How get list value in Userdefaults - swift3

Question

I have data with json in one func 1 get data have 1 list value but I go out func call value with userdefault I get 1 value.
func getdevices() {
var token = UserDefaults.standard.string(forKey: "token")
print("token", token)
var username = UserDefaults.standard.string(forKey: "username")
print("username", username)
let url: URL = URL(string: "/public/devices")!
let request: NSMutableURLRequest = NSMutableURLRequest(url: url)
request.httpMethod = "Get"
request.setValue(token , forHTTPHeaderField: "token")
request.setValue(username, forHTTPHeaderField: "username")
var responseError: NSError?
var response: URLResponse?
var urlData: Data?
do {
urlData = try NSURLConnection.sendSynchronousRequest(request as URLRequest, returning:&response)
} catch let error as NSError {
responseError = error
urlData = nil
}
if ( urlData != nil ) {
let res = response as! HTTPURLResponse!;
print("Response code: %ld tra ve" , res?.statusCode);
if ((res?.statusCode)! >= 200 && (res?.statusCode)! < 300)
{
//let responseData:NSString = NSString(data:urlData!, encoding:String.Encoding.utf8.rawValue)!
if let json = try? JSONSerialization.jsonObject(with: urlData!, options: []) as? [String : Any],
//let dataArray = json?["status"] as? [String : Any],
let items = json?["units"] as? [[String : Any]] {
for item in items {
var lat = item["latitude"] as? String
UserDefaults.standard.set(lat, forKey: "latitude")
var test = UserDefaults.standard.double(forKey: "latitude")
print("test", test)
var long = item["longitude"] as? String
UserDefaults.standard.set(long, forKey: "longitude")
print("long", long)
var devid = item["devid"] as? String
UserDefaults.standard.set(devid, forKey: "devid")
var devname = item["devname"] as? String
UserDefaults.standard.set(devname, forKey: "devname")
var speed = item["speed"] as? String
UserDefaults.standard.set(speed, forKey: "speed")
var statustt = item["status"] as? String
UserDefaults.standard.set(statustt, forKey: "statusxe")
var drivername = item["drivername"] as? String
UserDefaults.standard.set(drivername, forKey: "drivername")
var address = item["address"] as? String
UserDefaults.standard.set(address, forKey: "address")
print("address", address)
}
}
}
}
}
But when the app exists the func it doesn't get the list data, it has one value.
override func viewDidAppear(_ animated: Bool) {
GMSServices.provideAPIKey("AIzaSyB2IJzNc2s5km1qvdwAePDEat1OdPsOFVA")
guard let address = UserDefaults.standard.string(forKey: "address") else {return}
getdevices()
var lat = UserDefaults.standard.double(forKey: "latitude")
var long = UserDefaults.standard.double(forKey: "longitude")
var devname = UserDefaults.standard.string(forKey: "devname")
var speed = UserDefaults.standard.string(forKey: "speed")
print("lat", lat)
print("long", long)
print("address***", address)
let camera = GMSCameraPosition.camera(withLatitude: lat, longitude: long, zoom: 10)
let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
view = mapView
let marKer = GMSMarker()
marKer.position = CLLocationCoordinate2D(latitude: lat, longitude: long)
marKer.icon = UIImage(named: "vehicle_105")
marKer.title = "Biển số \(devname)"
//marKer.title = "Speed \(speed)"
marKer.map = mapView
}

Answer 1

You can only store a single object/value under a single key in UserDefaults. The problem is, you are overwriting the value under the same key in each iteration of your loop. What you should do is create an array before the loop, add the values to that array inside the loop and store the array in UserDefaults after the loop finished its iterations.
if let items = json?["units"] as? [[String : Any]] {
var latitudes = [String]()
var longitudes = [String]()
var devids = [String]()
var devnames = [String]()
var speeds = [String]()
var statustts = [String]()
var drivernames = [String]()
var addresses = [String]()
for item in items {
let lat = item["latitude"] as? String
latitudes.append(lat)
let long = item["longitude"] as? String
longitudes.append(long)
let devid = item["devid"] as? String
devids.append(devid)
var devname = item["devname"] as? String
devnames.append(lat)
var speed = item["speed"] as? String
speeds.append(speed)
var statustt = item["status"] as? String
statuses.append(statustt)
var drivername = item["drivername"] as? String
drivernames.append(drivername)
var address = item["address"] as? String
addresses.append(address)
}
UserDefaults.standard.set(latitudes, forKey: "latitude")
UserDefaults.standard.set(longitudes, forKey: "longitude")
UserDefaults.standard.set(devids, forKey: "devid")
UserDefaults.standard.set(devnames, forKey: "devname")
UserDefaults.standard.set(speeds, forKey: "speed")
UserDefaults.standard.set(statustts, forKey: "statusxe")
UserDefaults.standard.set(drivername, forKey: "drivername")
UserDefaults.standard.set(addresses, forKey: "address")
}