Showing drop pin after relaunch app? - ios

Question

I have application with map where you can make an annotation by dropping a pin. How can I save the annotation, so you can see it when the application is closed and re-opened?
My code's for annotation
func addAnnotation(gesture: UIGestureRecognizer) {
if gesture.state == UIGestureRecognizerState.Began {
var touch = gesture.locationInView(self.Mapa)
var coordinate = Mapa.convertPoint(touch, toCoordinateFromView: self.Mapa)
var location = CLLocationCoordinate2D(latitude: coordinate.latitude, longitude: coordinate.longitude)
var loc = CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)
CLGeocoder().reverseGeocodeLocation(loc, completionHandler: { (placemarks, error) -> Void in
if error == nil {
let placemark = CLPlacemark(placemark: placemarks[0] as! CLPlacemark)
self.cislo = placemark.subThoroughfare != nil ? placemark.subThoroughfare : ""
self.adresa = placemark.thoroughfare != nil ? placemark.thoroughfare : ""
self.mesto = placemark.subAdministrativeArea != nil ? placemark.subAdministrativeArea : ""
self.krajina = placemark.administrativeArea != nil ? placemark.administrativeArea : ""
let annotation = MKPointAnnotation()
annotation.coordinate = placemark.location.coordinate
annotation.title = self.adresa! + " " + self.cislo!
self.Mapa.addAnnotation(annotation)
println("Špendlík pridaný!")
}
})
}
}
In case you want to see whole code
http://pastebin.com/d89kTrL7

Answer 1

i would save the data into userdefaults as
func addAnnotation(gesture: UIGestureRecognizer) {
if gesture.state == UIGestureRecognizerState.Began {
var touch = gesture.locationInView(self.Mapa)
var coordinate = Mapa.convertPoint(touch, toCoordinateFromView: self.Mapa)
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setDouble(coordinate.longitude, forKey: "longitudeNameKey")
defaults.setDouble(coordinate.latitude, forKey: "latitudeNameKey")
defaults.synchronize()
var location = CLLocationCoordinate2D(latitude: coordinate.latitude, longitude: coordinate.longitude)
var loc = CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)
CLGeocoder().reverseGeocodeLocation(loc, completionHandler: { (placemarks, error) -> Void in
if error == nil {
let placemark = CLPlacemark(placemark: placemarks[0] as! CLPlacemark)
self.cislo = placemark.subThoroughfare != nil ? placemark.subThoroughfare : ""
self.adresa = placemark.thoroughfare != nil ? placemark.thoroughfare : ""
self.mesto = placemark.subAdministrativeArea != nil ? placemark.subAdministrativeArea : ""
self.krajina = placemark.administrativeArea != nil ? placemark.administrativeArea : ""
let annotation = MKPointAnnotation()
annotation.coordinate = placemark.location.coordinate
annotation.title = self.adresa! + " " + self.cislo!
self.Mapa.addAnnotation(annotation)
println("Špendlík pridaný!")
}
})
}
}
You can save info to NSUserDefaults when the annotations are created.And somewhere in viewDidLoad method you just get all the info from user defaults and then display the annotations.
override func viewDidLoad() {
super.viewDidLoad()
loadAnnotationFromUserDefaults()
}
use loadAnnotationFromUserDefaults method to deserializes the list of coordinates previously saved to NSUserDefaults. Through this method you also load the coordinates as annotations on the map view.
func loadAnnotationFromUserDefaults(){
let defaults = NSUserDefaults.standardUserDefaults()
let long= defaults.doubleForKey("longitudeNameKey")
let lat = defaults.doubleForKey("latitudeNameKey")
println("\(long)")
println("\(lat)")
//You got the coordinates that you lost after terminating now load the coordinates as annotation to mapview
}
You should set new coordinates and terminate application ..notice the coordinates..now again reopen your application ..now you get again those see on the log
P.S code not tested and should change according to your application architecture...only take it as a reference.
Here is the demo project i set up for you
https://drive.google.com/open?id=0B6dTvD1JbkgBRnN2QllWWlJqd0E&authuser=0