parse - string to json swift 4

Descargar y analizar json en swift

Question

Estoy tratando de obtener el JSON de un sitio web y analizarlo antes de ponerlo dentro de una vista de iOS.

Aquí está mi código;

func startConnection(){
        let urlPath: String = "http://binaenaleyh.net/dusor/"
        var url: NSURL = NSURL(string: urlPath)
        var request: NSURLRequest = NSURLRequest(URL: url)
        var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)
        connection.start()
    }

    func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
        self.data.appendData(data)
    }

    func buttonAction(sender: UIButton!){
        startConnection()
    }

    func connectionDidFinishLoading(connection: NSURLConnection!) {
        var err: NSError
        // throwing an error on the line below (can''t figure out where the error message is)
        var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
    }

Y este es el enlace para el JSON;

http://binaenaleyh.net/dusor/

¿Qué estoy haciendo mal aquí?

Answer 1

Aquí está el código rápido 3.1

URLSession.shared.dataTask(with: NSURL(string: "http://pastebin.com/raw/wgkJgazE")! as URL, completionHandler: { (data, response, error) -> Void in
        // Check if data was received successfully
        if error == nil && 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]
                // Access specific key with value of type String
                let str = json["key"] as! String
            } catch {
                // Something went wrong
            }
        }
    }).resume()

Answer 2

El siguiente ejemplo envía una solicitud para obtener información de stock: es un poco más completo, pero tiene más limpieza y estructura:

import Foundation

private let kSNStockInfoFetchRequestPath:String = "http://dev.markitondemand.com/Api/v2/Quote/json"

private func SNStockInfoFetchRequestURL(symbol:String) -> NSURL? {
  if let components:NSURLComponents = NSURLComponents(string:kSNStockInfoFetchRequestPath) {
    components.queryItems = [NSURLQueryItem(name:"symbol", value:symbol)]
    return components.URL
  }
  return nil
}

private func SNStockInfoFetchRequestURLRequest(symbol:String) ->  NSURLRequest? {
  if let requestURL:NSURL = SNStockInfoFetchRequestURL(symbol) {
    var request:NSMutableURLRequest = NSMutableURLRequest(URL:requestURL)
    request.HTTPMethod = "GET"
    return request
  }
  return nil
}

private func SNStockInfoFetchRequestParseData(receivedData:NSData, error:NSErrorPointer) -> NSDictionary? {
  return NSJSONSerialization.JSONObjectWithData(receivedData, options:NSJSONReadingOptions.MutableContainers, error:error) as? NSDictionary
}

class SNStockInfoFetchRequest: NSObject,
NSURLConnectionDataDelegate
{
  private let symbol:String
  private (set) var fetching:Bool
  private lazy var receivedData = NSMutableData()

  init(symbol:String) {
    self.symbol = symbol
    self.fetching = false
  }

  func start() {
    assert(!fetching, "Should not start a request that has already started!")
    fetching = true
    if let request:NSURLRequest = SNStockInfoFetchRequestURLRequest(symbol) {
      var connection:NSURLConnection = NSURLConnection(request:request, delegate:self, startImmediately:true)!
      connection.start()
    }
  }

  // MARK: NSURLConnectionDataDelegate

  func connection(connection:NSURLConnection, didReceiveData data:NSData) {
    assert(fetching, "Should only receive data while activly fetching!")
    self.receivedData.appendData(data)
  }

  func connectionDidFinishLoading(connection:NSURLConnection) {
    var error:NSError?
    if let result:NSDictionary = SNStockInfoFetchRequestParseData(receivedData, &error) {
      println(result)
    } else {
      println(error)
    }

  }
}

Ahora podemos usar la solicitud como tal:

let fetcher:SNStockInfoFetchRequest = SNStockInfoFetchRequest(symbol:"MSFT")
fetcher.start()

Esto debería generar el JSON en caso de éxito o el error en caso de falla. ¡Espero que esto ayude! Si usa la misma estructura, asegúrese de usar un delegado para devolver el JSON analizado (o incluso mejor, un objeto de valor inmutable) o indicar un error.

