How can I encode a string to Base64 in Swift

Question

I want to convert a string to Base64  I found answers in several places  but it does not work anymore in Swift  I am using Xcode 6 2  I believe the answer might be work in previous Xcode versions and not Xcode 6 2   Could someone please guide me to do this in Xcode 6 2   The answer I found was this  but it does not work in my version of Xcode   var str    iOS Developer Tips encoded in Base64  println  Original    str        UTF 8 str from original    NSData  type returned  optional  let utf8str   str dataUsingEncoding NSUTF8StringEncoding      Base64 encode UTF 8 string    fromRaw 0  is equivalent to objc  base64EncodedStringWithOptions 0     Notice the unwrapping given the NSData  optional    NSString  returned  optional  let base64Encoded   utf8str base64EncodedStringWithOptions NSDataBase64EncodingOptions fromRaw 0    println  Encoded     base64Encoded        Base64 Decode  go back the other way     Notice the unwrapping given the NSString  optional    NSData returned let data   NSData base64EncodedString  base64Encoded  options    NSDataBase64DecodingOptions fromRaw 0        Convert back to a string let base64Decoded   NSString data  data  encoding  NSUTF8StringEncoding  println  Decoded     base64Decoded      ref  http   iosdevelopertips com swift-code base64-encode-decode-swift html

User · Answer

Swift 4 2  var base64String    my fancy string  data using   utf8  allowLossyConversion  false   base64EncodedString     to decode  see  from https   gist github com stinger a8a0381a57b4ac530dd029458273f31a         Swift 3  Base64 encoding and decoding import Foundation  extension String           Base64 encoding a string     func base64Encoded   - gt  String            if let data   self data using   utf8                return data base64EncodedString                     return nil                Base64 decoding a string     func base64Decoded   - gt  String            if let data   Data base64Encoded  self                return String data  data  encoding   utf8                    return nil         var str    Hello  playground  print  Original string      str       if let base64Str   str base64Encoded         print  Base64 encoded string      base64Str          if let trs   base64Str base64Decoded             print  Base64 decoded string      trs              print  Check if base64 decoded string equals the original string    str    trs

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Swift 5 1  Xcode 11   public extension String            Assuming the current string is base64 encoded  this property returns a String         initialized by converting the current string into Unicode characters  encoded to         utf8  If the current string is not base64 encoded  nil is returned instead      var base64Decoded  String            guard let base64   Data base64Encoded  self  else   return nil           let utf8   String data  base64  encoding   utf8          return utf8                Returns a base64 representation of the current string  or nil if the         operation fails      var base64Encoded  String            let utf8   self data using   utf8          let base64   utf8  base64EncodedString           return base64

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Swift  import Foundation  extension String        func fromBase64   - gt  String            guard let data   Data base64Encoded  self  else               return nil                    return String data  data  encoding   utf8             func toBase64   - gt  String           return Data self utf8  base64EncodedString

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Swift 4 2   abcd1234  data using   utf8   base64EncodedString

User · Answer

I don   t have 6 2 installed but I don   t think 6 3 is any different in this regard   dataUsingEncoding returns an optional  so you need to unwrap that   NSDataBase64EncodingOptions fromRaw has been replaced with NSDataBase64EncodingOptions rawValue     Slightly surprisingly  this is not a failable initializer so you don   t need to unwrap it   But since NSData base64EncodedString   is a failable initializer  you need to unwrap that   Btw  all these changes were suggested by Xcode migrator  click the error message in the gutter and it has a    fix-it    suggestion    Final code  rewritten to avoid force-unwraps  looks like this   import Foundation  let str    iOS Developer Tips encoded in Base64  println  Original    str     let utf8str   str dataUsingEncoding NSUTF8StringEncoding   if let base64Encoded   utf8str  base64EncodedStringWithOptions NSDataBase64EncodingOptions rawValue  0           println  Encoded     base64Encoded         if let base64Decoded   NSData base64EncodedString  base64Encoded  options    NSDataBase64DecodingOptions rawValue  0                              map   NSString data   0  encoding  NSUTF8StringEncoding                      Convert back to a string         println  Decoded     base64Decoded               if using Swift 1 2 you could use multiple if-lets instead of the map   Swift 5 Update   import Foundation  let str    iOS Developer Tips encoded in Base64  print  Original    str     let utf8str   str data using   utf8   if let base64Encoded   utf8str  base64EncodedString options  Data Base64EncodingOptions rawValue  0         print  Encoded    base64Encoded         if let base64Decoded   Data base64Encoded  base64Encoded  options  Data Base64DecodingOptions rawValue  0        map   String data   0  encoding   utf8                  Convert back to a string         print  Decoded    base64Decoded

User · Answer

Airspeed Velocity answer in Swift 2 0   let str    iOS Developer Tips encoded in Base64  print  Original    str    let base64Encoded   str dataUsingEncoding NSUTF8StringEncoding   base64EncodedStringWithOptions     print  Encoded    base64Encoded    let base64DecodedData   NSData base64EncodedString  base64Encoded  options       var base64DecodedString   String data  base64DecodedData  encoding  NSUTF8StringEncoding   print  Decoded    base64DecodedString

