Come fare il parsing JSON a Swift utilizzando NSURLSession

Question

Sto cercando di analizzare JSON, ma sempre questo errore:

type of expression is ambiguous without more context

Il mio codice è:

func jsonParser() { 

    let urlPath = "http://headers.jsontest.com/" 
    let endpoint = NSURL(string: urlPath) 
    let request = NSMutableURLRequest(URL:endpoint!) 

    let session = NSURLSession.sharedSession() 
    NSURLSession.sharedSession().dataTaskWithRequest(request){ (data, response, error) throws -> Void in 

     if error != nil { 
      print("Get Error") 
     }else{ 
      //var error:NSError? 
      do { 
       let json:AnyObject = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions(rawValue: 0)) as? NSDictionary 

      print(json) 

     } catch let error as NSError { 
      // error handling 
      print(error?.localizedDescription) 
     } 
     } 
    } 
    //task.resume() 
} 

Questo sta lavorando bene con fuori tentativo di cattura in Xcode 6.4 ma questo non funziona in Xcode 7.

Answer 1

Non dichiarare un tipo AnyObject per l'oggetto decodificato poiché si desidera che sia un NSDictionary e si sta eseguendo una conversione per farlo.

Inoltre, è preferibile utilizzare zero opzioni per NSJSONSerialization anziché random.

Nel mio esempio ho anche utilizzato un tipo di errore personalizzato solo per dimostrazione.

Nota: se si utilizza un tipo di errore personalizzato, è necessario includere anche un catch generico per essere esaustivo (in questo esempio, con un downcast semplice a NSError).

enum JSONError: String, ErrorType { 
    case NoData = "ERROR: no data" 
    case ConversionFailed = "ERROR: conversion from JSON failed" 
} 

func jsonParser() { 
    let urlPath = "http://headers.jsontest.com/" 
    guard let endpoint = NSURL(string: urlPath) else { 
     print("Error creating endpoint") 
     return 
    } 
    let request = NSMutableURLRequest(URL:endpoint) 
    NSURLSession.sharedSession().dataTaskWithRequest(request) { (data, response, error) in 
     do { 
      guard let data = data else { 
       throw JSONError.NoData 
      } 
      guard let json = try NSJSONSerialization.JSONObjectWithData(data, options: []) as? NSDictionary else { 
       throw JSONError.ConversionFailed 
      } 
      print(json) 
     } catch let error as JSONError { 
      print(error.rawValue) 
     } catch let error as NSError { 
      print(error.debugDescription) 
     } 
    }.resume() 
} 

Lo stesso con Swift 3.0.2:

enum JSONError: String, Error { 
    case NoData = "ERROR: no data" 
    case ConversionFailed = "ERROR: conversion from JSON failed" 
} 

func jsonParser() { 
    let urlPath = "http://headers.jsontest.com/" 
    guard let endpoint = URL(string: urlPath) else { 
     print("Error creating endpoint") 
     return 
    } 
    URLSession.shared.dataTask(with: endpoint) { (data, response, error) in 
     do { 
      guard let data = data else { 
       throw JSONError.NoData 
      } 
      guard let json = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary else { 
       throw JSONError.ConversionFailed 
      } 
      print(json) 
     } catch let error as JSONError { 
      print(error.rawValue) 
     } catch let error as NSError { 
      print(error.debugDescription) 
     } 
    }.resume() 
} 

Answer 2

Apple dichiara qui.

func dataTaskWithRequest(request: NSURLRequest, completionHandler: (NSData?, NSURLResponse?, NSError?) -> Void) -> NSURLSessionDataTask 

Fix it:

NSURLSession.sharedSession().dataTaskWithRequest(request) { (data, response, error) -> Void in 
     // Your handle response here! 
} 

UPDATE:

func jsonParser() { 
    let urlPath = "http://headers.jsontest.com/" 
    let endpoint = NSURL(string: urlPath) 
    let request = NSMutableURLRequest(URL:endpoint!) 

    NSURLSession.sharedSession().dataTaskWithRequest(request) { (data, response, error) -> Void in 
     print(error) 
    }.resume() 
} 

RISULTATO:

Optional(Error Domain=NSURLErrorDomain Code=-1022 "The resource could not be loaded because the App Transport Security policy requires the use of a secure connection." UserInfo={NSUnderlyingError=0x7f8873f148d0 {Error Domain=kCFErrorDomainCFNetwork Code=-1022 "(null)"}, NSErrorFailingURLStringKey= http://headers.jsontest.com/ , NSErrorFailingURLKey= http://headers.jsontest.com/ , NSLocalizedDescription=The resource could not be loaded because the App >Transport Security policy requires the use of a secure connection.})

Spero che questo aiuti!

