Make REST API call in Swift

Question

I m trying to use Swift to make a GET call to a REST API  and have tried to follow numerous tutorials  but can t figure it out   Either because I cannot figure out how to translate all the Obj-C to Swift  or because half of the methods n  such are deprecated   Does anyone know how to make the call  and parse returned JSON data

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Swift 3 0  let request   NSMutableURLRequest url  NSURL string   http   httpstat us 200    as URL  let session   URLSession shared request httpMethod    GET  request addValue  application json   forHTTPHeaderField   Content-Type   request addValue  application json   forHTTPHeaderField   Accept    let task   session dataTask with  request as URLRequest  completionHandler   data  response  error - gt  Void in       if error    nil             print  Error    String describing  error             else             print  Response    String describing  response                   task resume

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In swift 3 3 and 4  I crated APIManager class with two public methods  Just pass required parameter  api name and request type  You will get response then pass it to the closure    import UIKit         struct RequestType         static let  POST    POST        static let  GET    GET             enum HtttpType  String         case POST    POST        case GET     GET             class APIManager  NSObject           static let sharedInstance  APIManager              let instance   APIManager           return instance                private init                 First Method            public func requestApiWithDictParam dictParam  Dictionary lt String Any gt   apiName  String requestType  String  isAddCookie  Bool  completionHendler  escaping    response Dictionary lt String AnyObject gt      error  NSError     success  Bool - gt  Void                 var apiUrl             Your api url             apiUrl    apiUrl appendingFormat       apiName              let config   URLSessionConfiguration default             let session   URLSession configuration  config              let url   URL string  apiUrl               let HTTPHeaderField ContentType     Content-Type              let ContentType ApplicationJson     application json              var request   URLRequest init url  url               request timeoutInterval   60 0             request cachePolicy   URLRequest CachePolicy reloadIgnoringLocalCacheData             request addValue ContentType ApplicationJson  forHTTPHeaderField  HTTPHeaderField ContentType              request httpMethod   requestType              print apiUrl              print dictParam               let dataTask   session dataTask with  request     data  response  error  in                if error    nil                     completionHendler nil  error as NSError   false                  do                   let resultJson   try JSONSerialization jsonObject with  data   options      as   String AnyObject                  print  Request API      apiUrl                  print  API Response     resultJson                        completionHendler resultJson  nil  true                   catch                   completionHendler nil  error as NSError   false                                            dataTask resume                              Second Method            public func requestApiWithUrlString param  String  apiName  String requestType  String  isAddCookie  Bool  completionHendler  escaping    response Dictionary lt String AnyObject gt      error  NSError     success  Bool - gt  Void                     var apiUrl         Your api url                 let config   URLSessionConfiguration default                 let session   URLSession configuration  config                              var request  URLRequest                   if requestType     GET                       apiUrl    String format        amp      YourAppBaseUrl apiName param                    apiUrl   apiUrl addingPercentEncoding withAllowedCharacters   urlQueryAllowed                     print  URL   apiUrl                     let url   URL string  apiUrl                     request   URLRequest init url  url                    request  httpMethod    GET                     else                      apiUrl    String format          YourAppBaseUrl apiName                    apiUrl   apiUrl addingPercentEncoding withAllowedCharacters   urlQueryAllowed                     print  URL   apiUrl                     let bodyParameterData   param data using   utf8                    let url   URL string  apiUrl                      request   URLRequest url  url                    request  httpBody   bodyParameterData                   request  httpMethod    POST                                     request  timeoutInterval   60 0                 request  cachePolicy   URLRequest CachePolicy reloadIgnoringLocalCacheData                 request  httpShouldHandleCookies   true                  let dataTask   session dataTask with  request      data  response  error  in                    if error    nil                       completionHendler nil  error as NSError   false                      do                       if data    nil                          let resultJson   try JSONSerialization jsonObject with  data   options      as   String AnyObject                         print  Request API      apiUrl                        print  API Response     resultJson                              completionHendler resultJson  nil  true                         else                          completionHendler nil  error as NSError   false                                            catch                       completionHendler nil  error as NSError   false                                                        dataTask resume                                 Here is example of calling Post API from any class       let bodyParameters   String format   appid    amp appversion      1   1               APIManager sharedInstance requestApiWithUrlString param  bodyParameters  apiName   PASS API NAME   requestType  HtttpType POST rawValue  isAddCookie  false     dictResponse  error  success  in                  if success                       if let dictMessage   dictResponse   message   as  Dictionary lt String  AnyObject gt                       do you work                                           else                       print  Something went wrong                                                      Or just use simple function   func dataRequest         let urlToRequest         Your API url      let url   URL string  urlToRequest       let session4   URLSession shared     let request   NSMutableURLRequest url  url      request httpMethod    POST      request cachePolicy   NSURLRequest CachePolicy reloadIgnoringCacheData     let paramString    data Hello      request httpBody   paramString data using  String Encoding utf8      let task   session4 dataTask with  request as URLRequest     data  response  error  in       guard let    Data   data  let    URLResponse   response  error    nil else           print       error           return               if let dataString   NSString data  data   encoding  String Encoding utf8 rawValue              print      Data    dataString      JSONSerialization                   task resume

