I want to take out the coordinates acquired in the delegate - swift

Question

I wrote a program that uses LocationManagerDelegate to display coordinates in the debug area whenever the current location changes. Got an error when retrieving coordinates
Can not use instance member 'locationManager' within property initializer; property initializers run before 'self' is available
import UIKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate{
var locationManager: CLLocationManager!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
setUpLocationManager()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setUpLocationManager() {
locationManager = CLLocationManager()
guard let locationManager = locationManager else {return}
locationManager.requestWhenInUseAuthorization()
let status = CLLocationManager.authorizationStatus()
if status == .authorizedWhenInUse {
locationManager.delegate = self
locationManager.distanceFilter = 10
locationManager.startUpdatingLocation()
printLocation()
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) ->Optional<Any> {
let location = locations.first
let latitude = location?.coordinate.latitude
let longitude = location?.coordinate.longitude
let latlong = [latitude, longitude]
return latlong
}
let myLocation = locationManager()
func printLocation() {
print("test\(myLocation)")
}
}
test (Function)
is output
let myLocation = locationManager ()
When you change to
let myLocation = locationManager

Answer 1

Your code contains a few mistakes.
The error occurs because you cannot execute the affected line on the top level of the class.
First of all you must not change signatures of delegate methods. This custom delegate method
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) ->Optional<Any> { ...
will never be called.
And apart from that why do you declare the return type as Any? although it's supposed to be [CLLocationCoordinate2D]?
Create the location manager immediately, replace
var locationManager: CLLocationManager!
with
let locationManager = CLLocationManager()
In setUpLocationManager() delete the lines
locationManager = CLLocationManager()
guard let locationManager = locationManager else {return} // this line is completely pointless anyway
printLocation()
The delegate method didUpdateLocations is called periodically and asynchronously. Print the result inside the method
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.first else { return }
let latitude = location.coordinate.latitude
let longitude = location.coordinate.longitude
let latlong = [latitude, longitude]
print("test", latlong)
}
Delete
let myLocation = locationManager()
func printLocation() {
print("test\(myLocation)")
}