How do I save annotations? - swift

Question

I have my code so it puts an annotation on the map each time the user clicks a button, but when the user closes out of the app, the annotation disappears. How do I make it so the annotations stays on the map even when the user closes the app? Below is my code:
import UIKit
import CoreLocation
import MapKit
class UpdateCar: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
#IBOutlet weak var lblLocation: UILabel!
var locationManager = CLLocationManager()
var myPosition = CLLocationCoordinate2D()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(manager: CLLocationManager!, didUpdateToLocation newLocation: CLLocation!, fromLocation oldLocation: CLLocation!) {
println("Updating Car Location \(newLocation.coordinate.latitude) , \(newLocation.coordinate.longitude) ")
myPosition = newLocation.coordinate
locationManager.stopUpdatingLocation()
lblLocation.text = "\(newLocation.coordinate.latitude) , \(newLocation.coordinate.longitude)"
}
#IBAction func findUserLocationAndDropPin(sender: UIButton) {
var userLocationCoordinates = CLLocationCoordinate2DMake(locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude)
var pinForUserLocation = MKPointAnnotation()
pinForUserLocation.coordinate = userLocationCoordinates
mapView.addAnnotation(pinForUserLocation)
mapView.showAnnotations([pinForUserLocation], animated: true)
}
}

Answer 1

You have to save it in a persistent store.
Few options:
CoreData, the native way of saving data, recommended, not too easy
NSUserDefaults, usually thought for small stuff, also native, not recommended, very easy though
Another API for managing a persistent store like Realm (similar to CoreData, a little easier but not native)

Answer 2

//when I need to save for example, the last date on which the user login my app will use the setObject function, this will save a value ("10/05/2015") in the "lastlogin" key
var lastLogin = "10/05/2015"
NSUserDefaults.standarUserDefaults().setObject(lastLogin, forkey: "lastLogin")
//And when I need to retrieve the stored value in the "lastlogin" key which I use is "objectForKey" function
NSUserDefaults.standarUserDefaults().objectForKey("lastLogin")
see following link:
https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/index.html#//apple_ref/occ/instm/NSUserDefaults/setObject:forKey: