Quick snippet to get all the Alpha-2 ISO country code as well as they localized display name, using native Swift lib (no imported external enums/manual entries).

CountryCodes.swift

var countries: [String:String] = [:]
for code in NSLocale.isoCountryCodes {
    let id: String = Locale.identifier(fromComponents: [
        NSLocale.Key.countryCode.rawValue : code
    ])
    guard let name = (Locale.current as NSLocale).displayName(forKey: .identifier, value: id) else { continue }
    countries[code] = name
}

for (index, countryCode) in countries.keys.sorted(by: { countries[$0]! < countries[$1]! }).enumerated() {
    print("\(index + 1): \(countryCode) \(countries[countryCode]!)")
}

// This will produce the following output:

1: AF Afghanistan
2: AL Albania
3: DZ Algeria
4: AS American Samoa
5: AD Andorra
6: AO Angola
7: AI Anguilla
8: AQ Antarctica
9: AG Antigua & Barbuda
10: AR Argentina
11: AM Armenia
12: AW Aruba
13: AC Ascension Island
14: AU Australia
15: AT Austria
16: AZ Azerbaijan
17: BS Bahamas
18: BH Bahrain
19: BD Bangladesh
20: BB Barbados
21: BY Belarus
22: BE Belgium
23: BZ Belize
24: BJ Benin
25: BM Bermuda
26: BT Bhutan
27: BO Bolivia
28: BA Bosnia & Herzegovina
29: BW Botswana
30: BV Bouvet Island
31: BR Brazil
32: IO British Indian Ocean Territory
33: VG British Virgin Islands
34: BN Brunei
35: BG Bulgaria
36: BF Burkina Faso
37: BI Burundi
38: KH Cambodia
39: CM Cameroon
40: CA Canada
41: IC Canary Islands
42: CV Cape Verde
43: BQ Caribbean Netherlands
44: KY Cayman Islands
45: CF Central African Republic
46: EA Ceuta & Melilla
47: TD Chad
48: CL Chile
49: CN China mainland
50: CX Christmas Island
51: CP Clipperton Island
52: CC Cocos [Keeling] Islands
53: CO Colombia
54: KM Comoros
55: CG Congo - Brazzaville
56: CD Congo - Kinshasa
57: CK Cook Islands
58: CR Costa Rica
59: HR Croatia
60: CU Cuba
61: CW Curaçao
62: CY Cyprus
63: CZ Czechia
64: CI Côte d’Ivoire
65: DK Denmark
66: DG Diego Garcia
67: DJ Djibouti
68: DM Dominica
69: DO Dominican Republic
70: EC Ecuador
71: EG Egypt
72: SV El Salvador
73: GQ Equatorial Guinea
74: ER Eritrea
75: EE Estonia
76: SZ Eswatini
77: ET Ethiopia
78: FK Falkland Islands
79: FO Faroe Islands
80: FJ Fiji
81: FI Finland
82: FR France
83: GF French Guiana
84: PF French Polynesia
85: TF French Southern Territories
86: GA Gabon
87: GM Gambia
88: GE Georgia
89: DE Germany
90: GH Ghana
91: GI Gibraltar
92: GR Greece
93: GL Greenland
94: GD Grenada
95: GP Guadeloupe
96: GU Guam
97: GT Guatemala
98: GG Guernsey
99: GN Guinea
100: GW Guinea-Bissau
101: GY Guyana
102: HT Haiti
103: HM Heard & McDonald Islands
104: HN Honduras
105: HK Hong Kong
106: HU Hungary
107: IS Iceland
108: IN India
109: ID Indonesia
110: IR Iran
111: IQ Iraq
112: IE Ireland
113: IM Isle of Man
114: IL Israel
115: IT Italy
116: JM Jamaica
117: JP Japan
118: JE Jersey
119: JO Jordan
120: KZ Kazakhstan
121: KE Kenya
122: KI Kiribati
123: XK Kosovo
124: KW Kuwait
125: KG Kyrgyzstan
126: LA Laos
127: LV Latvia
128: LB Lebanon
129: LS Lesotho
130: LR Liberia
131: LY Libya
132: LI Liechtenstein
133: LT Lithuania
134: LU Luxembourg
135: MO Macao
136: MG Madagascar
137: MW Malawi
138: MY Malaysia
139: MV Maldives
140: ML Mali
141: MT Malta
142: MH Marshall Islands
143: MQ Martinique
144: MR Mauritania
145: MU Mauritius
146: YT Mayotte
147: MX Mexico
148: FM Micronesia
149: MD Moldova
150: MC Monaco
151: MN Mongolia
152: ME Montenegro
153: MS Montserrat
154: MA Morocco
155: MZ Mozambique
156: MM Myanmar [Burma]
157: NA Namibia
158: NR Nauru
159: NP Nepal
160: NL Netherlands
161: NC New Caledonia
162: NZ New Zealand
163: NI Nicaragua
164: NE Niger
165: NG Nigeria
166: NU Niue
167: NF Norfolk Island
168: KP North Korea
169: MK North Macedonia
170: MP Northern Mariana Islands
171: NO Norway
172: OM Oman
173: PK Pakistan
174: PW Palau
175: PS Palestinian Territories
176: PA Panama
177: PG Papua New Guinea
178: PY Paraguay
179: PE Peru
180: PH Philippines
181: PN Pitcairn Islands
182: PL Poland
183: PT Portugal
184: PR Puerto Rico
185: QA Qatar
186: RO Romania
187: RU Russia
188: RW Rwanda
189: RE Réunion
190: WS Samoa
191: SM San Marino
192: SA Saudi Arabia
193: SN Senegal
194: RS Serbia
195: SC Seychelles
196: SL Sierra Leone
197: SG Singapore
198: SX Sint Maarten
199: SK Slovakia
200: SI Slovenia
201: GS So. Georgia & So. Sandwich Isl.
202: SB Solomon Islands
203: SO Somalia
204: ZA South Africa
205: KR South Korea
206: SS South Sudan
207: ES Spain
208: LK Sri Lanka
209: BL St. Barthélemy
210: SH St. Helena
211: KN St. Kitts & Nevis
212: LC St. Lucia
213: MF St. Martin
214: PM St. Pierre & Miquelon
215: VC St. Vincent & Grenadines
216: SD Sudan
217: SR Suriname
218: SJ Svalbard & Jan Mayen
219: SE Sweden
220: CH Switzerland
221: SY Syria
222: ST São Tomé & Príncipe
223: TW Taiwan
224: TJ Tajikistan
225: TZ Tanzania
226: TH Thailand
227: TL Timor-Leste
228: TG Togo
229: TK Tokelau
230: TO Tonga
231: TT Trinidad & Tobago
232: TA Tristan da Cunha
233: TN Tunisia
234: TR Turkey
235: TM Turkmenistan
236: TC Turks & Caicos Islands
237: TV Tuvalu
238: UM U.S. Outlying Islands
239: VI U.S. Virgin Islands
240: UG Uganda
241: UA Ukraine
242: AE United Arab Emirates
243: GB United Kingdom
244: US United States
245: UY Uruguay
246: UZ Uzbekistan
247: VU Vanuatu
248: VA Vatican City
249: VE Venezuela
250: VN Vietnam
251: WF Wallis & Futuna
252: EH Western Sahara
253: YE Yemen
254: ZM Zambia
255: ZW Zimbabwe
256: AX Åland Islands