Parse JSON with an Optional in swift - ios

Question

Optional({"session":{"_id":"574fe96fa28f9aaadb000034","application_id":41262,"created_at":"2016-06-02T08:08:15Z","device_id":0,"nonce":21576,"token":"5b04f409c06ecf24ad2d9479a1ef7ef78916f864","ts":1464854895,"updated_at":"2016-06-02T08:08:15Z","user_id":0,"id":7274}})
I need to parse and save token from the above dictionary (in Swift)
My request goes like this :
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { data, response, error in
if error != nil {
print("error=\(error)")
return
}
print("response = \(response)")
let dict = NSString(data: data!, encoding: NSUTF8StringEncoding)
print("responseString = \(dict)")
}
task.resume()
Need to parse dict

Answer 1

JSON parsing/mapping can be a pain and time consuming.
I just happen to have made a tool for it :
Jenerator
Download from here and move to /usr/local/bin/
It is a little command line tool written in Swift to generate a Swift model based on a JSON. If I passed it your JSON it gave me back this :
import Foundation
struct SOSession {
var created_at : String
var _id : String
var id : Int
var device_id : Int
var token : String
var updated_at : String
var nonce : Int
var user_id : Int
var ts : Int
var application_id : Int
init(data:[String:AnyObject]) {
self.created_at = (data["created_at"] as? String) ?? ""
self._id = (data["_id"] as? String) ?? ""
self.id = (data["id"] as? Int) ?? 0
self.device_id = (data["device_id"] as? Int) ?? 0
self.token = (data["token"] as? String) ?? ""
self.updated_at = (data["updated_at"] as? String) ?? ""
self.nonce = (data["nonce"] as? Int) ?? 0
self.user_id = (data["user_id"] as? Int) ?? 0
self.ts = (data["ts"] as? Int) ?? 0
self.application_id = (data["application_id"] as? Int) ?? 0
}
static func fromSource(urlString : String) -> SOSession? {
guard let url = NSURL(string: urlString), data = NSData(contentsOfURL: url) else {
return nil
}
do {
let json = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers)
if let outerDict = json as? [String:AnyObject], let dict = outerDict["session"] as? [String:AnyObject] {
return SOSession(data: dict)
}
} catch {}
return nil
}
}
Getting the Token then becomes as simple as this :
let myToken = SOSession.fromSource("someUrl")?.token
To use Jenerator I saved your JSON in a file on my desktop and ran in terminal :
jenerator "$HOME/Desktop/so-1.json" StackOverflowQuestion1 SO
jenerator "path-to-file-with-json" save-file-name class-prefix
You can now copy the generator code to your project.

Answer 2

In Swift 4:
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data = data, error == nil else {
print(error?.localizedDescription ?? "No data")
return
}
let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
if let data = responseJSON as? [String: Any] {
if let success = data["success"] as? Int {
if success == 1 {
self.dataArray = data["results"] as! Array
label.text = self.dataArray[row]["id"] as? String
// parse in similar fashion
}
}
}
}