Converting CLLocationCoordinate2D to a String that can be stored

Question

I'm trying to save the coordinates of a user while in one ViewController so that it can be used to create an Annotation that can displayed in another ViewController.

In the view controller that stores the coordinates I'm using the code

NSUserDefaults.standardUserDefaults().setObject( Location, forKey: "Location")

In the map view controller that displays the annotation I'm trying to get the coordinates using the code

let Location = NSUserDefaults.standardUserDefaults().stringForKey("Location") var Annotation = MKPointAnnotation() Annotation.coordinate = Location

It is telling me that the value of type String? to a value of type CLLocationCoordinate2D.

So how do I convert the CLLocationCoordinate2D coordinates into a value of type String?

possible duplicate of converting a CLLocationCoordinate2D type to number or string — Icaro
– Icaro, Commented Jun 12, 2015 at 6:53

Dharmesh Kheni · Accepted Answer · 2015-06-13 05:07:38Z

This way you can store Locations to NSUserDefaults:

//First Convert it to NSNumber. let lat : NSNumber = NSNumber(double: Location.latitude) let lng : NSNumber = NSNumber(double: Location.longitude) //Store it into Dictionary let locationDict = ["lat": lat, "lng": lng] //Store that Dictionary into NSUserDefaults NSUserDefaults.standardUserDefaults().setObject(locationDict, forKey: "Location")

After that you can access it this way:

//Access that stored Values let userLoc = NSUserDefaults.standardUserDefaults().objectForKey("Location") as! [String : NSNumber] //Get user location from that Dictionary let userLat = userLoc["lat"] let userLng = userLoc["lng"] var Annotation = MKPointAnnotation() Annotation.coordinate.latitude = userLat as! CLLocationDegrees //Convert NSNumber to CLLocationDegrees Annotation.coordinate.longitude = userLng as! CLLocationDegrees //Convert NSNumber to CLLocationDegrees

UPDATE:

HERE is your Example project.

So for some reason whenever I press the button on the other view controller to save the location and a segue is performed to another view controller that displays the map view the annotation isn't being displayed.

Romain TAILLANDIER · Accepted Answer · 2015-06-12 07:45:59Z

extension CLLocationCoordinate2D:Printable { init(coords : String) { var fullNameArr = split(coords) {$0 == ";"} self.latitude = NSNumberFormatter().numberFromString(fullNameArr[0])!.doubleValue self.longitude = (fullNameArr.count > 1) ? NSNumberFormatter().numberFromString(fullNameArr[1])!.doubleValue : 0 } public var description : String { return "\(self.latitude);\(self.longitude)" } }

Then use as in your sample code :

 var coord = CLLocationCoordinate2D(latitude: 3.2, longitude: 6.4) NSUserDefaults.standardUserDefaults().setObject(coord.description, forKey: "Location") var readedCoords = CLLocationCoordinate2D(coords: NSUserDefaults.standardUserDefaults().stringForKey("Location")!)

Darius Miliauskas · Accepted Answer · 2016-03-07 14:17:22Z

You can store the latitude or the longitude (or both in a dictionary or a tuple). The way to wrap them in String:

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { var locValue:CLLocationCoordinate2D = manager.location!.coordinate var lat : String = locValue.latitude.description var lng : String = locValue.longitude.description //do whatever you want with lat and lng }

Serge Hulne · Accepted Answer · 2021-12-18 18:08:04Z

Using an sprint kind of formatting:

func Coord2String(location : CLLocationCoordinate2D) -> String { return String(format : "latitude : %f, longitude : %f", location.latitude, location.longitude) }

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