Swift Convert enum value to String

Question

Given the following enum   enum Audience       case Public     case Friends     case Private     How do I get the string  Public  from the audience constant below   let audience   Audience Public

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Updated for the release of Xcode 7 GM   It works as one would hope now--thanks Apple   enum Rank Int       case Ace   1  Two  Three  Four  Five  Six  Seven  Eight  Nine  Ten  Jack  Queen  King    let r   Rank Ace  print r                   prints  Ace  print  Rank    r          prints  Rank  Ace

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For now  I ll redefine the enum as   enum Audience  String       case Public    Public      case Friends    Friends      case Private    Private      so that I can do   audience toRaw       Public    But  isn t this new enum definition redundant  Can I keep the initial enum definition and do something like   audience toString       Public

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The idiomatic interface for  getting a String  is to use the CustomStringConvertible  interface and access the description getter   Define your enum as  enum Foo   CustomStringConvertible     case Bing   case Bang   case Boom      var description   String        switch self          Use Internationalization  as appropriate      case  Bing  return  quot Bing quot      case  Bang  return  quot Bang quot      case  Boom  return  quot Boom quot               In action    gt  let foo   Foo Bing foo  Foo   Bing   gt  println   quot String for  foo  is   foo  quot  String for  foo  is Bing  Updated  For Swift  gt   2 0  replaced Printable with CustomStringConvertible Note  Using CustomStringConvertible allows Foo to adopt a different raw type   For example enum Foo   Int  CustomStringConvertible         is possible   This freedom can be useful

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There are multiple ways to do this  Either you could define a function in the enum which returns the string based on the value of enum type   enum Audience          func toString  - gt String    var a String    switch self     case  Public      a  Public     case  Friends      a  Friends             return a     Or you could can try this   enum Audience String     case Public  Public     case Friends  Friends     case Private  Private      And to use  it   var a Audience Audience Public println a toRaw

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Not sure in which Swift version this feature was added  but right now  Swift 2 1  you only need this code   enum Audience   String       case public     case friends     case private    let audience   Audience public rawValue     public       When strings are used for raw values  the implicit value for each case   is the text of that case   s name              enum CompassPoint   String       case north  south  east  west         In the example above  CompassPoint south has an implicit raw value of    south   and so on       You access the raw value of an enumeration case with its rawValue   property   let sunsetDirection   CompassPoint west rawValue    sunsetDirection is  west        Source

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Starting from Swift 3 0  you can var str   String describing  Audience friends

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For anyone reading the example in  A Swift Tour  chapter of  The Swift Programming Language  and looking for a way to simplify the simpleDescription   method  converting the enum itself to String by doing String self  will do it   enum Rank  Int       case Ace   1   required otherwise Ace will be 0     case Two  Three  Four  Five  Six  Seven  Eight  Nine  Ten     case Jack  Queen  King     func simpleDescription   - gt  String           switch self               case  Ace   Jack   Queen   King                  return String self  lowercaseString             default                  return String self rawValue

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Use Ruby way var public  String    quot   Audience Public  quot

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A swift 3 and above example if using Ints in Enum  public enum ECategory   Int          case Attraction 0  FP  Food  Restroom  Popcorn  Shop  Service  None          var description  String               return String describing  self                   let category   ECategory Attraction let categoryName   category description   string Attraction

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One more way public enum HTTP  case get case put case delete case patch var value  String    return String describing  self

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It couldn t get simpler than this in Swift 2 and the latest Xcode 7  no need to specify enum type  or  rawValue  descriptors etc      Updated for Swift 3 and Xcode 8       enum Audience           case Public         case Friends         case Private            let audience  Audience    Public     or  let audience   Audience Public     print audience      Public

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After try few different ways  i found that if you don t want to use   let audience   Audience Public toRaw     You can still archive it using a struct  struct Audience      static let Public     Public     static let Friends    Friends     static let Private    Private      then your code   let audience   Audience Public   will work as expected  It isn t pretty and there are some downsides because you not using a  enum   you can t use the shortcut only adding  Private neither will work with switch cases

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I like to use Printable with Raw Values   enum Audience  String  Printable       case Public    Public      case Friends    Friends      case Private    Private       var description  String           return self rawValue           Then we can do   let audience   Audience Public description    audience    Public    or  println  The value of Public is   Audience Public        Prints  The value of Public is Public

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In swift 3  you can use this  var enumValue   Customer Physics var str   String describing  enumValue    from Swift how to use enum to get string value

[string] Swift: Convert enum value to String?

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