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func getAPICalling mainUrl String          create URL     guard let url   URL string  mainUrl  else         print  quot Error  cannot create URL quot         return             create request     let urlRequest   URLRequest url  url              create the session     let config   URLSessionConfiguration default     let session   URLSession configuration  config              make the request     let task   session dataTask with  urlRequest           data  response  error  in                   check for any errors       guard error    nil else           print  quot error calling GET quot           print error  localizedDescription          return                           make sure we got data       guard let responseData   data else           print  quot error  did not receive data quot           return                           convert Data in JSON  amp  amp  parse the result as JSON  since that s what the API provides       do           guard let object   try JSONSerialization jsonObject with  responseData  options                as   String  Any  else               print  quot error trying to convert data to JSON quot               return                     JSON Response         guard let todoTitle   object  quot response quot   as  NSDictionary else             print  quot Could not get todo title from JSON quot             return                              Get array in response         let responseList   todoTitle value forKey   quot radioList quot   as  NSArray                  for item in responseList               let dic   item as  NSDictionary             let str   dic value forKey   quot radio des quot   as  String             self arrName append str              print item                             DispatchQueue main async               self tblView reloadData                              catch            print  quot error trying to convert data to JSON quot           return                   task resume      Usage  getAPICalling mainUrl  quot https   dousic com api radiolist user id 16 quot

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Here is the complete code for REST API requests using NSURLSession in swift  For GET Request   let configuration   NSURLSessionConfiguration  defaultSessionConfiguration       let session   NSURLSession configuration  configuration        let urlString   NSString format   your URL here        print  get wallet balance url string is   urlString          let url   NSURL string  urlString as String      let request   NSMutableURLRequest   NSMutableURLRequest       request URL   NSURL string  NSString format        urlString  as String      request HTTPMethod    GET      request timeoutInterval   30      request addValue  application json   forHTTPHeaderField   Content-Type       request addValue  application json   forHTTPHeaderField   Accept        let dataTask   session dataTaskWithRequest request             let data  NSData   let response  NSURLResponse   let error  NSError   - gt  Void in             1  Check HTTP Response for successful GET request         guard let httpResponse   response as  NSHTTPURLResponse  receivedData   data             else                   print  error  not a valid http response                   return                    switch  httpResponse statusCode                    case 200               let response   NSString  data  receivedData  encoding  NSUTF8StringEncoding              print  response is   response                  do                   let getResponse   try NSJSONSerialization JSONObjectWithData receivedData  options   AllowFragments                   EZLoadingActivity  hide                                      catch                   print  error serializing JSON    error                               break         case 400               break         default              print  wallet GET request got response   httpResponse statusCode                        dataTask resume     For POST request      let configuration   NSURLSessionConfiguration  defaultSessionConfiguration       let session   NSURLSession configuration  configuration       let params     username  bindings  objectForKey  username     provider   walkingcoin    securityQuestion  securityQuestionField text    securityAnswer  securityAnswerField text   as Dictionary lt String  AnyObject gt       let urlString   NSString format     your URL          print  url string is   urlString        let request   NSMutableURLRequest   NSMutableURLRequest       request URL   NSURL string  NSString format        urlString as String      request HTTPMethod    POST      request timeoutInterval   30     request addValue  application json   forHTTPHeaderField   Content-Type       request addValue  application json   forHTTPHeaderField   Accept             request HTTPBody    try  NSJSONSerialization dataWithJSONObject params  options           let dataTask   session dataTaskWithRequest request                         let data  NSData   let response  NSURLResponse   let error  NSError   - gt  Void in                1  Check HTTP Response for successful GET request             guard let httpResponse   response as  NSHTTPURLResponse  receivedData   data                 else                       print  error  not a valid http response                       return                            switch  httpResponse statusCode                            case 200                   let response   NSString  data  receivedData  encoding  NSUTF8StringEncoding                    if response     SUCCESS                                                    default                  print  save profile POST request got response   httpResponse statusCode                            dataTask resume     I hope it works

