Swift - How to get OpenWeatherMap JSON Data? - ios

Question

The following app should get the user's current location and then display the Name and Temperature of that location using OpenWeatherMap.
import UIKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var location: UILabel!
#IBOutlet weak var temperature: UILabel!
var locationManager: CLLocationManager = CLLocationManager()
var startLocation: CLLocation!
func extractData(weatherData: NSData) {
let json = try? NSJSONSerialization.JSONObjectWithData(weatherData, options: []) as! NSDictionary
if json != nil {
if let name = json!["name"] as? String {
location.text = name
}
if let main = json!["main"] as? NSDictionary {
if let temp = main["temp"] as? Double {
temperature.text = String(format: "%.0f", temp)
}
}
}
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let latestLocation: AnyObject = locations[locations.count - 1]
let lat = latestLocation.coordinate.latitude
let lon = latestLocation.coordinate.longitude
// Put together a URL With lat and lon
let path = "http://api.openweathermap.org/data/2.5/weather?lat=\(lat)&lon=\(lon)&appid=2854c5771899ff92cd962dd7ad58e7b0"
print(path)
let url = NSURL(string: path)
let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { (data, response, error) in
dispatch_async(dispatch_get_main_queue(), {
self.extractData(data!)
})
}
task.resume()
}
func locationManager(manager: CLLocationManager,
didFailWithError error: NSError) {
}
override func viewDidLoad() {
super.viewDidLoad()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
startLocation = nil
}
}
I've been learning how to get data from OpenWeatherMap following this tutorial:
https://www.youtube.com/watch?v=r-LZs0De7_U
The app crashes at:
self.extractData(data!)
as data is equal to nil, this shouldn't be happening as when I copy and paste the printed path into my web browser, the data is there. I'm sure I've followed the tutorial correctly, so what's the problem and how do I fix it?

Answer 1

The problem is with Transport Security - which causes issues for lots of us. Here's one of the SO answers explaining how to resolve it Transport security has blocked a cleartext HTTP
If you make the setting in your plist - set the NSAllowsArbitraryLoads key to YES under NSAppTransportSecurity dictionary in your .plist file - then it works.