How to initialise a string from NSData in Swift

Question

I have been trying to initialise a string from NSData in Swift   In the NSString Cocoa Documentation Apple is saying you have to use this    init data data  NSData   encoding encoding  UInt    However Apple did not include any example for usage or where to put the init   I am trying to convert the following code from Objective-C to Swift  NSString  string  string     NSString alloc  initWithData  data encoding  NSUTF8StringEncoding     I have been trying a lot of possible syntaxes such as the following  of course it did not work    var string NSString  string   init data  fooData encoding  NSUTF8StringEncoding

User · Answer

This is the implemented code needed   in Swift 3 0   var dataString   String data  fooData  encoding  String Encoding utf8    or just  var dataString   String data  fooData  encoding   utf8    Older swift version   in Swift 2 0   import Foundation  var dataString   String data  fooData  encoding  NSUTF8StringEncoding    in Swift 1 0   var dataString   NSString data  fooData  encoding NSUTF8StringEncoding

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Objective - C  NSData  myStringData      My String  dataUsingEncoding NSUTF8StringEncoding    NSString  myStringFromData     NSString alloc  initWithData myStringData encoding NSUTF8StringEncoding   NSLog   My string value      myStringFromData     Swift    This your data containing the string    let myStringData    My String  dataUsingEncoding NSUTF8StringEncoding        Use this method to convert the data into String    let myStringFromData    String data myStringData   encoding  NSUTF8StringEncoding      print  My string value     myStringFromData     http   objectivec2swift blogspot in 2016 03 coverting-nsdata-to-nsstring-or-convert html

User · Answer

Swift 2 0  It seems that Swift 2 0 has actually introduced the String data encoding   as an String extension when you import Foundation  I haven t found any place where this is documented  weirdly enough    pre Swift 2 0  Lightweight extension  Here s a copy-pasteable little extension without using NSString  let s cut the middle-man   import Foundation  extension NSData       var byteBuffer   UnsafeBufferPointer lt UInt8 gt    get   return UnsafeBufferPointer lt UInt8 gt  start  UnsafeMutablePointer lt UInt8 gt  self bytes   count  self length        extension String       init  data   NSData  encoding   NSStringEncoding                self init bytes  data byteBuffer  encoding  encoding              Playground test let original    Nymphs blitz quick vex dwarf jog  let encoding   NSASCIIStringEncoding  if let data   original dataUsingEncoding encoding        String data  data  encoding  encoding      This also give you access to data byteBuffer which is a sequence type  so all those cool operations you can do with sequences also work  like doing a reduce    0  amp    1   for a checksum   Notes  In my previous edit  I used this method   var buffer   Array lt UInt8 gt  count  data length  repeatedValue  0x00  data getBytes  amp buffer  length  data length  self init bytes  buffer  encoding  encoding    The problem with this approach  is that I m creating a copy of the information into a new array  thus  I m duplicating the amount of bytes  specifically  encoding size   data length

User · Answer

This is how you should initialize the NSString   Swift 2 X or older  let datastring   NSString data  fooData  encoding  NSUTF8StringEncoding    Swift 3 or newer   let datastring   NSString data  fooData  encoding  String Encoding utf8 rawValue    This doc explains the syntax

User · Answer

Another answer based on extensions  boy do I miss this in Java    extension NSData       func toUtf8   - gt  String            return String data  self  encoding  NSUTF8StringEncoding            Then you can use it   let data   NSData   getDataFromEpicServer   let string   String    data toUtf8      Note that the string is optional  the initial NSData may be unconvertible to Utf8

User · Answer

import Foundation var string   NSString data  NSData   encoding  UInt

User · Answer

Since the third version of Swift you can do the following   let desiredString   NSString data  yourData  encoding  String Encoding utf8 rawValue    simialr to what Sunkas advised

[string] How to initialise a string from NSData in Swift

in Swift 3.0:

Examples related to string

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Examples related to nsdata