受け入れられた回答は、いくつかのかなり重要なロケールを見逃しています。たとえば、中国語のロケールは異なる経典（簡体字、繁体字）を区別しません。伝統的な漢民族を使うことを望んでいる中国本土の市民は何ですか-香港の設定ですか？
私はこのiOSロケールのリストを取得し、奇妙なPOSIXエントリを削除し、JavaScriptとしてフォーマットし、値でソートしました（したがって、順序付けされたオブジェクト実装を使用し、キーを通過して値を返すことでリストを作成すると、人間が読めるテキストを正しい順序で表示します）。また、このリストには、言語ごとのメインエントリとすべての地域固有のバリアントが含まれます-このように、指定されたフォールバックオプションが常にあります。たとえば、インターフェースに「en」オプションのみが定義されている場合は、他の方法ではわかりません。確実にフォールバックするもの。
var LANGUAGE_BY_LOCALE = {
af_NA: "Afrikaans (Namibia)",
af_ZA: "Afrikaans (South Africa)",
af: "Afrikaans",
ak_GH: "Akan (Ghana)",
ak: "Akan",
sq_AL: "Albanian (Albania)",
sq: "Albanian",
am_ET: "Amharic (Ethiopia)",
am: "Amharic",
ar_DZ: "Arabic (Algeria)",
ar_BH: "Arabic (Bahrain)",
ar_EG: "Arabic (Egypt)",
ar_IQ: "Arabic (Iraq)",
ar_JO: "Arabic (Jordan)",
ar_KW: "Arabic (Kuwait)",
ar_LB: "Arabic (Lebanon)",
ar_LY: "Arabic (Libya)",
ar_MA: "Arabic (Morocco)",
ar_OM: "Arabic (Oman)",
ar_QA: "Arabic (Qatar)",
ar_SA: "Arabic (Saudi Arabia)",
ar_SD: "Arabic (Sudan)",
ar_SY: "Arabic (Syria)",
ar_TN: "Arabic (Tunisia)",
ar_AE: "Arabic (United Arab Emirates)",
ar_YE: "Arabic (Yemen)",
ar: "Arabic",
hy_AM: "Armenian (Armenia)",
hy: "Armenian",
as_IN: "Assamese (India)",
as: "Assamese",
asa_TZ: "Asu (Tanzania)",
asa: "Asu",
az_Cyrl: "Azerbaijani (Cyrillic)",
az_Cyrl_AZ: "Azerbaijani (Cyrillic, Azerbaijan)",
az_Latn: "Azerbaijani (Latin)",
az_Latn_AZ: "Azerbaijani (Latin, Azerbaijan)",
az: "Azerbaijani",
bm_ML: "Bambara (Mali)",
bm: "Bambara",
eu_ES: "Basque (Spain)",
eu: "Basque",
be_BY: "Belarusian (Belarus)",
be: "Belarusian",
bem_ZM: "Bemba (Zambia)",
bem: "Bemba",
bez_TZ: "Bena (Tanzania)",
bez: "Bena",
bn_BD: "Bengali (Bangladesh)",
bn_IN: "Bengali (India)",
bn: "Bengali",
bs_BA: "Bosnian (Bosnia and Herzegovina)",
bs: "Bosnian",
bg_BG: "Bulgarian (Bulgaria)",
bg: "Bulgarian",
my_MM: "Burmese (Myanmar [Burma])",
my: "Burmese",
yue_Hant_HK: "Cantonese (Traditional, Hong Kong SAR China)",
ca_ES: "Catalan (Spain)",
ca: "Catalan",
tzm_Latn: "Central Morocco Tamazight (Latin)",
tzm_Latn_MA: "Central Morocco Tamazight (Latin, Morocco)",
tzm: "Central Morocco Tamazight",
chr_US: "Cherokee (United States)",
chr: "Cherokee",
cgg_UG: "Chiga (Uganda)",
cgg: "Chiga",
zh_Hans: "Chinese (Simplified Han)",
zh_Hans_CN: "Chinese (Simplified Han, China)",
zh_Hans_HK: "Chinese (Simplified Han, Hong Kong SAR China)",
zh_Hans_MO: "Chinese (Simplified Han, Macau SAR China)",
