小编Yur*_*sov的帖子

- (NSString *)countryNameByCode:(NSString*)countryCode
{
    NSString *identifier = [NSLocale localeIdentifierFromComponents:@{NSLocaleCountryCode: countryCode}];
    NSString *countryName = [[NSLocale currentLocale] displayNameForKey:NSLocaleIdentifier value:identifier];

    return countryName;
}

这回来了nil.为什么？