I'm working on a project that requires a three letter (ISO 639-2) language code to access a REST service. I was hoping to use the current language setting using [[NSLocale currentLocale] objectForKey:NSLocaleLanguageCode]. Unfortunately, this method prefers to return two letter (ISO 639-1) language codes. Is there a way I can force NSLocale to return the updated codes, or is there another method I can use to convert a two letter language code to a three letter language code?
Always get ISO 639-2 (three character) language code in iOS?
Asked Answered
No, you cannot do that. You have to convert them manually and this is not very simple.
If such a conversion exists, I don't see how it would be any more complex than using a simple mapping table. –
Kirovograd
depends on the size of the table and the format of the input data, which btw is not quite 639-1 –
Geer
If I understand Apple's documentation correctly, it will return 639-2 codes if a 639-1 code does not exist for the current language. I've found a full list of codes here: loc.gov/standards/iso639-2/php/code_list.php While a lookup table certainly seems possible, it would be tedious and that many string comparisons would be expensive. I really wish they would do it server-side. –
Slavism
Check my code at Github for a category on NSLocale to get an ISO 639.2 language code. It is as simple as:
[[NSLocale currentLocale] ISO639_2LanguageIdentifier];
No, you cannot do that. You have to convert them manually and this is not very simple.
If such a conversion exists, I don't see how it would be any more complex than using a simple mapping table. –
Kirovograd
depends on the size of the table and the format of the input data, which btw is not quite 639-1 –
Geer
If I understand Apple's documentation correctly, it will return 639-2 codes if a 639-1 code does not exist for the current language. I've found a full list of codes here: loc.gov/standards/iso639-2/php/code_list.php While a lookup table certainly seems possible, it would be tedious and that many string comparisons would be expensive. I really wish they would do it server-side. –
Slavism
It's really basic, but I wrote this class to serve my needs:
class CountryUtilities {
class func getAlphaThreeCode(byAlpha2Code alpha2code: String) -> String? {
return countries[alpha2code]
}
private static let countries: [String: String] = [
"AF": "AFG",
"AX": "ALA",
"AL": "ALB",
"DZ": "DZA",
"AS": "ASM",
"AD": "AND",
"AO": "AGO",
"AI": "AIA",
"AQ": "ATA",
"AG": "ATG",
"AR": "ARG",
"AM": "ARM",
"AW": "ABW",
"AU": "AUS",
"AT": "AUT",
"AZ": "AZE",
"BS": "BHS",
"BH": "BHR",
"BD": "BGD",
"BB": "BRB",
"BY": "BLR",
"BE": "BEL",
"BZ": "BLZ",
"BJ": "BEN",
"BM": "BMU",
"BT": "BTN",
"BO": "BOL",
"BQ": "BES",
"BA": "BIH",
"BW": "BWA",
"BV": "BVT",
"BR": "BRA",
"IO": "IOT",
"BN": "BRN",
"BG": "BGR",
"BF": "BFA",
"BI": "BDI",
"CV": "CPV",
"KH": "KHM",
"CM": "CMR",
"CA": "CAN",
"KY": "CYM",
"CF": "CAF",
"TD": "TCD",
"CL": "CHL",
"CN": "CHN",
"CX": "CXR",
"CC": "CCK",
"CO": "COL",
"KM": "COM",
"CG": "COG",
"CD": "COD",
"CK": "COK",
"CR": "CRI",
"CI": "CIV",
"HR": "HRV",
"CU": "CUB",
"CW": "CUW",
"CY": "CYP",
"CZ": "CZE",
"DK": "DNK",
"DJ": "DJI",
"DM": "DMA",
"DO": "DOM",
"EC": "ECU",
"EG": "EGY",
"SV": "SLV",
"GQ": "GNQ",
"ER": "ERI",
"EE": "EST",
"SZ": "SWZ",
"ET": "ETH",
"FK": "FLK",
"FO": "FRO",
"FJ": "FJI",
"FI": "FIN",
"FR": "FRA",
"GF": "GUF",
"PF": "PYF",
"TF": "ATF",
"GA": "GAB",
"GM": "GMB",
"GE": "GEO",
"DE": "DEU",
"GH": "GHA",
"GI": "GIB",
"GR": "GRC",
"GL": "GRL",
"GD": "GRD",
"GP": "GLP",
"GU": "GUM",
"GT": "GTM",
"GG": "GGY",
"GN": "GIN",
"GW": "GNB",
"GY": "GUY",
"HT": "HTI",
"HM": "HMD",
"VA": "VAT",
"HN": "HND",
"HK": "HKG",
"HU": "HUN",
"IS": "ISL",
"IN": "IND",
"ID": "IDN",
"IR": "IRN",
