Swift - Getting address from coordinates

I have a local search that creates annotations for each search result. I'm trying to add an call out accessory to each of the annotations, and once that will be pressed, the Maps app will open and set directions on how to get to the certain location.

The problem that I am having is that in order for the call out accessory to work correctly, you have to get the address using place marks in the Address Book import. I've done plenty of searching and can't figure out how to set it up correctly where I can covert the annotation coordinates into a kABPersonAddressStreetKey so the Maps app can read it correctly. Below is my code for the search function, and the open Maps app function.

func performSearch() -> MKMapItem {

    matchingItems.removeAll()
    let request = MKLocalSearchRequest()
    request.naturalLanguageQuery = searchText.text
    request.region = mapView.region

    let search = MKLocalSearch(request: request)

    search.startWithCompletionHandler({(response:
        MKLocalSearchResponse!,
        error: NSError!) in

        if error != nil {
            println("Error occured in search: \(error.localizedDescription)")
        } else if response.mapItems.count == 0 {
            println("No matches found")
        } else {
            println("Matches found")

            for item in response.mapItems as! [MKMapItem] {
                println("Name = \(item.name)")
                println("Phone = \(item.phoneNumber)")

                self.matchingItems.append(item as MKMapItem)
                println("Matching items = \(self.matchingItems.count)")

                var annotation = MKPointAnnotation()
                var coordinates = annotation.coordinate
                var location = CLLocation(latitude: annotation.coordinate.latitude, longitude: annotation.coordinate.longitude)
                var street = // Insert code here for getting address from coordinates
                var addressDictionary = [String(kABPersonAddressStreetKey): street]
                var placemark = MKPlacemark(coordinate: coordinates, addressDictionary: addressDictionary)
                var mapItem = MKMapItem(placemark: placemark)
                return mapItem

                annotation.coordinate = item.placemark.coordinate
                annotation.title = item.name
                self.mapView.addAnnotation(annotation)

            }
        }
    })
}


func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!,
    calloutAccessoryControlTapped control: UIControl!) {
        let location = view.annotation as! FirstViewController
        let launchOptions = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
        location.performSearch().openInMapsWithLaunchOptions(launchOptions)
}

Any help would be greatly appreciated, thanks in advance.