how to create mapkit annotations by using data json data from server? - json

Question

I read from my server and print it out in my xcode project. But when I tried to represent the json code to show mapkit annotations according to latitude and longitude from the server it would not work.
Here is my structure:
struct User {
var locaitonid: String
var latitude: Double
var longitude: Double
var cityName: String
init(_ dictionary: [String: Any]) {
self.locaitonid = dictionary["location_id"] as? String ?? ""
self.latitude = dictionary["latitude"] as? Double ?? 0.0
self.longitude = dictionary["longitude"] as? Double ?? 0.0
self.cityName = dictionary["city_name"] as? String ?? ""
}
Here is my viewController code:
class ViewController: UIViewController {
var model = [User]()
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
guard let url = URL(string: "http://web server link ") else {return}
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let dataResponse = data,
error == nil else {
print(error?.localizedDescription ?? "Response Error")
return }
do{
//here dataResponse received from a network request
let jsonResponse = try JSONSerialization.jsonObject(with:
dataResponse, options: [])
// print(jsonResponse) //Response result
guard let jsonArray = jsonResponse as? [[String: Any]] else {
return
}
for dic in jsonArray{
let annotation = MKPointAnnotation()
annotation.title = (dic["location_id"] as! String)
annotation.subtitle = (dic["city_name"]as! String)
annotation.coordinate = CLLocationCoordinate2D(latitude: dic["latitude"]as!Double, longitude: dic["longitude"]as!Double)
self.mapView.addAnnotations([annotation])
self.mapView.showAnnotations([annotation], animated: true)
}
} catch let parsingError {
print("Error", parsingError)
}
}
task.resume()
}

Answer 1

Try the following code
class ViewController: UIViewController {
var model = [User]()
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
guard let url = URL(string: "http://web server link ") else {return}
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let dataResponse = data,
error == nil else {
print(error?.localizedDescription ?? "Response Error")
return }
do{
//here dataResponse received from a network request
let jsonResponse = try JSONSerialization.jsonObject(with:
dataResponse, options: [])
// print(jsonResponse) //Response result
guard let jsonArray = jsonResponse as? [[String: Any]] else {
return
}
for dic in jsonArray{
let annotation = MKPointAnnotation()
annotation.title = (dic["location_id"] as! String)
annotation.subtitle = (dic["city_name"]as! String)
annotation.coordinate = CLLocationCoordinate2D(latitude: dic["latitude"]as!Double, longitude: dic["longitude"]as!Double)
DispatchQueue.main.async {
self.mapView.addAnnotations([annotation])
self.mapView.showAnnotations([annotation], animated: true)
}
}
} catch let parsingError {
print("Error", parsingError)
}
}
task.resume()
}