Swift 3 URLSession shared Ambiguous reference to member dataTask with completionHandler error bug

Question

Hello I have working json parsing code for swift2 2 but when i use it for Swift 3 0 gives me that error     ViewController swift 132 31  Ambiguous reference to member  dataTask with completionHandler      My codes here     let listUrlString     http   bla com batchSize     String batchSize      amp fromIndex     String fromIndex      let myUrl   URL string  listUrlString       let request   NSMutableURLRequest url myUrl        request httpMethod    GET        let task   URLSession shared   dataTask with  request            data  response  error in          if error    nil               print error  localizedDescription              DispatchQueue main sync execute                    AWLoader hide                               return                    do                let json   try JSONSerialization jsonObject with  data   options   mutableContainers  as  NSArray              if let parseJSON   json                    var items   self categoryList                  items append contentsOf  parseJSON as   String                    if self fromIndex  lt  items count                        self categoryList   items                     self fromIndex   items count                      DispatchQueue main async execute                             self categoriesTableView reloadData                            AWLoader hide                                            else if  self fromIndex    items count                         DispatchQueue main async execute                             AWLoader hide                                                                          catch               AWLoader hide               print error                        task resume     Thanks for ideas

User · Answer

Tested xcode 8 stable version   Need to use var request variable with URLRequest   With thats you can easily fix that  bug   var request   URLRequest url myUrl   And   let task   URLSession shared   dataTask with  request as URLRequest        Worked fine   Thank you guys  i think help many people

User · Answer

This problem is caused by URLSession has two dataTask methods  open func dataTask with request  URLRequest  completionHandler   escaping  Data   URLResponse   Error   - gt  Swift Void  - gt  URLSessionDataTask open func dataTask with url  URL  completionHandler   escaping  Data   URLResponse   Error   - gt  Swift Void  - gt  URLSessionDataTask   The first one has URLRequest as parameter  and the second one has URL as parameter  so we need to specify which type to call  for example  I want to call the second method  let task   URLSession shared dataTask with  url  as URL        data  response  error in        Handler

User · Answer

In swift 3 the compiler is confused by the function signature  Specifying it will clear the error  Also convert the url string to type URL  The following code worked for me      let urlString    http   bla com batchSize      let pathURL   URL string  urlString      var urlRequest   URLRequest url pathURL       let session   URLSession shared     let dataTask   session dataTask with  urlRequest as URLRequest     data response error  in

User · Answer

For me I do this to find   let url   URL string  urlString  URLSession shared dataTask with  url      data  response  error  in        Can t use   let url   NSURL string  urlString

User · Answer

prepare json data         let mapDict      1   First    2   Second            let json      title   ABC     dict   mapDict   as  String   Any          let jsonData   NSData   NSKeyedArchiver archivedData withRootObject  json  as NSData             create post request         let url   NSURL string   http   httpbin org post            let request   NSMutableURLRequest url  url as URL          request httpMethod    POST              insert json data to the request         request httpBody   jsonData as Data           let task   URLSession shared dataTask with  request as URLRequest   data response error in             if error    nil                  return                           do                   let result   try JSONSerialization jsonObject with  data   options      as   String AnyObject                   print  Result  result                  catch                   print  Error - gt    error                                     task resume

User · Answer

let task   URLSession shared dataTask with  request as URLRequest  completionHandler    data response error in         if error    nil              print error  localizedDescription              return                   if let responseJSON    try  JSONSerialization jsonObject with  data   options       as   String AnyObject               if let response token String   responseJSON  token   as  String                   print  Singleton Firebase Token     response token                    completion response token                                     task resume

User · Answer

You have init d myRequest as NSMutableURLRequest  you need this    var URLRequest   Swift is ditching both the NSMutable    thing  Just use var for the new classes

User · Answer

The compiler is confused by the function signature  You can fix it like this   let task   URLSession shared dataTask with  request as URLRequest      But  note that we don t have to cast  request  as URLRequest in this signature if it was declared earlier as URLRequest instead of NSMutableURLRequest   var request   URLRequest url myUrl     This is the automatic casting between NSMutableURLRequest and the new URLRequest that is failing and which forced us to do this casting here

User · Answer

For Swift 3 and Xcode 8         var dataTask  URLSessionDataTask         if  let url   URL string  urlString                self dataTask   URLSession shared dataTask with  url  completionHandler     data  response  error  in                  if let error   error                       print error localizedDescription                    else if let httpResponse   response as  HTTPURLResponse  httpResponse statusCode    200                           You can use data received                      self process data  data as Data                                                         Note  You can always use debugger to check error

User · Answer

Xcode 10 1 Swift 4  This worked for me   let task  URLSessionDataTask   session dataTask with  request as URLRequest     data  response  error  - gt  Void in       The key was adding in the URLSessionDataTask type declaration

User · Answer

Short and concise answer for Swift 3   guard let requestUrl   URL string  yourURL  else   return    let request   URLRequest url requestUrl  URLSession shared dataTask with  request         data  response  error  in            resume

User · Answer

To load data via a GET request you don t need any URLRequest  and no semicolons   let listUrlString     http   bla com batchSize     String batchSize      amp fromIndex     String fromIndex  let myUrl   URL string  listUrlString   let task   URLSession shared dataTask with  myUrl

User · Answer

Xcode 8 and Swift 3 0  Using URLSession    let url   URL string  Download URL     let req   NSMutableURLRequest url url   let config   URLSessionConfiguration default  let session   URLSession configuration  config  delegate  self  delegateQueue  OperationQueue main    let task   URLSessionDownloadTask   session downloadTask with  req as URLRequest  task resume     URLSession Delegate call   func urlSession   session  URLSession  task  URLSessionTask  didCompleteWithError error  Error          func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask   didWriteData bytesWritten  Int64  totalBytesWritten writ  Int64  totalBytesExpectedToWrite exp  Int64                       print  downloaded   100 writ exp   as AnyObject      func urlSession   session  URLSession  downloadTask  URLSessionDownloadTask  didFinishDownloadingTo location  URL        Using Block GET POST PUT DELETE    let request   NSMutableURLRequest url  URL string   Your API URL here   param  param             cachePolicy   useProtocolCachePolicy          timeoutInterval  Your request timeout time in Seconds       request httpMethod    GET      request allHTTPHeaderFields   headers as   String   String        let session   URLSession shared      let dataTask   session dataTask with  request as URLRequest   data response error in         let httpResponse   response as  HTTPURLResponse          if  error    nil             print error             else            print httpResponse                      DispatchQueue main async                Update your UI here                      dataTask resume     Working fine for me   try it 100  result guarantee

User · Answer

In my case error was in NSURL  let url   NSURL string  urlString    In Swift 3 you must write just URL   let url   URL string  urlString

[ios] Swift 3 URLSession.shared() Ambiguous reference to member 'dataTask(with:completionHandler:) error (bug)

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