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edited for swift 2  let url   NSURL string   http   www test com        let task   NSURLSession sharedSession   dataTaskWithURL url     data  response  error  in         print NSString data  data   encoding  NSUTF8StringEncoding              task resume

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I think the NSURLSession api fits better in this situation  Because if you write swift code your project target is at least iOS 7 and iOS 7 supports NSURLSession api  Anyway here is the code  let url    YOUR URL   NSURLSession sharedSession   dataTaskWithURL NSURL string  url     data  response  error in        Handle result   resume

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Swift 5 API call method   Send Request with ResultType lt Success  Error gt      func fetch requestURL URL requestType String parameter  String AnyObject   completion  escaping  Result lt Any gt   - gt                  Check internet connection as per your convenience           Check URL whitespace validation as per your convenience           Show Hud         var urlRequest   URLRequest init url  requestURL          urlRequest cachePolicy    reloadIgnoringLocalCacheData         urlRequest timeoutInterval   60         urlRequest httpMethod   String describing  requestType          urlRequest setValue  quot application json  charset utf-8 quot   forHTTPHeaderField   quot Content-Type quot           urlRequest setValue  quot application json  charset utf-8 quot   forHTTPHeaderField   quot Accept quot                      Post URL parameters set as URL body         if let params   parameter              do                  let parameterData   try JSONSerialization data withJSONObject params  options  prettyPrinted                  urlRequest httpBody   parameterData              catch                   Hide hude and return error                 completion  failure error                                     URL Task to get data         URLSession shared dataTask with  requestURL     data  response  error  in               Hide Hud               fail completion for Error             if let objError   error                  completion  failure objError                               Validate for blank data and URL response status code             if let objData   data let objURLResponse   response as  HTTPURLResponse                    We have data validate for JSON and convert in JSON                 do                      let objResposeJSON   try JSONSerialization jsonObject with  objData  options   mutableContainers                        Check for valid status code 200 else fail with error                     if objURLResponse statusCode    200                          completion  success objResposeJSON                                          catch                      completion  failure error                                             resume          Use of API call method func useOfAPIRequest            if let baseGETURL   URL string  quot https   postman-echo com get foo1 bar1 amp foo2 bar2 quot                self fetch requestURL  baseGETURL  requestType   quot GET quot   parameter  nil     result  in                       switch result                        case  success let response                            print  quot Hello World   response  quot                         case  failure let error                            print  quot Hello World   error  quot

