How to launch Maps app and start navigation - ios

Question

In my iOS app I have latitude and longitude (CLLocationCoordinate2D) of a place the user would like to reach. I want than, when the relative button is pressed, that Maps application is launched and that street navigation to that place is started too. How can I achieve that? My code up to now is:
#IBAction func launchMapsApp(sender:UIButton) {
if (sender == self.navButton) {
let mapItem = MKMapItem(placemark: MKPlacemark(coordinate: self.currentCoordinates, addressDictionary: nil))
mapItem.name = ""
//You could also choose: MKLaunchOptionsDirectionsModeWalking
let launchOptions = [MKLaunchOptionsDirectionsModeKey : MKLaunchOptionsDirectionsModeDriving, MKLaunchOptionsShowsTrafficKey: true]
mapItem.openInMapsWithLaunchOptions(launchOptions as? [String : AnyObject])
}
}
But with this the Maps app is simply launched and I simply see a map of my state (Italy) and nothing more happens. Maybe, because I have run in only in simulator?
Thanks to all

Answer 1

You were on the right track: This is my swift 2.0 code:
let latitude:CLLocationDegrees = xx.xxxxx
let longitude: CLLocationDegrees = xx.xxxxx
let regiondistance:CLLocationDistance = 10000
let coordinates = CLLocationCoordinate2DMake(latitude, longitude)
let regionspan = MKCoordinateRegionMakeWithDistance(coordinates, regiondistance, regiondistance)
let options = MKLaunchOptionsMapCenterKey:NSValue(MKCoordinate:regionspan.center),MKLaunchOptionsMapSpanKey:NSValue(MKCoordinateSpan:regionspan.span)]
let placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
let mapitem = MKMapItem(placemark: placemark)
mapitem.name = "Name you want"
mapitem.openInMapsWithLaunchOptions(options)
I hope my code gives you some insight.

Answer 2

Your original code looks about right. It's possible, as you said, that the issue was how you were using the simulator. You can set a simulated location via the Debug menu in the simulator (Location -> Custom).
To launch Maps and start navigation to a specific location (as opposed to just opening Maps with a marker at the desired location, as in the other answer), I use this (in Swift 3):
let coordinates = CLLocationCoordinate2DMake(destLatitude, destLongitude)
let placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
let mapitem = MKMapItem(placemark: placemark)
let options = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
mapitem.openInMaps(launchOptions: options)
Hope this helps...