What s NSLocalizedString equivalent in Swift

Question

Is there an Swift equivalent of NSLocalizedString       In Objective-C  we usually use   NSString  string   NSLocalizedString   key     comment      How can I achieve the same in Swift  I found a function   func NSLocalizedString      key  String      tableName  String    default      bundle  NSBundle   default      value  String   default       comment  String  - gt  String   However  it is very long and not convenient at all

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A variation of the existing answers   Swift 5 1   extension String        func localized withComment comment  String    nil  - gt  String           return NSLocalizedString self  comment  comment                   You can then simply use it with or without comment    Goodbye  localized    Hello  localized withComment   Simple greeting     Please note that genstrings won t work with this solution

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This is an improvement on the   localized  approach  Start with adding the class extension as this will help with any strings you were setting programatically   extension String       func localized  bundle  Bundle    main  tableName  String    Localizable   - gt  String           return NSLocalizedString self  tableName  tableName  value     self    comment                Example use for strings you set programmatically     override func viewWillAppear   animated  Bool        super viewWillAppear animated    Now Xcode s storyboard translation files make the file manager messy and don t handle updates to the storyboard well either  A better approach is to create a new basic label class and assign it to all your storyboard labels   class BasicLabel  UILabel         initWithFrame to init view from code     override init frame  CGRect          super init frame  frame        setupView                initWithCode to init view from xib or storyboard     required init  coder aDecoder  NSCoder          super init coder  aDecoder        setupView                common func to init our view     private func setupView             let storyboardText   self text         text   storyboardText  localized             Now every label you add and provide default default for in the storyboard will automatically get translated  assuming you ve provide a translation for it    You could do the same for UIButton   class BasicBtn  UIButton         initWithFrame to init view from code     override init frame  CGRect          super init frame  frame        setupView                initWithCode to init view from xib or storyboard     required init  coder aDecoder  NSCoder          super init coder  aDecoder        setupView                common func to init our view     private func setupView             let storyboardText   self titleLabel  text         let lclTxt   storyboardText  localized           setTitle lclTxt  for   normal

User · Answer

Probably the best way is this one here   fileprivate func NSLocalizedString   key  String  - gt  String       return NSLocalizedString key  comment          and  import Foundation extension String       static let Hello   NSLocalizedString  Hello       static let ThisApplicationIsCreated   NSLocalizedString  This application is created by the swifting io team       static let OpsNoFeature   NSLocalizedString  Ops  It looks like this feature haven t been implemented yet           you can then use it like this  let message  String    ThisApplicationIsCreated print message    to me this is the best because   The hardcoded strings are in one specific file  so the day you want to change it it s really easy Easier to use than manually typing the strings in your file every time genstrings will still work you can add more extensions  like one per view controller to keep things neat

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In addition to great extension written here  if you are lazy to find and replace old NSLocalizedString you can open find  amp  replace in Xcode and in the find section you can write NSLocalizedString     quot    quot     comment   quot  quot    then in the replace section you need to write  1 localized to change all NSLocalizedString with  quot blabla quot  localized in your project

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Though this doesnt answer to the shortening problem  but this helped me to organize the messages  I created a structure for error messages like below  struct Constants          Error Messages     struct ErrorMessages           static let unKnownError   NSLocalizedString  Unknown Error   comment   Unknown Error Occured           static let downloadError   NSLocalizedString  Error in Download   comment   Error in Download            let error   Constants ErrorMessages unKnownError   This way you can organize the messages and make genstrings work   And this is the genstrings command used  find    -name    swift -print0   xargs -0 genstrings -o  en lproj

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The NSLocalizedString exists also in the Swift s world   func NSLocalizedString      key  String      tableName  String    default      bundle  NSBundle   default      value  String   default       comment  String  - gt  String   The tableName  bundle  and value parameters are marked with a default keyword which means we can omit these parameters while calling the function  In this case  their default values will be used   This leads to a conclusion that the method call can be simplified to   NSLocalizedString  key   comment   comment     Swift 5 - no change  still works like that

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Created a small helper method for cases  where  comment  is always ignored  Less code is easier to read   public func NSLocalizedString key  String  - gt  String       return NSLocalizedString key  comment          Just put it anywhere  outside a class  and Xcode will find this global method

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Swift 3 version        import Foundation  extension String       var localized  String           return NSLocalizedString self  tableName  nil  bundle  Bundle main  value      comment

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Localization with default language   extension String   func localized   - gt  String          let defaultLanguage    en         let path   Bundle main path forResource  defaultLanguage  ofType   lproj          let bundle   Bundle path  path           return NSLocalizedString self  tableName  nil  bundle  bundle   value      comment

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By using this way its possible to create a different implementation for different types  i e  Int or custom classes like CurrencyUnit        Its also possible to scan for this method invoke using the genstrings utility  Simply add the routine flag to the command  genstrings MyCoolApp Views SomeView swift -s localize -o     extension       import UIKit  extension String       public static func localize key  String  comment  String  - gt  String           return NSLocalizedString key  comment  comment            usage   String localize  foo bar   comment   Foo Bar Comment

