How do I get a list of countries in Swift ios?

问题:

I've already seen two similar questions to mine, but the answers for those questions do not work for me. I have an old project with a list of countries manually typed out inside a set of square brackets.

I can easily use this in my pickerView but I'm wondering if there is a more efficient way to do this?

I will be using the list of countries in a UIPickerView.

回答1:

You can get a list of countries using the NSLocale class's isoCountryCodes which returns an array of [String]. From there, you get the country name by using NSLocale's displayName(forKey:) method. It looks like this:

var countries: [String] = []

for code in NSLocale.isoCountryCodes  {
    let id = NSLocale.localeIdentifier(fromComponents: [NSLocale.Key.countryCode.rawValue: code])
    let name = NSLocale(localeIdentifier: "en_UK").displayName(forKey: NSLocale.Key.identifier, value: id) ?? "Country not found for code: \(code)"
    countries.append(name)
}

print(countries)

回答2:

SWIFT 3 and 4

var countries: [String] = []

for code in NSLocale.isoCountryCodes as [String] {
    let id = NSLocale.localeIdentifier(fromComponents: [NSLocale.Key.countryCode.rawValue: code])
    let name = NSLocale(localeIdentifier: "en_UK").displayName(forKey: NSLocale.Key.identifier, value: id) ?? "Country not found for code: \(code)"
    countries.append(name)
}

print(countries)

回答3:

Same as Ian's but shorter

let countries = NSLocale.ISOCountryCodes().map { (code:String) -> String in
  let id = NSLocale.localeIdentifierFromComponents([NSLocaleCountryCode: code])
  return NSLocale(localeIdentifier: "en_US").displayNameForKey(NSLocaleIdentifier, value: id) ?? "Country not found for code: \(code)"
}

print(countries)

回答4:

Swift 4.2

let languageList = Locale.isoLanguageCodes.compactMap { Locale.current.localizedString(forLanguageCode: $0) }
let countryList = Locale.isoRegionCodes.compactMap { Locale.current.localizedString(forRegionCode: $0) }

回答5:

Here is @vedo27 's answer in Swift 3

 let countries = NSLocale.isoCountryCodes.map { (code:String) -> String in
    let id = NSLocale.localeIdentifier(fromComponents: [NSLocale.Key.countryCode.rawValue: code])
    return NSLocale(localeIdentifier: "en_US").displayName(forKey: NSLocale.Key.identifier, value: id) ?? "Country not found for code: \(code)"
}

回答6:

also it is a good practise to localize the displayed name of countries. So in addition to vedo27 answer it would be:

let countriesArray = NSLocale.ISOCountryCodes().map { (code:String) -> String in
        let id = NSLocale.localeIdentifierFromComponents([NSLocaleCountryCode: code])
        let currentLocaleID = NSLocale.currentLocale().localeIdentifier
        return NSLocale(localeIdentifier: currentLocaleID).displayNameForKey(NSLocaleIdentifier, value: id) ?? "Country not found for code: \(code)"
    }

回答7:

Swift 3 declared as a var:

var countries: [String] {
    let myLanguageId = "en" // in which language I want to show the list
    return NSLocale.isoCountryCodes.map {
        return NSLocale(localeIdentifier: myLanguageId).localizedString(forCountryCode: $0) ?? $0
    }
}

回答8:

SWIFT 4

Here is an elegant way of doing it in Swift 4

var countries: [String] = {

    var arrayOfCountries: [String] = []

    for code in NSLocale.isoCountryCodes as [String] {
        let id = NSLocale.localeIdentifier(fromComponents: [NSLocale.Key.countryCode.rawValue: code])
        let name = NSLocale(localeIdentifier: "en_UK").displayName(forKey: NSLocale.Key.identifier, value: id) ?? "Country not found for code: \(code)"
        arrayOfCountries.append(name)
    }

    return arrayOfCountries
}()

回答9:

Swift You can easily retrieve countries name and their flags emoji.

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        var countriesData = [(name: String, flag: String)]()

        for code in NSLocale.isoCountryCodes  {

            let flag = String.emojiFlag(for: code)
            let id = NSLocale.localeIdentifier(fromComponents: [NSLocale.Key.countryCode.rawValue: code])

            if let name = NSLocale(localeIdentifier: "en_UK").displayName(forKey: NSLocale.Key.identifier, value: id) {
                countriesData.append((name: name, flag: flag!))
            }else{
                 //"Country not found for code: \(code)"
            }
        }

        print(countriesData)
    }
}


extension String {

    static func emojiFlag(for countryCode: String) -> String! {
        func isLowercaseASCIIScalar(_ scalar: Unicode.Scalar) -> Bool {
            return scalar.value >= 0x61 && scalar.value <= 0x7A
        }

        func regionalIndicatorSymbol(for scalar: Unicode.Scalar) -> Unicode.Scalar {
            precondition(isLowercaseASCIIScalar(scalar))

            // 0x1F1E6 marks the start of the Regional Indicator Symbol range and corresponds to 'A'
            // 0x61 marks the start of the lowercase ASCII alphabet: 'a'
            return Unicode.Scalar(scalar.value + (0x1F1E6 - 0x61))!
        }

        let lowercasedCode = countryCode.lowercased()
        guard lowercasedCode.count == 2 else { return nil }
        guard lowercasedCode.unicodeScalars.reduce(true, { accum, scalar in accum && isLowercaseASCIIScalar(scalar) }) else { return nil }

        let indicatorSymbols = lowercasedCode.unicodeScalars.map({ regionalIndicatorSymbol(for: $0) })
        return String(indicatorSymbols.map({ Character($0) }))
    }
}

Result:

回答10:

Alternatively, you can have it in swift 4 and localized by the system language.

import Foundation

struct Country {
  let name: String
  let code: String
}

final class CountryHelper {
  class func allCountries() -> [Country] {
    var countries = [Country]()

    for code in Locale.isoRegionCodes as [String] {
      if let name = Locale.autoupdatingCurrent.localizedString(forRegionCode: code) {
        countries.append(Country(name: name, code: code))
      }
    }

    return countries
  }
}

回答11:

Update to vedo27's answer but in Swift 5:

let countries : [String] = NSLocale.isoCountryCodes.map { (code:String) -> String in
        let id = NSLocale.localeIdentifier(fromComponents: [NSLocale.Key.countryCode.rawValue: code])
        return NSLocale(localeIdentifier: "en_US").displayName(forKey: NSLocale.Key.identifier, value: id) ?? "Country not found for code: \(code)"
    }

Also for having a sorted array for countries in Alphabetical order add this below in your order after fetching countries list

let sortedcountries = countries.sorted { $0 < $1 }