Having trouble putting in the coordinates in global variable [CLgeocoder, swift4]

Question

I am trying to create an app that will find the sunrise time and I am using this web API that requires both coordinates of the location.

This is my solution for to get the latitude and longitude but then it does not let me store the coordinates in the variables.(The coordinates must be float)

Why doesn't it let me put those numbers inside the variables ? or is there a better way of implementing this?

   let lattitude: Float = 0.0000
   let longitude: Float = 0.0000


    let address = "Tokyo"
            CLGeocoder().geocodeAddressString(address) { placemarks, error in
                if let lat = placemarks?.first?.location?.coordinate.latitude{
                    print("lattitude : \(lat)")
                    lattitude = lat

                }
                if let lng = placemarks?.first?.location?.coordinate.longitude{
                    print("longtitude : \(lng)")
                    longtitude = lng
                }
            }

Answer 1

You have specified that the variables lattitude and longitude as let. These are constants and cannot have their values changed after initialization. Change the let to var.

Also another problem is placemarks?.first?.location?.coordinate.latitude and placemarks?.first?.location?.coordinate.longitude returns type double. You cannot assign a double to a float.

You can either try casting lat/lng to type Float.

lattitude = Float(lat)

longitude = Float(lng)

Or changing the lattitude and longitude variable to type Double.

var lattitude: Double = 0.0000

var longitude: Double = 0.0000