Answer 3

1) Effettuare classe ApiConnection al tuo progetto .. importazione Fondazione classe ApiConnection: NSObject {

class func postDataWithRequest(_ dicData:NSDictionary, completionHandler:@escaping (_ response:NSDictionary?,_ status:Bool)->Void) 
{ 
    let URL=Foundation.URL(string: Constant.API_URL) 
    let request=NSMutableURLRequest(url: URL!) 
    request.httpMethod="POST" 
    request.addValue(Constant.kApplicationJSON, forHTTPHeaderField:Constant.kContentType) 
    let data=try? JSONSerialization .data(withJSONObject: dicData, options: JSONSerialization.WritingOptions.prettyPrinted) 
    request.httpBody=data 

    //let dispatchTime = dispatch_time(DISPATCH_TIME_NOW, Int64(Double(NSEC_PER_SEC)*5)) 
    //dispatch_after(dispatchTime, dispatch_get_main_queue()) { 
    let session = URLSession.shared.dataTask(with: request as URLRequest,completionHandler: { (data, response, error) in 
     if error==nil 
     { 
      DispatchQueue.main.async(execute: { 
       let dicResponse = try? JSONSerialization .jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments) as! NSDictionary 
       completionHandler(dicResponse, error==nil) 
      }) 
     } 
     else 
     { 
      completionHandler(nil, error==nil) 
     } 
    }) 
    session.resume() 
    } 
} 
**********************************use this in your view controller**************** 

let dict : NSMutableDictionary = [:]; 

    dict["Your key"] = "your value" 
    dict["Your key"] = "your value" 
    dict["Your key"] = "your value" 

    ApiConnection.postDataWithRequest(dict) { (response, status) in 
     if(status){ 
      print(response); 
     else{ 
      print("failed webservice call"); 
     } 
    } 

************************************* Swift3.0 *************************************

 var objDic = [String: Any]() 
     let dic = NSMutableDictionary() 
     print(dic) 
     objDic["action"] = "" 
     objDic["product_id"] = self.peroductid 
     //   arrProduct .addObjects(from: objDic) as! Dictionary 
     print("\(objDic)") 


     Alamofire.request(Constant.Webservice_productinfo, 
          method: HTTPMethod.post, 
          parameters:objDic as? Parameters, 
          encoding: JSONEncoding.default, 
          headers: nil).responseJSON 


      { 
       (response:DataResponse<Any>) in 
       switch(response.result) 
       { 
       case .success(_): 
        if response.result.value != nil 
        { 
          let status = response2?.object(forKey: "status") as! String? 

         if status == "error"{} 

         //finding the status from response 
         var response2 = response.result.value as AnyObject? 
          self.response1 = response.result.value as! NSDictionary 
               let type = 
         (self.cartlistarray[0] as!NSDictionary)["base_image"] 
             cell.productname.text = (self.cartlistarray[0] as!NSDictionary)["name"] as? String 

    //Store the result value in swift 3.0 

    UserDefaults.standard.set(userDetail.value(forKey: "email") as? NSString, forKey: "email") 
     if(UserDefaults.standard.object(forKey:"email") == nil){} 
//did select row click the data pass into another view 
    let ProductListViewController = self.storyboard?.instantiateViewController(withIdentifier: "ProductListViewController") as! ProductListViewController   
ProductListViewController.category_id = ((self.bannerarry[0] as? [String : String])?["cat_id"])! 

//or else callin from indexpath.row 

      item = ((cartlistarray[indexpath.row] as? NSDictionary)?.value(forKey:"product_id") as! String?)! 

estensione UIAlertController {

func showErrorAlert(strMesage:NSString,VC:Any) 
{ 
    let alert = UIAlertController(title: "Demo App", message: strMesage as String, preferredStyle: UIAlertControllerStyle.alert) 
    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil)) 
    (VC as AnyObject).present(alert, animated: true, completion: nil) 
} 

} estensione UILabel {

func setLabel(strTitle:String) 
{ 
    self.backgroundColor = UIColor.clear 
    self.textColor = UIColor.white 
    self.textAlignment = NSTextAlignment.left 
    self.font = UIFont(name: "Avenir-Light", size: 15.0) 
    self.font = UIFont.italicSystemFont(ofSize: 15) 
    self.text=strTitle 
} 

}

//image in to base 64 

let image = imageCamera.image 
      let imageData:NSData = UIImageJPEGRepresentation(image!, 1.0)!as NSData 
      imageconvert = imageData.base64EncodedString(options: .lineLength64Characters) 
      base64formate = imageconvert.trimmingCharacters(in:CharacterSet.whitespaces) 
      print(base64formate) 

print data into profle view 

    let imageurl:String! = SharedManager.sharedInstance().myMutableDict.value(forKey:"profileimg") as? String ?? "123" 
    let url = URL(string: imageurl) 

    DispatchQueue.global(qos: .userInitiated).async { 

     let imageData:NSData = NSData(contentsOf: url!)! 
     // When from background thread, UI needs to be updated on main_queue 
     DispatchQueue.main.async { 
      let image = UIImage(data: imageData as Data) 
      self.imageview.image = image 

