Convert adress input in annotation on the map - SwiftUI - swiftui

Question

I am a beginner so sorry for my question.
I have a map and annotations in a Datas file.
Now I would like the user to be able to register an address with a form.
How do I go from a normal address to a
location: CLLocationCoordinate2D(latitude: 48.8566, longitude: 2.3522)
Thanks for your help

Answer 1

Core Location has a "geocoder", which is what would take a street address and convert it to a CLLocationCoordinate2D.
This is from the official Apple documentation (https://developer.apple.com/documentation/corelocation/converting_between_coordinates_and_user-friendly_place_names):
func getCoordinate( addressString : String,
completionHandler: #escaping(CLLocationCoordinate2D, NSError?) -> Void ) {
let geocoder = CLGeocoder()
geocoder.geocodeAddressString(addressString) { (placemarks, error) in
if error == nil {
if let placemark = placemarks?[0] {
let location = placemark.location!
completionHandler(location.coordinate, nil)
return
}
}
completionHandler(kCLLocationCoordinate2DInvalid, error as NSError?)
}
}
Note that the preceding function uses callback functions and is an asynchronous function. That means that it does not return immediately -- instead, it finishes at an indeterminate time in the future and calls the callback function when it is finished.
Since you tagged the question SwiftUI, the following is a trivial example with SwiftUI:
import SwiftUI
import MapKit
class LocationManager : ObservableObject {
#Published var location : CLLocationCoordinate2D?
func convertAddress(address: String) {
getCoordinate(addressString: address) { (location, error) in
if error != nil {
//handle error
return
}
DispatchQueue.main.async {
self.location = location
}
}
}
private func getCoordinate(addressString : String,
completionHandler: #escaping(CLLocationCoordinate2D, NSError?) -> Void ) {
let geocoder = CLGeocoder()
geocoder.geocodeAddressString(addressString) { (placemarks, error) in
if error == nil {
if let placemark = placemarks?[0] {
let location = placemark.location!
completionHandler(location.coordinate, nil)
return
}
}
completionHandler(kCLLocationCoordinate2DInvalid, error as NSError?)
}
}
}
struct ContentView: View {
#State var addressString = "1600 Pennsylvania Ave, Washington D.C."
#StateObject private var locationManager = LocationManager()
var body: some View {
VStack {
Text("Address: \(addressString)")
if let location = locationManager.location {
Text("Lat: \(location.latitude) Long: \(location.longitude)")
}
}.onAppear {
locationManager.convertAddress(address: addressString)
}
}
}