Answer 3

Estas dos funciones funcionaron para mí:

    func getJSON(urlToRequest: String) -> NSData{
        return NSData(contentsOfURL: NSURL(string: urlToRequest))
    }

    func parseJSON(inputData: NSData) -> NSDictionary{
        var error: NSError?
        var boardsDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(inputData, options: NSJSONReadingOptions.MutableContainers, error: &error) as NSDictionary

        return boardsDictionary
    }

Answer 4

Este código funciona bien para mí. Simplemente inicie la propiedad de data = NSMutableData() con data = NSMutableData() y escriba NSURLConnectionDelegate aquí class ViewController: UIViewController, NSURLConnectionDelegate

import UIKit

class ViewController: UIViewController, NSURLConnectionDelegate {

    @lazy var data = NSMutableData()

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        startConnection()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func startConnection(){
        let urlPath: String = "http://binaenaleyh.net/dusor/"
        var url: NSURL = NSURL(string: urlPath)
        var request: NSURLRequest = NSURLRequest(URL: url)
        var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)
        connection.start()
    }

    func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
        self.data.appendData(data)
    }

    func buttonAction(sender: UIButton!){
        startConnection()
    }

    func connectionDidFinishLoading(connection: NSURLConnection!) {
        var err: NSError
        // throwing an error on the line below (can''t figure out where the error message is)
        var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
        println(jsonResult)
    }
}

aquí está la salida:

