JSON Data is nil after decoding - ios

Question

Guys I am getting a response for an api call I make. it returns the whole response and I give it to the method like.
completionHandler(response: response, error: nil)
then by doing
print(response.description)
The result is that I get headers statuscode etc.
URL:
removed
Status Code:
200
Headers:
Keep-Alive: timeout=5, max=99
Content-Length: 2423
Server: Apache/2.4.10 (Debian)
SessionID: removed
Content-Type: application/json
Date: Thu, 24 Sep 2015 12:50:14 GMT
Connection: Keep-Alive
Cache-Control: no-cache
Payload:
[{"id":148,"name":"Amsterdam","avatar":"removed","cover":"removed"}]
The part I am mostly interested in is this part
Payload:
[{"id":148,"name":"Amsterdam","avatar":"removed","cover":"removed"}]
Somehow I can't extract that array of json objects. Anyone who can help me out on how to get this?
EDIT: added the method where I receive the response and pass it through
func requestObj(url: Routes, params: Dictionary<String, String>?, completionHandler: (response: Response?, error: NSError?) -> ())
{
self.requestConfig(completionHandler: { () -> () in
if let req = NSMutableURLRequest(urlString: self.config!.api!.baseUrl! + "/v2" + url.rawValue) {
do {
req.addValue(String(self.config!.api!.token!), forHTTPHeaderField: "Token")
req.addValue(String(self.sessionID), forHTTPHeaderField: "SessionID")
let opt = HTTP(req)
opt.start { response in
if let err = response.error {
print("error: \(err.localizedDescription)")
print("opt finished with error info: \(response.description)")
completionHandler(response: nil, error: nil)
}
completionHandler(response: response, error: nil)
//print("data is: \(response.data)") access the response of the data with response.data
}
}
}
}) // request a valid config before doing anything
}
This is called with
adapter.requestObj(APIAdapter.Routes.getMunicipalities, params: nil, completionHandler: {(
response, error) in
if let response = response {
print(response.description)
}
})

Answer 1

For SwiftHTTP, you can get the response body with:
response.data

Answer 2

Have you already tried with "SwiftyJson" you could save the data in a JSON object and then access the data as a Dictionary here's how I deal with the data
import Alamofire
import SwiftyJSON
func RequestImages()
{
Alamofire.request(.GET, "https://api.500px.com/v1/photos",parameters:["consumer_key":"gRU4LletUCA9RiOQhaJBAt62UyRRYUE6vsIcC7fO"])
.responseJSON { _,_,result in
switch result {
case .Success(let data):
let json = JSON(data)
debugPrint(data)
self.Photos = self.ParseJSON(json)
self.performSegueWithIdentifier("ToCollection", sender: self)
case .Failure(_, let error):
print("Request failed with error: \(error)")
}
}
}
here is some code where I use a library called Alamofire where i retrieve a response in JSON, then if data has be found i save the data in a JSON object provided by the SwiftyJSON library
let json = JSON(data)
then I have a collection of an "Image" mode called "Photos" i fill this collection by parsing the JSON data as the following
func ParseJSON(json:JSON)->[Image]
{
//Get Image_URL
var pictures = [Image]()
for result in json["photos"].arrayValue
{
pictures.append(Image(url: result["image_url"].stringValue, name: result["name"].stringValue, news: result["description"].stringValue))
}
debugPrint(pictures)
return pictures
}
I hope my implementation helps you Greetings!

Answer 3

Try this :-
override func viewDidLoad() {
super.viewDidLoad()
get_data_from_url("http://yourURL")
}
func get_data_from_url(url:String) {
let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
Id = label1.text //your request parameters
JId = label2.text //your request parameters
var post:NSString = "uid=\(Id)&jid=\(JId)"
//NSLog("PostData: %#",post);
var url:NSURL = NSURL(string: url)!
var postData:NSData = post.dataUsingEncoding(NSASCIIStringEncoding)!
var postLength:NSString = String( postData.length )
var request:NSMutableURLRequest = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.HTTPBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("*/*", forHTTPHeaderField: "Accept")
var reponseError: NSError?
var response: NSURLResponse?
var urlData: NSData? = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error:&reponseError)
if urlData != nil && reponseError == nil {
let res = response as! NSHTTPURLResponse!;
//NSLog("Response code: %ld", res.statusCode);
if (res.statusCode >= 200 && res.statusCode < 300) {
var responseData:NSString = NSString(data:urlData!, encoding:NSUTF8StringEncoding)!
NSLog("Response ==> %#", responseData)
if Id != nil {
extract_json(urlData!)
}
} else {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = "Connection Failed"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
} else {
var alertView:UIAlertView = UIAlertView()
alertView.title = "Sign in Failed!"
alertView.message = "Connection Failure"
if let error = reponseError {
alertView.message = (error.localizedDescription)
}
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
}
}
func extract_json(data:NSData) {
var error: NSError?
let jsonData:NSArray = NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers , error: &error) as! NSArray
let Id_temp: AnyObject? = ((jsonData)[0] as! NSDictionary)["id"]
let Name_temp: AnyObject? = ((jsonData)[0] as! NSDictionary)["name"]
}
First go to this site and validate your URL
https://chrome.google.com/webstore/detail/advanced-rest-client/hgmloofddffdnphfgcellkdfbfbjeloo?utm_source=chrome-app-launcher-info-dialog ( GOOGLE extenstion )
then replace below given values according to your settings :-
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("*/*", forHTTPHeaderField: "Accept")

Answer 4

Try with this:
NSDictionary *jsonDictionary = [NSJSONSerialization JSONObjectWithData:response options:0 error:&error];
Then you can do [jsonDictionary objectForKey:#""] to retrieve values.
This is Objective C, but I am sure it must be similar in Swift.