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SwiftyBase64  full disclosure  I wrote it  is a native Swift Base64 encoding  no decoding library  With it  you can encode standard Base64   let bytesToEncode    UInt8     1 2 3  let base64EncodedString   SwiftyBase64 EncodeString bytesToEncode    or URL and Filename Safe Base64   let bytesToEncode    UInt8     1 2 3  let base64EncodedString   SwiftyBase64 EncodeString bytesToEncode  alphabet  URLAndFilenameSafe

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After thorough research I found the solution   Encoding      let plainData    plainString as NSString  dataUsingEncoding NSUTF8StringEncoding      let base64String  plainData base64EncodedStringWithOptions NSDataBase64EncodingOptions fromRaw 0        println base64String     bXkgcGxhbmkgdGV4dA     Decoding      let decodedData   NSData base64EncodedString  base64String  options NSDataBase64DecodingOptions fromRaw 0        let decodedString   NSString data  decodedData  encoding  NSUTF8StringEncoding          println decodedString     my plain data   More on this http   creativecoefficient net swift encoding-and-decoding-base64

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Swift 3 or 4  let base64Encoded   Data  original string  utf8  base64EncodedString

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Xcode 11 4     Swift 5 2 or later extension StringProtocol       var data  Data   Data utf8        var base64Encoded  Data   data base64EncodedData         var base64Decoded  Data    Data base64Encoded  string        extension LosslessStringConvertible       var string  String    init self        extension Sequence where Element    UInt8       var data  Data    init self        var base64Decoded  Data    Data base64Encoded  data        var string  String    String bytes  self  encoding   utf8        let original    quot iOS Developer Tips encoded in Base64 quot   let utf8Data   original data                                36 bytes let base64EncodedString   utf8Data base64EncodedString       aU9TIERldmVsb3BlciBUaXBzIGVuY29kZWQgaW4gQmFzZTY0 n quot  let base64EncodedData   utf8Data base64EncodedData           48 bytes quot   print  quot base64EncodedData  quot   original base64Encoded           48 bytes print  quot base64EncodedString  quot   original base64Encoded string     quot  quot       quot aU9TIERldmVsb3BlciBUaXBzIGVuY29kZWQgaW4gQmFzZTY0 quot  print  quot base64DecodedData  quot   original base64Encoded string  base64Decoded      quot  quot      36 bytes print  quot base64DecodedString  quot   original base64Encoded base64Decoded  string     quot  quot      iOS Developer Tips encoded in Base64

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Swift 4 0 3  import UIKit  extension String    func fromBase64   - gt  String        guard let data   Data base64Encoded  self  options  Data Base64DecodingOptions rawValue  0   else           return nil            return String data  data as Data  encoding  String Encoding utf8     func toBase64   - gt  String        guard let data   self data using  String Encoding utf8  else           return nil            return data base64EncodedString options  Data Base64EncodingOptions rawValue  0

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You could just do a simple extension like   import UIKit     MARK  - Mixed string utils and helpers extension String                 Encode a String to Base64       returns              func toBase64  - gt String           let data   self dataUsingEncoding NSUTF8StringEncoding           return data  base64EncodedStringWithOptions NSDataBase64EncodingOptions rawValue  0               iOS 7 and up

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After all struggle I did like this   func conversion str NSString         if let decodedData   NSData base64EncodedString  str as String  options NSDataBase64DecodingOptions rawValue  0            let decodedString   NSString data  decodedData  encoding  NSUTF8StringEncoding             print decodedString   Here we are getting decoded string   After I am calling another function for converting decoded string to dictionary          self  convertStringToDictionary decodedString as String             function close     for string to dictionary  func convertStringToDictionary text  String  - gt   String AnyObject         if let data   text dataUsingEncoding NSUTF8StringEncoding            do               let json   try NSJSONSerialization JSONObjectWithData data  options      as   String AnyObject               print json              if let stack   json   cid      getting key value here                               customerID   stack as  String                 print customerID                           catch let error as NSError               print error                      return nil

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FOR SWIFT 3 0   let str    iOS Developer Tips encoded in Base64  print  Original    str     let utf8str   str data using  String Encoding utf8   if let base64Encoded   utf8str  base64EncodedString options  NSData Base64EncodingOptions rawValue  0        print  Encoded     base64Encoded       if let base64Decoded   NSData base64Encoded  base64Encoded  options    NSData Base64DecodingOptions rawValue  0        map   NSString data   0 as Data  encoding  String Encoding utf8 rawValue                Convert back to a string     print  Decoded     base64Decoded

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Swift 3   4   5 1  Here is a simple String extension  allowing for preserving optionals in the event of an error when decoding   extension String           Encode a String to Base64     func toBase64   - gt  String           return Data self utf8  base64EncodedString                  Decode a String from Base64  Returns nil if unsuccessful      func fromBase64   - gt  String            guard let data   Data base64Encoded  self  else   return nil           return String data  data  encoding   utf8            Example   let testString    A test string    let encoded   testString toBase64       QSB0ZXN0IHN0cmluZy4    guard let decoded   encoded fromBase64       A test string       else   return

[swift] How can I encode a string to Base64 in Swift?

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