zh_Hans_SG: "Chinese (Simplified Han, Singapore)",
zh_Hant: "Chinese (Traditional Han)",
zh_Hant_HK: "Chinese (Traditional Han, Hong Kong SAR China)",
zh_Hant_MO: "Chinese (Traditional Han, Macau SAR China)",
zh_Hant_TW: "Chinese (Traditional Han, Taiwan)",
zh: "Chinese",
kw_GB: "Cornish (United Kingdom)",
kw: "Cornish",
hr_HR: "Croatian (Croatia)",
hr: "Croatian",
cs_CZ: "Czech (Czech Republic)",
cs: "Czech",
da_DK: "Danish (Denmark)",
da: "Danish",
nl_BE: "Dutch (Belgium)",
nl_NL: "Dutch (Netherlands)",
nl: "Dutch",
ebu_KE: "Embu (Kenya)",
ebu: "Embu",
en_AS: "English (American Samoa)",
en_AU: "English (Australia)",
en_BE: "English (Belgium)",
en_BZ: "English (Belize)",
en_BW: "English (Botswana)",
en_CA: "English (Canada)",
en_GU: "English (Guam)",
en_HK: "English (Hong Kong SAR China)",
en_IN: "English (India)",
en_IE: "English (Ireland)",
en_IL: "English (Israel)",
en_JM: "English (Jamaica)",
en_MT: "English (Malta)",
en_MH: "English (Marshall Islands)",
en_MU: "English (Mauritius)",
en_NA: "English (Namibia)",
en_NZ: "English (New Zealand)",
en_MP: "English (Northern Mariana Islands)",
en_PK: "English (Pakistan)",
en_PH: "English (Philippines)",
en_SG: "English (Singapore)",
en_ZA: "English (South Africa)",
en_TT: "English (Trinidad and Tobago)",
en_UM: "English (U.S. Minor Outlying Islands)",
en_VI: "English (U.S. Virgin Islands)",
en_GB: "English (United Kingdom)",
en_US: "English (United States)",
en_ZW: "English (Zimbabwe)",
en: "English",
eo: "Esperanto",
et_EE: "Estonian (Estonia)",
et: "Estonian",
ee_GH: "Ewe (Ghana)",
ee_TG: "Ewe (Togo)",
ee: "Ewe",
fo_FO: "Faroese (Faroe Islands)",
fo: "Faroese",
fil_PH: "Filipino (Philippines)",
fil: "Filipino",
fi_FI: "Finnish (Finland)",
fi: "Finnish",
fr_BE: "French (Belgium)",
fr_BJ: "French (Benin)",
fr_BF: "French (Burkina Faso)",
fr_BI: "French (Burundi)",
fr_CM: "French (Cameroon)",
fr_CA: "French (Canada)",
fr_CF: "French (Central African Republic)",
fr_TD: "French (Chad)",
fr_KM: "French (Comoros)",
fr_CG: "French (Congo - Brazzaville)",
fr_CD: "French (Congo - Kinshasa)",
fr_CI: "French (Côte d’Ivoire)",
fr_DJ: "French (Djibouti)",
fr_GQ: "French (Equatorial Guinea)",
fr_FR: "French (France)",
fr_GA: "French (Gabon)",
fr_GP: "French (Guadeloupe)",
fr_GN: "French (Guinea)",
fr_LU: "French (Luxembourg)",
fr_MG: "French (Madagascar)",
