parsing JSON it's not working in Swift - ios

Question

I'm creating a simple app that shows the details of every character fo Star Wars using SWAPI. Now i'm trying to get the species but Xcode is telling me that found a nil while unwrapping an optional value when is trying to print _species. Here's the code:
func DownlaodCompleted(complete: DownloadComplete) {
let url = NSURL(string: _urlperson)!
Alamofire.request(.GET, url).responseJSON { (response: Response<AnyObject, NSError>) -> Void in
let result = response.result
if let dict = result.value as? Dictionary<String, AnyObject> {
if let height = dict["height"] as? String {
self._height = height
}
if let gender = dict["gender"] as? String {
self._gender = gender
}
if let birthYear = dict["birth_year"] as? String {
self._birthYear = birthYear
}
if let species = dict["species"] as? [Dictionary<String, String>] {
let urlSpecies = NSURL(string: self._urlSpecies)!
Alamofire.request(.GET, urlSpecies).responseJSON(completionHandler: { (response2: Response<AnyObject, NSError>) -> Void in
let result = response2.result
if let speciesDict = result.value as? Dictionary<String, AnyObject> {
if let name = speciesDict["name"] as? String {
self._species = name
}
}
})
}
print(self._species)
print(self._height)
}
}
}
and here the class of Constants:
let URL_BASE = "http://swapi.co"
let URL_PEOPLE = "/api/people/"
let URL_SPECIES = "/api/species/1/"
typealias DownloadComplete = () -> ()

Answer 1

Here's sample code that I used after creating an empty "Single View Project", and adding the 2 "pods" Alamofire, and SwiftyJSON to the project.
The sample code has one of your URLs and a commented out URL to another site.
import UIKit
import Alamofire
import SwiftyJSON // No such module "SwiftyJSON"
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet var tableView: UITableView!
var arrResults = [[String:AnyObject]]() //Array of dictionary
override func viewDidLoad() {
super.viewDidLoad()
self.view.frame = CGRect(x: 0, y: 0, width: 320, height: 480)
self.tableView = UITableView(frame:self.view!.frame)
self.tableView!.delegate = self
self.tableView!.dataSource = self
self.tableView!.registerClass(UITableViewCell.self, forCellReuseIdentifier: "jsonCell")
self.view?.addSubview(self.tableView)
Alamofire.request(.GET, "http://swapi.co/api/people/?format=json").responseJSON { (responseData) -> Void in
let swiftyJsonVar = JSON(responseData.result.value!)
for element in swiftyJsonVar["results"].arrayValue {
let name = element["name"].string!
let homeworld = element["homeworld"].string!
let object : Dictionary<String, String> = ["name": name, "homeworld": homeworld]
self.arrResults.append(object)
}
if self.arrResults.count > 0 {
self.tableView.reloadData()
}
}
// Alamofire.request(.GET, "http://api.androidhive.info/contacts/").responseJSON { (responseData) -> Void in
// let swiftyJsonVar = JSON(responseData.result.value!)
//
// if let resData = swiftyJsonVar["contacts"].arrayObject {
// self.arrResults = resData as! [[String:AnyObject]]
// }
// if self.arrResults.count > 0 {
// self.tableView.reloadData()
// }
// }
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "jsonCell")
var dict = arrResults[indexPath.row]
// Use these lines with: "http://swapi.co/api/people/?format=json"
cell.textLabel?.text = dict["name"] as? String
cell.detailTextLabel?.text = dict["homeworld"] as? String
// Use these lines with: "http://api.androidhive.info/contacts/"
// cell.textLabel?.text = dict["name"] as? String
// cell.detailTextLabel?.text = dict["email"] as? String
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arrResults.count
}
}