handle special cases in localization swift

Question

I created a Localizable.strings file and the translation works fine. But there is a special case where in english there is one word for singular and plural, like \'series\'.

Answer 1

This is exactly what the Plural Rule Properties in Stringsdict files are for.

So in addition to the "Localizable.strings" file you have to provide a "Localizable.stringsdict" property list file with plural rules for the language. In your case:

Localizable.strings:

"%ld series" = "%ld Serien";

Localizable.stringsdict:

    %ld series
    
        NSStringLocalizedFormatKey
        %#@series@
        series
        
            NSStringFormatSpecTypeKey
            NSStringPluralRuleType
            NSStringFormatValueTypeKey
            ld
            one
            %ld Serie
            other
            %ld Serien
        
    

Note that the proper format specifier for Int (which can be a 32-bit or 64-bit integer) is %ld.

Now everything works "automatically", with no changes in the Swift code:

for n in 1...3 {
    let str = String(format: NSLocalizedString("%ld series", comment: ""), n)
    print(str)
}

Output:

1 Serie
2 Serien
3 Serien

Even if more languages with other plural rules are added, no changes in the Swift code are necessary.