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I ve created my own genstrings sort of tool for extracting strings using a custom translation function  extension String        func localizedWith comment String  - gt  String           return NSLocalizedString self  tableName  nil  bundle  Bundle main  value      comment  comment             https   gist github com Maxdw e9e89af731ae6c6b8d85f5fa60ba848c  It will parse all your swift files and exports the strings and comments in your code to a  strings file   Probably not the easiest way to do it  but it is possible

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Actually  you can use two phases to translate your texts in Swift projects   1  The first phase is using the old way to create all your translatable strings   NSLocalisedString  Text to translate   comment   Comment to comment     1 1  Then you should use genstrings to generate Localizable strings     genstrings  swift   2  Afterwards  you should use this answer   2 1  Use your XCode  Find and Replace  option based on the regular expression  As for the given example  if you have no comments  the regular expression will be   NSLocalizedString         comment             and replace it with   1 localized   or  if you have comments   NSLocalizedString         comment            and replace it with   1 localizedWithComment comment   2    You are free to play with regex and different extension combinations as you wish  The general way is splitting the whole process in two phases  Hope that helps

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When you are developing an SDK  You need some extra operation   1  create Localizable strings as usual in YourLocalizeDemoSDK   2  create the same Localizable strings in YourLocalizeDemo   3  find your Bundle Path of YourLocalizeDemoSDK   Swift4      if you use NSLocalizeString in NSObject  you can use it like this let value   NSLocalizedString  key   tableName  nil  bundle  Bundle for  type of  self    value      comment        Bundle for  type of  self   helps you to find the bundle in YourLocalizeDemoSDK  If you use Bundle main instead  you will get a wrong value in fact it will be the same string with the key    But if you want to use the String extension mentioned by dr OX  You need to do some more  The origin extension looks like this   extension String       var localized  String           return NSLocalizedString self  tableName  nil  bundle  Bundle main  value      comment                As we know  we are developing an SDK  Bundle main will get the bundle of YourLocalizeDemo s bundle  That s not what we want  We need the bundle in YourLocalizeDemoSDK  This is a trick to find it quickly   Run the code below in a NSObject instance in YourLocalizeDemoSDK  And you will get the URL of YourLocalizeDemoSDK   let bundleURLOfSDK   Bundle for  type of  self   bundleURL let mainBundleURL   Bundle main bundleURL   Print both of the two url  you will find that we can build bundleURLofSDK base on mainBundleURL  In this case  it will be   let bundle   Bundle url  Bundle main bundleURL appendingPathComponent  Frameworks   appendingPathComponent  YourLocalizeDemoSDK framework       Bundle main   And the String extension will be   extension String       var localized  String           let bundle   Bundle url  Bundle main bundleURL appendingPathComponent  Frameworks   appendingPathComponent  YourLocalizeDemoSDK framework       Bundle main         return NSLocalizedString self  tableName  nil  bundle  bundle  value      comment                Hope it helps

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When you to translate  say from English  where a phrase is the same  to another language where it is different  because of the gender  verb conjugations or declension  the simplest NSString form in Swift that works in all cases is the three arguments one  For example  the English  phrase  previous was    is translated differently to Russian for the case of  weight                     and for  waist                         In this case you need two different translation for one Source  in terms of XLIFF tool recommended in WWDC 2018   You cannot achieve it with two argument NSLocalizedString  where  previous was  will be the same both for the  key  and the English translation  i e  for the value   The only way is to use the three argument form  NSLocalizedString  previousWasFeminine   value   previous was   comment   previousWasFeminine    NSLocalizedString  previousWasMasculine   value   previous was   comment   previousWasMasculine     where keys   previousWasFeminine  and  previousWasMasculine    are different   I know that the general advice is to translate the phrase as the whole  however  sometimes it too time consuming and inconvenient

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I use next solution   1  create extension   extension String       var localized  String           return NSLocalizedString self  tableName  nil  bundle  Bundle main  value      comment                2  in Localizable strings file    Hi                3  example of use   myLabel text    Hi  localized   enjoy      --upd --  for case with comments you can use this solution   1  Extension   extension String       func localized withComment String  - gt  String           return NSLocalizedString self  tableName  nil  bundle  Bundle main  value      comment  withComment            2  in  strings file      with         Hi                   3  using   myLabel text    Hi  localized withComment   with

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Helpfull for usage in unit tests   This is a simple version which can be extended to different use cases  e g  with the use of tableNames    public func NSLocalizedString key  String  referenceClass  AnyClass  comment  String       - gt  String        let bundle   NSBundle forClass  referenceClass      return NSLocalizedString key  tableName nil  bundle  bundle  comment  comment      Use it like this   NSLocalizedString  YOUR-KEY   referenceClass  self    Or like this with a comment   NSLocalizedString  YOUR-KEY   referenceClass  self  comment   usage description

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