AppDelegate.m

    PSPDFSetLocalizationBlock(^NSString *(NSString *stringToLocalize) {
        // This will look up strings in language/PSPDFKit.strings inside your resource folder.
        return NSLocalizedStringFromTable(stringToLocalize, @"PSPDFKit", nil);

        // You can also route translation through your default localization:
        return NSLocalizedString(stringToLocalize, nil);

        // Or use a custom variant, for example to test if everything is localized:
        // Please keep in mind that several strings like "Edit" are provided by the system and automatically translated, provided that you have the correct localization resources set.
        return [NSString stringWithFormat:@"_____%@_____", stringToLocalize];
    });