fr_ML: "French (Mali)",
fr_MQ: "French (Martinique)",
fr_MC: "French (Monaco)",
fr_NE: "French (Niger)",
fr_RW: "French (Rwanda)",
fr_RE: "French (Réunion)",
fr_BL: "French (Saint Barthélemy)",
fr_MF: "French (Saint Martin)",
fr_SN: "French (Senegal)",
fr_CH: "French (Switzerland)",
fr_TG: "French (Togo)",
fr: "French",
ff_SN: "Fulah (Senegal)",
ff: "Fulah",
gl_ES: "Galician (Spain)",
gl: "Galician",
lg_UG: "Ganda (Uganda)",
lg: "Ganda",
ka_GE: "Georgian (Georgia)",
ka: "Georgian",
de_AT: "German (Austria)",
de_BE: "German (Belgium)",
de_DE: "German (Germany)",
de_LI: "German (Liechtenstein)",
de_LU: "German (Luxembourg)",
de_CH: "German (Switzerland)",
de: "German",
el_CY: "Greek (Cyprus)",
el_GR: "Greek (Greece)",
el: "Greek",
gu_IN: "Gujarati (India)",
gu: "Gujarati",
guz_KE: "Gusii (Kenya)",
guz: "Gusii",
ha_Latn: "Hausa (Latin)",
ha_Latn_GH: "Hausa (Latin, Ghana)",
ha_Latn_NE: "Hausa (Latin, Niger)",
ha_Latn_NG: "Hausa (Latin, Nigeria)",
ha: "Hausa",
haw_US: "Hawaiian (United States)",
haw: "Hawaiian",
he_IL: "Hebrew (Israel)",
he: "Hebrew",
hi_IN: "Hindi (India)",
hi: "Hindi",
hu_HU: "Hungarian (Hungary)",
hu: "Hungarian",
is_IS: "Icelandic (Iceland)",
is: "Icelandic",
ig_NG: "Igbo (Nigeria)",
ig: "Igbo",
id_ID: "Indonesian (Indonesia)",
id: "Indonesian",
ga_IE: "Irish (Ireland)",
ga: "Irish",
it_IT: "Italian (Italy)",
it_CH: "Italian (Switzerland)",
it: "Italian",
ja_JP: "Japanese (Japan)",
ja: "Japanese",
kea_CV: "Kabuverdianu (Cape Verde)",
kea: "Kabuverdianu",
kab_DZ: "Kabyle (Algeria)",
kab: "Kabyle",
kl_GL: "Kalaallisut (Greenland)",
kl: "Kalaallisut",
kln_KE: "Kalenjin (Kenya)",
kln: "Kalenjin",
kam_KE: "Kamba (Kenya)",
kam: "Kamba",
kn_IN: "Kannada (India)",
kn: "Kannada",
kk_Cyrl: "Kazakh (Cyrillic)",
kk_Cyrl_KZ: "Kazakh (Cyrillic, Kazakhstan)",
kk: "Kazakh",
km_KH: "Khmer (Cambodia)",
km: "Khmer",
ki_KE: "Kikuyu (Kenya)",
ki: "Kikuyu",
rw_RW: "Kinyarwanda (Rwanda)",
rw: "Kinyarwanda",
kok_IN: "Konkani (India)",
kok: "Konkani",
ko_KR: "Korean (South Korea)",
ko: "Korean",
khq_ML: "Koyra Chiini (Mali)",
khq: "Koyra Chiini",
ses_ML: "Koyraboro Senni (Mali)",
ses: "Koyraboro Senni",
lag_TZ: "Langi (Tanzania)",
lag: "Langi",
lv_LV: "Latvian (Latvia)",
lv: "Latvian",
lt_LT: "Lithuanian (Lithuania)",
lt: "Lithuanian",
luo_KE: "Luo (Kenya)",
luo: "Luo",
luy_KE: "Luyia (Kenya)",
luy: "Luyia",
