swift 3 0 Data to String

Question

func application   application  UIApplication  didRegisterForRemoteNotificationsWithDeviceToken deviceToken  Data       I want deviceToken to string  but   let str   String init data  deviceToken  encoding   utf8    str is nil  swift 3 0   how can I let data to string    Registering for Push Notifications in Xcode 8 Swift 3 0  not working and the answer is a few months ago  I had tried it     and print

User · Accepted Answer

I came looking for the answer to the Swift 3 Data to String question and never got a good answer  After some fooling around I came up with this   var testString    This is a test string  var somedata   testString data using  String Encoding utf8  var backToString   String data  somedata   encoding  String Encoding utf8  as String

User · Answer

If your data is base64 encoded   if   dataObj    nil         let encryptedDataText   dataObj  base64EncodedString options  NSData Base64EncodingOptions        NSLog  Encrypted with pubkey       encryptedDataText

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let urlString   baseURL   currency      if let url   URL string  urlString           let session   URLSession configuration   default                  let task   session dataTask with  url    data  reponse  error  in             if error    nil                  print error                  return                             let dataString   String data  data   encoding   utf8              print dataString                      task resume

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here is my data extension  add this and you can call data ToString    import Foundation  extension Data       func toString   - gt  String                return String data  self  encoding   utf8

User · Answer

let str   deviceToken map   String format    02hhx    0    joined

User · Answer

According to the Apple doc below  device token can not be decoded  So  I think the best thing to do is just leave it be   https   developer apple com library content documentation NetworkingInternet Conceptual RemoteNotificationsPG APNSOverview html Security Architecture A device token is an opaque NSData instance that contains a unique identifier assigned by Apple to a specific app on a specific device  Only APNs can decode and read the contents of a device token  Each app instance receives its unique device token when it registers with APNs  and must then forward the token to its provider  as described in Configuring Remote Notification Support  The provider must include the device token in each push notification request that targets the associated device  APNs uses the device token to ensure the notification is delivered only to the unique app-device combination for which it is intended

User · Answer

You can also use let data   String decoding  myStr  as  UTF8 self  here is a resource about converting data to string

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for swift 5  let testString    This is a test string  let somedata   testString data using  String Encoding utf8  let backToString   String data  somedata   encoding  String Encoding utf8  as String  print  testString  gt    testString      testString  gt  This is a test string print  somedata  gt    String describing  somedata       somedata  gt  Optional 21 bytes  print  backToString  gt    String describing  backToString       backToString  gt  Optional  This is a test string

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This is much easier in Swift 3 and later using reduce   func application   application  UIApplication  didRegisterForRemoteNotificationsWithDeviceToken deviceToken  Data        let token   deviceToken reduce        0   String format    02x    1         DispatchQueue global qos   background  async            let url   URL string   https   example com myApp apns php             var request   URLRequest url  url          request addValue  application json   forHTTPHeaderField   Content-Type           request httpMethod    POST          request httpBody   try  JSONSerialization data withJSONObject                 token    token                ios    UIDevice current systemVersion               languages    Locale preferredLanguages joined separator                                URLSession shared dataTask with  request  resume

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To extend on the answer of weijia wang   extension Data       func hexString   - gt  String           let nsdataStr   NSData init data  self          return nsdataStr description trimmingCharacters in  CharacterSet charactersIn    lt  gt     replacingOccurrences of       with                use it with deviceToken hexString

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I found the way to do it  You need to convert Data to NSData   let characterSet   CharacterSet charactersIn    lt  gt    let nsdataStr   NSData init data  deviceToken  let deviceStr   nsdataStr description trimmingCharacters in  characterSet  replacingOccurrences of       with      print deviceStr

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Swift 4 version of 4redwings s answer   let testString    This is a test string  let somedata   testString data using  String Encoding utf8  let backToString   String data  somedata   encoding  String Encoding utf8

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