{
    "ders sayisi" = 15;
    dersler =     (
                {
            0 = "2013-2014";
            1 = BAHAR;
            10 = TeacherHold;
            11 = 2;
            12 = "";
            2 = 2;
            3 = "CEE 102";
            4 = "Logic Circuits";
            5 = 3;
            6 = "6.00";
            7 = "YRD.DO/U00c7.DR.INDRIT MYDERRIZI";
            8 = 0;
            9 = IA;
        },
                {
            0 = "2013-2014";
            1 = BAHAR;
            10 = TeacherHold;
            11 = 1;
            12 = "";
            2 = 2;
            3 = "CIP 102";
            4 = "Civic Involment Projects";
            5 = 0;
            6 = "2.00";
            7 = "SE/U00c7/U0130L AVCI/BA/U015eAK CANSU AK/U00c7EL/U0130K//U00c7A/U011eLA UNGUN";
            8 = 0;
            9 = P;
        },
                {
            0 = "2013-2014";
            1 = BAHAR;
            10 = TeacherHold;
            11 = 2;
            12 = "";
            2 = 2;
            3 = "COME 108";
            4 = "Algorithms and Programming II";
            5 = 3;
            6 = "6.00";
            7 = "/U00d6/U011eR.G/U00d6R.DR.B/U0130RSEN G/U00dcLDEN /U00d6ZDEM/U0130R";
            8 = 41;
            9 = C;
        },
                {
            0 = "2013-2014";
            1 = BAHAR;
            10 = TeacherHold;
            11 = 1;
            12 = "";
            2 = 2;
            3 = "COME 335";
            4 = "Mobile Application Development";
            5 = 3;
            6 = "5.00";
            7 = "/U00d6/U011eR.G/U00d6R.OZAN UYSAL";
            8 = TeacherHold;
            9 = TeacherHold;
        },
                {
            0 = "2013-2014";
            1 = BAHAR;
            10 = TeacherHold;
            11 = 1;
            12 = "";
            2 = 2;
            3 = "ENG 112";
            4 = "Advanced English For Engineering and Natural Sciences I";
            5 = 2;
            6 = "3.00";
            7 = "OKT.ERIC BEECHER";
            8 = 48;
            9 = F;
        },
                {
            0 = "2013-2014";
            1 = BAHAR;
            10 = TeacherHold;
            11 = 1;
            12 = "";
            2 = 2;
            3 = "PHYS 102";
            4 = "Physics II";
            5 = 4;
            6 = "5.00";
            7 = "YRD.DO/U00c7.DR./U00d6ZG/U00dcL KURTULU/U015e /U00d6ZT/U00dcRK";
            8 = "-1";
            9 = F;
        },
                {
            0 = "2013-2014";
            1 = BAHAR;
            10 = TeacherHold;
            11 = 2;
            12 = "";
            2 = 2;
            3 = "T/U00dcRK 102";
            4 = "T/U00fcrk Dili II";
            5 = 2;
            6 = "2.00";
            7 = "/U00d6/U011eR.G/U00d6R./U015eER/U0130FE GEZG/U0130N";
            8 = 10;
            9 = F;
        },
                {
            0 = "2013-2014";
            1 = "G/U00dcZ";
            10 = TeacherHold;
            11 = 2;
            12 = "";
            2 = 1;
            3 = "CHEM 101";
            4 = Chemistry;
            5 = 3;
            6 = "5.00";
            7 = "YRD.DO/U00c7.DR.AY/U015eEN TULPAR";
            8 = TeacherHold;
            9 = F;
        },
                {
            0 = "2013-2014";
            1 = "G/U00dcZ";
            10 = TeacherHold;
            11 = 1;
            12 = "";
            2 = 1;
            3 = "CIP 101";
            4 = "Civic Involment Projects";
            5 = 0;
            6 = "1.00";
            7 = "YRD.DO/U00c7.DR.FATMA G/U00dcL AYGEN/Staff CIP1/SE/U00c7/U0130L AVCI/D/U0130LAYDA EM/U0130R/BA/U015eAK CANSU AK/U00c7EL/U0130K//U00c7A/U011eLA UNGUN";
            8 = TeacherHold;
            9 = P;
        },
                {
            0 = "2013-2014";
            1 = "G/U00dcZ";
            10 = TeacherHold;
            11 = 3;
            12 = "";
            2 = 1;
            3 = "COME 107";
            4 = "Algorithms and Programming I";
            5 = 4;
            6 = "5.00";
            7 = "PROF.DR.M/U0130TAT UYSAL";
            8 = TeacherHold;
            9 = "C+";
        },
                {
            0 = "2013-2014";
            1 = "G/U00dcZ";
            10 = TeacherHold;
            11 = 2;
            12 = "";
            2 = 1;
            3 = "ENG 101";
            4 = "Advanced English";
            5 = 2;
            6 = "3.00";
            7 = "OKT.EZG/U0130 ARGUN";
            8 = TeacherHold;
            9 = B;
        },
                {
            0 = "2013-2014";
            1 = "G/U00dcZ";
            10 = TeacherHold;
            11 = 1;
            12 = "";
            2 = 1;
            3 = "IUL 100";
            4 = "Introduction to University Life";
            5 = 0;
            6 = "1.00";
            7 = "YRD.DO/U00c7.DR.FATMA G/U00dcL AYGEN";
            8 = TeacherHold;
            9 = F;
        },
                {
            0 = "2013-2014";
            1 = "G/U00dcZ";
            10 = TeacherHold;
            11 = 2;
            12 = "";
            2 = 1;
            3 = "MATH 111";
            4 = "Calculus I";
            5 = 4;
            6 = "5.00";
            7 = "DO/U00c7.DR.G/U00dcRSEL YE/U015e/U0130LOT";
            8 = TeacherHold;
            9 = F;
        },
                {
            0 = "2013-2014";
            1 = "G/U00dcZ";
            10 = TeacherHold;
            11 = 4;
            12 = "";
            2 = 1;
            3 = "PHYS 101";
            4 = "Physics I [CNE]";
            5 = 4;
            6 = "5.00";
            7 = "YRD.DO/U00c7.DR.AR/U0130F /U00d6ZBAY";
            8 = TeacherHold;
            9 = F;
        },
                {
            0 = "2013-2014";
            1 = "G/U00dcZ";
            10 = TeacherHold;
            11 = 9;
            12 = "";
            2 = 1;
            3 = "T/U00dcRK 101";
            4 = "T/U00fcrk Dili I [CNE]";
            5 = 2;
            6 = "2.00";
            7 = "/U00d6/U011eR.G/U00d6R.ARZU AYG/U00dcN";
            8 = TeacherHold;
            9 = F;
        }
    );
}