mk_MK: "Macedonian (Macedonia)",
mk: "Macedonian",
jmc_TZ: "Machame (Tanzania)",
jmc: "Machame",
kde_TZ: "Makonde (Tanzania)",
kde: "Makonde",
mg_MG: "Malagasy (Madagascar)",
mg: "Malagasy",
ms_BN: "Malay (Brunei)",
ms_MY: "Malay (Malaysia)",
ms: "Malay",
ml_IN: "Malayalam (India)",
ml: "Malayalam",
mt_MT: "Maltese (Malta)",
mt: "Maltese",
gv_GB: "Manx (United Kingdom)",
gv: "Manx",
mr_IN: "Marathi (India)",
mr: "Marathi",
mas_KE: "Masai (Kenya)",
mas_TZ: "Masai (Tanzania)",
mas: "Masai",
mer_KE: "Meru (Kenya)",
mer: "Meru",
mfe_MU: "Morisyen (Mauritius)",
mfe: "Morisyen",
naq_NA: "Nama (Namibia)",
naq: "Nama",
ne_IN: "Nepali (India)",
ne_NP: "Nepali (Nepal)",
ne: "Nepali",
nd_ZW: "North Ndebele (Zimbabwe)",
nd: "North Ndebele",
nb_NO: "Norwegian Bokmål (Norway)",
nb: "Norwegian Bokmål",
nn_NO: "Norwegian Nynorsk (Norway)",
nn: "Norwegian Nynorsk",
nyn_UG: "Nyankole (Uganda)",
nyn: "Nyankole",
or_IN: "Oriya (India)",
or: "Oriya",
om_ET: "Oromo (Ethiopia)",
om_KE: "Oromo (Kenya)",
om: "Oromo",
ps_AF: "Pashto (Afghanistan)",
ps: "Pashto",
fa_AF: "Persian (Afghanistan)",
fa_IR: "Persian (Iran)",
fa: "Persian",
pl_PL: "Polish (Poland)",
pl: "Polish",
pt_BR: "Portuguese (Brazil)",
pt_GW: "Portuguese (Guinea-Bissau)",
pt_MZ: "Portuguese (Mozambique)",
pt_PT: "Portuguese (Portugal)",
pt: "Portuguese",
pa_Arab: "Punjabi (Arabic)",
pa_Arab_PK: "Punjabi (Arabic, Pakistan)",
pa_Guru: "Punjabi (Gurmukhi)",
pa_Guru_IN: "Punjabi (Gurmukhi, India)",
pa: "Punjabi",
ro_MD: "Romanian (Moldova)",
ro_RO: "Romanian (Romania)",
ro: "Romanian",
rm_CH: "Romansh (Switzerland)",
rm: "Romansh",
rof_TZ: "Rombo (Tanzania)",
rof: "Rombo",
ru_MD: "Russian (Moldova)",
ru_RU: "Russian (Russia)",
ru_UA: "Russian (Ukraine)",
ru: "Russian",
rwk_TZ: "Rwa (Tanzania)",
rwk: "Rwa",
saq_KE: "Samburu (Kenya)",
saq: "Samburu",
sg_CF: "Sango (Central African Republic)",
sg: "Sango",
seh_MZ: "Sena (Mozambique)",
seh: "Sena",
sr_Cyrl: "Serbian (Cyrillic)",
sr_Cyrl_BA: "Serbian (Cyrillic, Bosnia and Herzegovina)",
sr_Cyrl_ME: "Serbian (Cyrillic, Montenegro)",
sr_Cyrl_RS: "Serbian (Cyrillic, Serbia)",
sr_Latn: "Serbian (Latin)",
sr_Latn_BA: "Serbian (Latin, Bosnia and Herzegovina)",
sr_Latn_ME: "Serbian (Latin, Montenegro)",
sr_Latn_RS: "Serbian (Latin, Serbia)",
sr: "Serbian",
sn_ZW: "Shona (Zimbabwe)",
sn: "Shona",
ii_CN: "Sichuan Yi (China)",
ii: "Sichuan Yi",