"IQ": "IRQ",
"IE": "IRL",
"IM": "IMN",
"IL": "ISR",
"IT": "ITA",
"JM": "JAM",
"JP": "JPN",
"JE": "JEY",
"JO": "JOR",
"KZ": "KAZ",
"KE": "KEN",
"KI": "KIR",
"KP": "PRK",
"KR": "KOR",
"KW": "KWT",
"KG": "KGZ",
"LA": "LAO",
"LV": "LVA",
"LB": "LBN",
"LS": "LSO",
"LR": "LBR",
"LY": "LBY",
"LI": "LIE",
"LT": "LTU",
"LU": "LUX",
"MO": "MAC",
"MK": "MKD",
"MG": "MDG",
"MW": "MWI",
"MY": "MYS",
"MV": "MDV",
"ML": "MLI",
"MT": "MLT",
"MH": "MHL",
"MQ": "MTQ",
"MR": "MRT",
"MU": "MUS",
"YT": "MYT",
"MX": "MEX",
"FM": "FSM",
"MD": "MDA",
"MC": "MCO",
"MN": "MNG",
"ME": "MNE",
"MS": "MSR",
"MA": "MAR",
"MZ": "MOZ",
"MM": "MMR",
"NA": "NAM",
"NR": "NRU",
"NP": "NPL",
"NL": "NLD",
"NC": "NCL",
"NZ": "NZL",
"NI": "NIC",
"NE": "NER",
"NG": "NGA",
"NU": "NIU",
"NF": "NFK",
"MP": "MNP",
"NO": "NOR",
"OM": "OMN",
"PK": "PAK",
"PW": "PLW",
"PS": "PSE",
"PA": "PAN",
"PG": "PNG",
"PY": "PRY",
"PE": "PER",
"PH": "PHL",
"PN": "PCN",
"PL": "POL",
"PT": "PRT",
"PR": "PRI",
"QA": "QAT",
"RE": "REU",
"RO": "ROU",
"RU": "RUS",
"RW": "RWA",
"BL": "BLM",
"SH": "SHN",
"KN": "KNA",
"LC": "LCA",
"MF": "MAF",
"PM": "SPM",
"VC": "VCT",
"WS": "WSM",
"SM": "SMR",
"ST": "STP",
"SA": "SAU",
"SN": "SEN",
"RS": "SRB",
"SC": "SYC",
"SL": "SLE",
"SG": "SGP",
"SX": "SXM",
"SK": "SVK",
"SI": "SVN",
"SB": "SLB",
"SO": "SOM",
"ZA": "ZAF",
"GS": "SGS",
"SS": "SSD",
"ES": "ESP",
"LK": "LKA",
"SD": "SDN",
"SR": "SUR",
"SJ": "SJM",
"SE": "SWE",
"CH": "CHE",
"SY": "SYR",
"TW": "TWN",
"TJ": "TJK",
"TZ": "TZA",
"TH": "THA",
"TL": "TLS",
"TG": "TGO",
"TK": "TKL",
"TO": "TON",
"TT": "TTO",
"TN": "TUN",
"TR": "TUR",
"TM": "TKM",
"TC": "TCA",
"TV": "TUV",
"UG": "UGA",
"UA": "UKR",
"AE": "ARE",
"GB": "GBR",
"US": "USA",
"UM": "UMI",
"UY": "URY",
"UZ": "UZB",
"VU": "VUT",
"VE": "VEN",
"VN": "VNM",
"VG": "VGB",
"VI": "VIR",
"WF": "WLF",
"EH": "ESH",
"YE": "YEM",
"ZM": "ZMB",
"ZW": "ZWE"
]
}I needed a similar conversion for ISO 3166-1 countrycodes. iOS gave me the 2-letter code, but I needed the 3 letter code. Here is my solution:
- Find a resource file/API to get the ISO countries from. (for example here: https://github.com/lukes/ISO-3166-Countries-with-Regional-Codes/tree/master/all)
- Lookup the 2-letter code and convert it to the matching 3-letter code.
Some example code (given you have a iso-countries.json file in the format of lukes GIT project above)
import UIKit
import CoreTelephony
class CountryCode {
internal var _countries: [String: [AnyHashable: Any]]?
internal var countries: [String: [AnyHashable: Any]]? {
get {
if _countries == nil {
_countries = countriesDictionary()
}
return _countries
}
}
func convertToThreeCharacterCountryCode(twoCharacterCountryCode: String) -> String? {
let country = countries?[twoCharacterCountryCode.uppercased()]
return country?["alpha-3"] as? String
}
fileprivate func countriesDictionary() -> [String: [AnyHashable: Any]] {
var countries = [String: [AnyHashable: Any]]()
guard let url = Bundle.main.url(forResource: "iso-countries", withExtension: "json") else {
return countries
}
do {
let data = try Data(contentsOf: url)
if let dictionaries = try JSONSerialization.jsonObject(with: data, options: []) as? [[AnyHashable: Any]] {
for countryDictionary in dictionaries {
if let key = countryDictionary["alpha-2"] as? String {
countries[key] = countryDictionary
}
}
return countries
}
return countries
} catch {
return countries
}
}
}
You can consider making this a Singleton class, so the countries only have to load once. I did not as I didn't want to keep the countries in memory (in my app this was only needed once during startup).
In Swift it's as simple as this:
let currentLocale = NSLocale.current as? NSLocale
let code = currentLocale?.iso639_2LanguageCode()
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