Answer 5

La respuesta de @David72 funcionó perfectamente para mí. Así que aquí es lo mismo en Swift 3 y URLSesión para su conveniencia. También con algunos errores de impresión añadidos para una depuración más fácil.

func getHttpData(urlAddress : String)
{
    // Asynchronous Http call to your api url, using NSURLSession:
    guard let url = URL(string: urlAddress) else
    {
        print("Url conversion issue.")
        return
    }
    URLSession.shared.dataTask(with: url, completionHandler: { (data, response, error) -> Void in
        // Check if data was received successfully
        if error == nil && 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)
                // Access specific key with value of type String
                // let str = json["key"] as! String
            } catch {
                print(error)
                // Something went wrong
            }
        }
        else if error != nil
        {
            print(error)
        }
    }).resume()
}

Answer 6

Si el JSON original es una matriz, intente esto.

func parseJSON(inputData: NSData) -> Array<NSDictionary>{
    var error: NSError?
    var boardsDictionary = NSJSONSerialization.JSONObjectWithData(inputData, options: NSJSONReadingOptions.MutableContainers, error: &error) as Array<NSDictionary>

    return boardsDictionary
}

Answer 7

ACTUALIZACIÓN: Swift 4

// Asynchronous Http call to your api url, using URLSession:
URLSession.shared.dataTask(with: URL(string: "http://api.site.com/json")!) { (data, response, error) -> Void in
    // Check if data was received successfully
    if error == nil && data != nil {
        do {
            // Convert to dictionary where keys are of type String, and values are of any type
            let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String: Any]
            // Access specific key with value of type String
            let str = json["key"] as! String
        } catch {
            // Something went wrong
        }
    }
}.resume()

Aquí se muestra cómo hacerlo con Swift 2 y NSURLSession:

// Asynchronous Http call to your api url, using NSURLSession:
NSURLSession.sharedSession().dataTaskWithURL(NSURL(string: "http://api.site.com/json")!, completionHandler: { (data, response, error) -> Void in
    // Check if data was received successfully
    if error == nil && data != nil {
        do {
            // Convert NSData to Dictionary where keys are of type String, and values are of any type
            let json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! [String:AnyObject]
            // Access specific key with value of type String
            let str = json["key"] as! String
        } catch {
            // Something went wrong
        }
    }
}).resume()

Answer 8

//
//  ViewController.swift
//  Test2
//
//  Created by fingent on 11/08/15.
//  Copyright (c) 2015 fingent. All rights reserved.
//

import UIKit

class ViewController: UIViewController,NSURLConnectionDelegate

{
lazy var data = NSMutableData()

    @IBAction func t1(sender: AnyObject) {
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        startConnection()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func startConnection(){
        let urlPath: String = "https://api.github.com/users/mralexgray"
        var url: NSURL = NSURL(string: urlPath)!
        var request: NSURLRequest = NSURLRequest(URL: url)
        var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)!
        connection.start()
    }

    func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
        self.data.appendData(data)
    }

    func buttonAction(sender: UIButton!){
        startConnection()
    }

    func connectionDidFinishLoading(connection: NSURLConnection!) {
        var err: NSError
        // throwing an error on the line below (can''t figure out where the error message is)
        var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
        println(jsonResult)
    }


}