si_LK: "Sinhala (Sri Lanka)",
si: "Sinhala",
sk_SK: "Slovak (Slovakia)",
sk: "Slovak",
sl_SI: "Slovenian (Slovenia)",
sl: "Slovenian",
xog_UG: "Soga (Uganda)",
xog: "Soga",
so_DJ: "Somali (Djibouti)",
so_ET: "Somali (Ethiopia)",
so_KE: "Somali (Kenya)",
so_SO: "Somali (Somalia)",
so: "Somali",
es_AR: "Spanish (Argentina)",
es_BO: "Spanish (Bolivia)",
es_CL: "Spanish (Chile)",
es_CO: "Spanish (Colombia)",
es_CR: "Spanish (Costa Rica)",
es_DO: "Spanish (Dominican Republic)",
es_EC: "Spanish (Ecuador)",
es_SV: "Spanish (El Salvador)",
es_GQ: "Spanish (Equatorial Guinea)",
es_GT: "Spanish (Guatemala)",
es_HN: "Spanish (Honduras)",
es_419: "Spanish (Latin America)",
es_MX: "Spanish (Mexico)",
es_NI: "Spanish (Nicaragua)",
es_PA: "Spanish (Panama)",
es_PY: "Spanish (Paraguay)",
es_PE: "Spanish (Peru)",
es_PR: "Spanish (Puerto Rico)",
es_ES: "Spanish (Spain)",
es_US: "Spanish (United States)",
es_UY: "Spanish (Uruguay)",
es_VE: "Spanish (Venezuela)",
es: "Spanish",
sw_KE: "Swahili (Kenya)",
sw_TZ: "Swahili (Tanzania)",
sw: "Swahili",
sv_FI: "Swedish (Finland)",
sv_SE: "Swedish (Sweden)",
sv: "Swedish",
gsw_CH: "Swiss German (Switzerland)",
gsw: "Swiss German",
shi_Latn: "Tachelhit (Latin)",
shi_Latn_MA: "Tachelhit (Latin, Morocco)",
shi_Tfng: "Tachelhit (Tifinagh)",
shi_Tfng_MA: "Tachelhit (Tifinagh, Morocco)",
shi: "Tachelhit",
dav_KE: "Taita (Kenya)",
dav: "Taita",
ta_IN: "Tamil (India)",
ta_LK: "Tamil (Sri Lanka)",
ta: "Tamil",
te_IN: "Telugu (India)",
te: "Telugu",
teo_KE: "Teso (Kenya)",
teo_UG: "Teso (Uganda)",
teo: "Teso",
th_TH: "Thai (Thailand)",
th: "Thai",
bo_CN: "Tibetan (China)",
bo_IN: "Tibetan (India)",
bo: "Tibetan",
ti_ER: "Tigrinya (Eritrea)",
ti_ET: "Tigrinya (Ethiopia)",
ti: "Tigrinya",
to_TO: "Tonga (Tonga)",
to: "Tonga",
tr_TR: "Turkish (Turkey)",
tr: "Turkish",
uk_UA: "Ukrainian (Ukraine)",
uk: "Ukrainian",
ur_IN: "Urdu (India)",
ur_PK: "Urdu (Pakistan)",
ur: "Urdu",
uz_Arab: "Uzbek (Arabic)",
uz_Arab_AF: "Uzbek (Arabic, Afghanistan)",
uz_Cyrl: "Uzbek (Cyrillic)",
uz_Cyrl_UZ: "Uzbek (Cyrillic, Uzbekistan)",
uz_Latn: "Uzbek (Latin)",
uz_Latn_UZ: "Uzbek (Latin, Uzbekistan)",
uz: "Uzbek",
vi_VN: "Vietnamese (Vietnam)",
vi: "Vietnamese",
vun_TZ: "Vunjo (Tanzania)",
vun: "Vunjo",
cy_GB: "Welsh (United Kingdom)",
cy: "Welsh",
yo_NG: "Yoruba (Nigeria)",
yo: "Yoruba",
zu_ZA: "Zulu (South Africa)",
zu: "Zulu"
}