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Swift 4  Create an app using  Alamofire with Api Post method  Install pod file -pod  Alamofire       4 0  for Swift 3 with Xcode 9  Create Webservices swift class  import Alamofire  Design storyBoard  Login View   insert following Code for the ViewControllerClass  import UIKit  class ViewController  UIViewController         IBOutlet var usernameTextField  UITextField        IBOutlet var passwordTextField  UITextField      var usertypeStr  String    -----------      var loginDictionary   NSDictionary      override func viewDidLoad             super viewDidLoad              Do any additional setup after loading the view  typically from a nib             override func didReceiveMemoryWarning             super didReceiveMemoryWarning              Dispose of any resources that can be recreated              IBAction func loginButtonClicked   sender  Any            WebServices userLogin userName  usernameTextField text   password  passwordTextField text  userType  usertypeStr    result  message  status  in             if status                   let loginDetails   result as  WebServices                 self loginDictionary   loginDetails  loginData                 if self loginDictionary   status   as  String     error                                        self alertMessage alerttitle   Login Error    self loginDictionary   message   as  String                      else if self loginDictionary   status   as  String     ok                        self alertMessage alerttitle       Success                     else                       self alertMessage alerttitle       self loginDictionary   message   as  String                                    else                   self alertMessage alerttitle       Sorry                                      func alertMessage alerttitle String   message   String           let alertViewController   UIAlertController title alerttitle   message message  preferredStyle   alert          alertViewController addAction UIAlertAction title   OK   style   default  handler  nil           present alertViewController  animated  true  completion  nil             Insert Following Code For WebserviceClass  import Foundation import Alamofire class WebServices  NSObject       enum WebServiceNames  String           case baseUrl    https   ---------------          case UserLogin    ------------                MARK  - Login Variables     var loginData   NSDictionary       class func userLogin userName  String password   String userType   String  completion    escaping    response   AnyObject     message  String     success   Bool - gt                let url   WebServiceNames baseUrl rawValue   WebServiceNames UserLogin rawValue         let params     USER   userName  PASS  password  API Key    userType          WebServices postWebService urlString  url  params  params as  String   AnyObject      response  message  status  in             print response     Error               let result   WebServices               if let data   response as  NSDictionary                   print data                  result loginData   data                 completion result   Success   true                else                   completion    as AnyObject    Failed   false                                      MARK  - Post     class func postWebService urlString  String  params   String   AnyObject   completion    escaping    response   AnyObject     message  String     success   Bool - gt  Void            alamofireFunction urlString  urlString  method   post  paramters  params     response  message  success  in             if response    nil                   completion response as AnyObject       true               else                  completion nil      false                                     class func alamofireFunction urlString   String  method   Alamofire HTTPMethod  paramters    String   AnyObject   completion    escaping    response   AnyObject     message  String     success   Bool - gt  Void            if method    Alamofire HTTPMethod post               Alamofire request urlString  method   post  parameters  paramters  encoding  URLEncoding default  headers  nil  responseJSON    response DataResponse lt Any gt   in                  print urlString                   if response result isSuccess                      completion response result value as AnyObject       true                   else                      completion nil      false                                            else               Alamofire request urlString  responseJSON    response  in                  if response result isSuccess                      completion response result value as AnyObject       true                   else                      completion nil      false                                                           Mark -Cancel     class func cancelAllRequests                 Alamofire SessionManager default session getTasksWithCompletionHandler   dataTasks  uploadTasks  downloadTasks in             dataTasks forEach    0 cancel                 uploadTasks forEach    0 cancel                 downloadTasks forEach    0 cancel

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let headers                      cache-control    no-cache                    postman-token    6f8a-12c6-87a1-ac0f25d6385a                             let request   NSMutableURLRequest url  NSURL string   Your url string    as URL                                                cachePolicy   useProtocolCachePolicy                                                timeoutInterval  10 0              request httpMethod    GET              request allHTTPHeaderFields   headers              let session   URLSession shared             let dataTask   session dataTask with  request as URLRequest  completionHandler     data  response  error  - gt  Void in                 if error    nil  amp  amp  data    nil                       do                              Convert NSData to Dictionary where keys are of type String  and values are of any type                         let json   try JSONSerialization jsonObject with  data   options  JSONSerialization ReadingOptions mutableContainers  as   String AnyObject                          print json                             do your stuff                            completionHandler true                         catch                             completionHandler false                                                          else if error    nil                                         completionHandler false                                   resume

