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Localize.swift
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Localize.swift
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//
// Localize.swift
// Localize
//
// Created by Roy Marmelstein on 05/08/2015.
// Copyright © 2015 Roy Marmelstein. All rights reserved.
//
import Foundation
/// Internal current language key
let LCLCurrentLanguageKey = "LCLCurrentLanguageKey"
/// Default language. English. If English is unavailable defaults to base localization.
let LCLDefaultLanguage = "en"
/// Base bundle as fallback.
let LCLBaseBundle = "Base"
/// Name for language change notification
public let LCLLanguageChangeNotification = "LCLLanguageChangeNotification"
// MARK: Localization Syntax
/**
Swift 1.x friendly localization syntax, replaces NSLocalizedString
- Parameter string: Key to be localized.
- Returns: The localized string.
*/
public func Localized(_ string: String) -> String {
return string.localized()
}
/**
Swift 1.x friendly localization syntax with format arguments, replaces String(format:NSLocalizedString)
- Parameter string: Key to be localized.
- Returns: The formatted localized string with arguments.
*/
public func Localized(_ string: String, arguments: CVarArg...) -> String {
return String(format: string.localized(), arguments: arguments)
}
/**
Swift 1.x friendly plural localization syntax with a format argument
- parameter string: String to be formatted
- parameter argument: Argument to determine pluralisation
- returns: Pluralized localized string.
*/
public func LocalizedPlural(_ string: String, argument: CVarArg) -> String {
return string.localizedPlural(argument)
}
public extension String {
/**
Swift 2 friendly localization syntax, replaces NSLocalizedString
- Returns: The localized string.
*/
func localized() -> String {
return localized(using: nil, in: .main)
}
/**
Swift 2 friendly localization syntax with format arguments, replaces String(format:NSLocalizedString)
- Returns: The formatted localized string with arguments.
*/
func localizedFormat(_ arguments: CVarArg...) -> String {
return String(format: localized(), arguments: arguments)
}
/**
Swift 2 friendly plural localization syntax with a format argument
- parameter argument: Argument to determine pluralisation
- returns: Pluralized localized string.
*/
func localizedPlural(_ argument: CVarArg) -> String {
return NSString.localizedStringWithFormat(localized() as NSString, argument) as String
}
/**
Add comment for NSLocalizedString
- Returns: The localized string.
*/
func commented(_ argument: String) -> String {
return self
}
}
// MARK: Language Setting Functions
open class Localize: NSObject {
/**
List available languages
- Returns: Array of available languages.
*/
open class func availableLanguages(_ excludeBase: Bool = false) -> [String] {
var availableLanguages = Bundle.main.localizations
// If excludeBase = true, don't include "Base" in available languages
if let indexOfBase = availableLanguages.firstIndex(of: "Base") , excludeBase == true {
availableLanguages.remove(at: indexOfBase)
}
return availableLanguages
}
/**
Current language
- Returns: The current language. String.
*/
open class func currentLanguage() -> String {
if let currentLanguage = UserDefaults.standard.object(forKey: LCLCurrentLanguageKey) as? String {
return currentLanguage
}
return defaultLanguage()
}
/**
Change the current language
- Parameter language: Desired language.
*/
open class func setCurrentLanguage(_ language: String) {
let selectedLanguage = availableLanguages().contains(language) ? language : defaultLanguage()
if (selectedLanguage != currentLanguage()){
UserDefaults.standard.set(selectedLanguage, forKey: LCLCurrentLanguageKey)
UserDefaults.standard.synchronize()
NotificationCenter.default.post(name: Notification.Name(rawValue: LCLLanguageChangeNotification), object: nil)
}
}
/**
Default language
- Returns: The app's default language. String.
*/
open class func defaultLanguage() -> String {
var defaultLanguage: String = String()
guard let preferredLanguage = Bundle.main.preferredLocalizations.first else {
return LCLDefaultLanguage
}
let availableLanguages: [String] = self.availableLanguages()
if (availableLanguages.contains(preferredLanguage)) {
defaultLanguage = preferredLanguage
}
else {
defaultLanguage = LCLDefaultLanguage
}
return defaultLanguage
}
/**
Resets the current language to the default
*/
open class func resetCurrentLanguageToDefault() {
setCurrentLanguage(self.defaultLanguage())
}
/**
Get the current language's display name for a language.
- Parameter language: Desired language.
- Returns: The localized string.
*/
open class func displayNameForLanguage(_ language: String) -> String {
let locale : NSLocale = NSLocale(localeIdentifier: currentLanguage())
if let displayName = locale.displayName(forKey: NSLocale.Key.identifier, value: language) {
return displayName
}
return String()
}
}