Anthony Roani Anthony Roani - 7 months ago 17
Swift Question

NSJSONSerialization return nil with a valid json

I try to parse a response which return a valid JSON with NSJSonSerialization. But it returns nil with no error. It works with another JSON response.

I did some search, and this could be a problem with the encoding of the JSON. I don't know how to solve it. Any idea ?

let url: NSURL = NSURL(string: urlPath)!
self.searchRequest = NSMutableURLRequest(URL: url)
if let searchRequest = self.searchRequest {
searchRequest.HTTPMethod = "GET"
let authString : String = SNCF.APIKey + ":" + ""
let authData : NSData = authString.dataUsingEncoding(NSASCIIStringEncoding)!
let authValue : String = "Basic " + authData.base64EncodedStringWithOptions(.EncodingEndLineWithCarriageReturn)
searchRequest.setValue(authValue, forHTTPHeaderField: "Authorization")

let queue:NSOperationQueue = NSOperationQueue()
NSURLConnection.sendAsynchronousRequest(searchRequest, queue: queue, completionHandler:{ (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in

do {
//HERE JSONRESULT WILL BE NIL
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? [String: [AnyObject]] {
print("ASynchronous\(jsonResult)")
if let places = jsonResult["stop_areas"] as? [[String:AnyObject]]{
for placeDictionary in places {
if let labelText = placeDictionary["label"] as? String {
self.resultDatasource.append(labelText)
}
}
self.resultTableView.reloadData()
}
}
//HERE NO ERROR IS CATCHED
} catch let error as NSError {
print(error.localizedDescription)
}
})


Piece of my json response :

{
"disruptions": [],
"pagination": {
"start_page": 0,
"items_on_page": 100,
"items_per_page": 100,
"total_result": 3053
},
"stop_areas": [
{
"codes": [
{
"type": "CR-CI-CH",
"value": "0080-251967-BV"
}
],
"name": "gare de Perl",
"links": [],
"coord": {
"lat": "0",
"lon": "0"
},
"label": "gare de Perl",
"timezone": "Europe/Paris",
"id": "stop_area:OCE:SA:80251967"
},
{
...
},
//stop_areas dictionaries object...
], //end stop_areas array of dictionaries
"links": [
{
"href": "https://api.sncf.com/v1/coverage/sncf/stop_areas/{stop_areas.id}",
"type": "stop_areas",
"rel": "stop_areas",
"templated": true
},
{
"href": "https://api.sncf.com/v1/coverage/sncf/stop_areas?start_page=1",
"type": "next",
"templated": false
},
{
"href": "https://api.sncf.com/v1/coverage/sncf/stop_areas?start_page=30.52",
"type": "last",
"templated": false
},
{
"href": "https://api.sncf.com/v1/coverage/sncf/stop_areas",
"type": "first",
"templated": false
}
],
"feed_publishers": [
{
"url": "",
"id": "sncf",
"license": "",
"name": ""
}
]
}

Answer

The type of the JSON is [String: AnyObject] not [String: [AnyObject]]