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If you re working in Swift 3  the syntax changes  The example here worked for me and has a good explanation of the steps  https   grokswift com simple-rest-with-swift   This is the code from that tutorial   let todoEndpoint  String    https   jsonplaceholder typicode com todos 1  guard let url   URL string  todoEndpoint  else     print  Error  cannot create URL     return   let urlRequest   URLRequest url  url   let task   session dataTask with  urlRequest       data  response  error  in      check for any errors   guard error    nil else       print  error calling GET on  todos 1       print error       return          make sure we got data   guard let responseData   data else       print  Error  did not receive data       return          parse the result as JSON  since that s what the API provides   do       guard let todo   try JSONSerialization jsonObject with  responseData  options            as   String  Any  else         print  error trying to convert data to JSON         return              now we have the todo        let s just print it to prove we can access it     print  The todo is      todo description          the todo object is a dictionary        so we just access the title using the  title  key        so check for a title and print it if we have one     guard let todoTitle   todo  title   as  String else         print  Could not get todo title from JSON         return           print  The title is      todoTitle      catch        print  error trying to convert data to JSON       return       task resume

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swift 4  USE ALAMOFIRE in our App plz install pod file  pod  Alamofire       4 0   We can Use API for Json Data -https   swapi co api people   Then We can create A networking class for Our project- networkingService swift  import Foundation import Alamofire typealias JSON    String Any  class networkingService       static let shared   networkingService       private init          func getPeople success successblock   escaping  GetPeopleResponse  - gt  Void            Alamofire request  https   swapi co api people    responseJSON   response in         guard let json   response result value as  JSON else  return            print json          do                   let getPeopleResponse   try GetPeopleResponse json  json                  successblock getPeopleResponse               catch                   func getHomeWorld homeWorldLink String completion   escaping String  - gt Void           Alamofire request homeWorldLink  responseJSON   response  in             guard let json   response result value as  JSON              let name   json  name   as  String                 else return              completion name                  Then Create NetworkingError swift class  import Foundation enum networkingError   Error      case badNetworkigStuff      Then create Person swift class  import Foundation struct Person       private let homeWorldLink   String     let birthyear   String     let gender   String     let haircolor   String     let eyecolor   String     let height   String     let mass   String     let name   String     let skincolor   String     init  json   JSON            guard let birthyear   json  birth year   as  String          let eyecolor   json  eye color   as  String          let gender   json  gender   as  String          let haircolor   json  hair color   as  String          let height   json  height   as  String          let homeWorldLink   json  homeworld   as  String          let mass   json  mass   as  String          let name   json  name   as  String          let skincolor   json  skin color   as  String         else   return nil           self homeWorldLink   homeWorldLink         self birthyear   birthyear         self gender   gender         self haircolor   haircolor         self eyecolor   eyecolor         self height   height         self mass   mass         self name   name         self skincolor   skincolor           func homeWorld   completion   escaping  String  - gt  Void             networkingService shared getHomeWorld homeWorldLink  homeWorldLink    homeWorld  in             completion homeWorld                      Then create DetailVC swift   import UIKit class DetailVC  UIViewController       var person  Person       IBOutlet var name  UILabel       IBOutlet var birthyear  UILabel       IBOutlet var homeworld  UILabel       IBOutlet var eyeColor  UILabel       IBOutlet var skinColor  UILabel       IBOutlet var gender  UILabel       IBOutlet var hairColor  UILabel       IBOutlet var mass  UILabel       IBOutlet var height  UILabel      override func viewDidLoad             super viewDidLoad          print person          name text   person name         birthyear text   person birthyear         eyeColor text   person eyecolor         gender text   person gender         hairColor text   person haircolor         mass text   person mass         height text   person height         skinColor text   person skincolor         person homeWorld  homeWorld  in             self homeworld text   homeWorld                     Then Create GetPeopleResponse swift class  import Foundation struct GetPeopleResponse       let people    Person      init json  JSON  throws           guard let results   json  results   as   JSON  else   throw networkingError badNetworkigStuff          let people   results map Person json   0   flatMap   0           self people   people               Then Our View controller class   import UIKit  class ViewController  UIViewController         IBOutlet var tableVieww  UITableView      var people    Person           IBAction func getAction   sender  Any            print  GET           networkingService shared getPeople  response in             self people   response people            self tableVieww reloadData                       override func prepare for segue  UIStoryboardSegue  sender  Any                 guard segue identifier     peopleToDetails           let detailVC   segue destination as  DetailVC          let person   sender as AnyObject as  Person         else  return          detailVC person   person                 extension ViewController UITableViewDataSource          func numberOfSections in tableView  UITableView  - gt  Int               return 1                   func tableView   tableView  UITableView  numberOfRowsInSection section  Int  - gt  Int               return people count                   func tableView   tableView  UITableView  cellForRowAt indexPath  IndexPath  - gt  UITableViewCell            let cell   UITableViewCell               cell textLabel  text   people indexPath row  name              return cell                  extension ViewController UITableViewDelegate      func tableView   tableView  UITableView  didSelectRowAt indexPath  IndexPath            performSegue withIdentifier   peopleToDetails   sender  people indexPath row             In our StoryBoard  plz Connect with our View with another one using segue with identifier -peopleToDetails   Use UITableView In our First View  Use UIButton For get the Data  Use 9 Labels in our DetailVc