     } 
    } 


       let actionSheetController: UIAlertController = UIAlertController(title: "Magento Extension App", message:response1?.object(forKey: "message") as? String, preferredStyle: .alert) 
          actionSheetController.addAction(UIAlertAction(title: "Ok", style: .default , handler:{ (UIAlertAction)in 
           print("Ok button click") 
          })) 
          self.present(actionSheetController, animated: true, completion: nil) 
     } 

       case .failure(_): 

        print("error: \(response.result.error)") // original 
        URL request 
        break 
       } 
     } 

*************** *********** objc ************************************** ************

NSDictionary *objDic1 = @{@"mode":@"loginUser", 
             @"email":[result 
objectForKey:@"email"], 
             @"password":@"", 
             }; 
      // With AFNetworking 
      AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc]initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]]; 
      manager.requestSerializer = [AFJSONRequestSerializer serializer]; 
      [manager.requestSerializer setTimeoutInterval:100]; 

      // manager set 
      [manager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; 

      [manager POST:WEBSERVICE_CALL_URL parameters:objDic1 progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable result) { 

       [SVProgressHUD dismiss]; 

       NSLog(@"This s my response %@",result); 
       NSLog(@"success!"); 

       if ([[result valueForKey:kStatus] isEqualToString:kOK]) 
       { 
       } 
        } 
        failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) 
       { 
}]; 
****************SDK LINK******************************************* 
https://github.com/AFNetworking/AFNetworking 

var userDetail = NSArray() 
           userDetail = self.response1.value(forKey: "userData") as! NSArray 
           print(userDetail) 

self.tmpDic = userDetail[0] as! NSDictionary 
             print(self.tmpDic) 

             var optionsdic = NSDictionary() 
             optionsdic = self.tmpDic.value(forKey:"options") as! NSDictionary 
             print(optionsdic) 

             self.arrayOfKeys = optionsdic.allKeys as NSArray 
             print(self.arrayOfKeys) 
             if (self.arrayOfKeys.contains("color")) 
             { 
              print("color") 

              self.colorarray = optionsdic.value(forKey:"color") as! NSArray 
              print(self.colorarray.count) 

              for index in 0..<self.colorarray.count 
              { 
               var dic = NSDictionary() 
               dic = self.colorarray .object(at: index) as! NSDictionary 
               self.colorarrayobject .add(dic) 
               print(dic) 
              } 
              print(self.colorarrayobject) 

             } 
             else { 

              var defaultarray = NSArray() 
              defaultarray = optionsdic.value(forKey:"default") as! NSArray 
              print(defaultarray) 

              self.element0array = defaultarray[0] as! NSArray 
              print(self.element0array) 


              self.dic = self.element0array[0] as! NSDictionary 
              print(dic) 

              self.arr5 = self.dic .value(forKey: "values") as! NSArray 
              print(self.arr5) 

              for iteams in 0..<self.arr5.count 
              { 

               var type = String() 
               type = ((self.arr5[iteams]as! NSDictionary)["label"]! as? String)! 
               self.configeresizeaarray.append(type) 
              } 

              print("default") 

             } 

            } 
            self.imagearray = self.array[0] as! NSArray 

            for items in 0..<self.imagearray.count 
            { 
             var type = String() 
             type = ((self.imagearray [items]as! NSDictionary)["image"]! as? String)! 
             self.cell0imagearray.append(type) 
            } 
            self.count = self.imagearray.count as Int 
            self.configurePageControl() 
            self.tableView.reloadData() 
           } 
           else 
           { 

           } 

          } 
          else 
          { 

          } 

Answer 4

Ecco il modo più semplice per analizzare JSON utilizzando NSUrlSession.,

let PARAMS = "{\"params1\":\"%@\",\"Params2\":\"%@\",\"params3\":\"%@\"}" 
let URL = "your url here" 

sul pulsante di invio scrivere questo codice.,

let urlStr = String(format: "%@",URL) 
let jsonString = String(format:PARAMS, params1value,params2value,params3value) 
// Encode your data here 
let jsonData = jsonString.data(using:.utf8) 
var request = URLRequest(url: URL(string: urlStr)!) 
request.setValue("application/json", forHTTPHeaderField: "Content-Type") 
request.setValue("application/json", forHTTPHeaderField: "Accept") 
//set your method type here 
request.httpMethod = "POST" 
request.httpBody = jsonData 
let configuration = URLSessionConfiguration.default 
// create a session here 
let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: OperationQueue.main) 
    let task = session.dataTask(with: request) {(data , response, error) in 
     if(error != nil){ 
      print("Error \(String(describing: error))") 
     } 
else { 
      do { 
       let fetchedDataDictionary = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary 
       print(fetchedDataDictionary!) 
       let message = fetchedDataDictionary?["response key here"] as! String 
       if message == "your response string" { 
        print(message) 

       } 
       else { 
        self.dataArray = (fetchedDataDictionary?["data"] as! NSArray) 
       } 
      } 
      catch let error as NSError { 
       print(error.debugDescription) 
      } 
     } 
    } 
    task.resume()