1. import coreLocation in your controller.

import CoreLocation

2. Add this function to your view controller.

func getLocationFromPostalCode(postalCode : String){
        let geocoder = CLGeocoder()
        
        geocoder.geocodeAddressString(postalCode) {
            (placemarks, error) -> Void in
            // Placemarks is an optional array of type CLPlacemarks, first item in array is best guess of Address
            
            if let placemark = placemarks?[0] {
                
                if placemark.postalCode == postalCode{
                 // you can get all the details of place here
                      print("\(placemark.locality)")
                      print("\(placemark.country)")
                }
                else{
                   print("Please enter valid zipcode")
                }
            }
        }
    }