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Swift 4 - GET request  var request   URLRequest url  URL string   http   example com api v1 example     request httpMethod    GET   URLSession shared dataTask with  request  completionHandler    data  response  error - gt  Void in     do           let jsonDecoder   JSONDecoder           let responseModel   try jsonDecoder decode CustomDtoClass self  from  data           print responseModel        catch           print  JSON Serialization error            resume     Don t forget to configure App Transport Security Settings to add your domain to the exceptions and allow insecure http requests if you re hitting endpoints without using HTTPS   You can use a tool like http   www json4swift com  to autogenerate your Codeable Mappings from your JSON responses

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Api Call using Model Class      let urlString    http   -- 154 -- 78 ------ index php route api coupon all       let url   URL string  urlString      var request   URLRequest url  url       request httpMethod    GET       URLSession shared dataTask with request     data  response  error  in         if error    nil               print error            else               do                    let parsedDictionaryArray   try JSONSerialization jsonObject with  data   as   String AnyObject                  print parsedDictionaryArray                   if let arry   parsedDictionaryArray  data   as    String AnyObject                     for dic in arry                       let name   dic  name                       let descriptionData   dic  description                       self modelReference append model name  name as  String  descriptionStr  descriptionData as  String                       print name                                                     catch let error as NSError                   print error                                     resume     create a variable and connect with model class  var modelReference    model      create a model class New -  swift class  import Foundation class model   NSObject  var name   String var descriptionStr  String  init name   String  descriptionStr  String        self name   name     self descriptionStr   descriptionStr        then we can connect with our table view objects   let cell   tableView dequeueReusableCell withIdentifier   TableViewCellID  as  TableViewCell     cell listName text   modelReference indexPath row  name

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Swift 5  amp  4  let params     username   john    password   123456   as Dictionary lt String  String gt   var request   URLRequest url  URL string   http   localhost 8080 api 1 login     request httpMethod    POST  request httpBody   try  JSONSerialization data withJSONObject  params  options      request addValue  application json   forHTTPHeaderField   Content-Type    let session   URLSession shared let task   session dataTask with  request  completionHandler    data  response  error - gt  Void in     print response       do           let json   try JSONSerialization jsonObject with  data   as  Dictionary lt String  AnyObject gt          print json        catch           print  error             task resume

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You can do like this     var url   String    http   google com test toto amp test2 titi  var request   NSMutableURLRequest   NSMutableURLRequest   request URL   NSURL string  url  request HTTPMethod    GET   NSURLConnection sendAsynchronousRequest request  queue  NSOperationQueue    completionHandler    response NSURLResponse   data  NSData   error  NSError   - gt  Void in     var error  AutoreleasingUnsafeMutablePointer lt NSError  gt    nil     let jsonResult  NSDictionary    NSJSONSerialization JSONObjectWithData data  options NSJSONReadingOptions MutableContainers  error  error  as  NSDictionary      if  jsonResult    nil               process jsonResult       else             couldn t load JSON  look at error                 EDIT   For people have problem with this maybe your JSON stream is an   array    and not an object    so you have to change jsonResult to   NSArray instead of NSDictionary

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