Get location results from another class in swift

Question

How to get location results from one class (GPSLocation) from (userLocation.swift) and use them in another class in file (target.swift)..?

I need countryCode, city, longitude and latitude from:

userLocation.swift

import UIKit
import MapKit

class GPSLocation {

func getGPSLocation(completion: () -> Void) {

    let locManager = CLLocationManager()
    var currentLocation: CLLocation!
    locManager.desiredAccuracy = kCLLocationAccuracyBest

    if (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse || CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways) {

        currentLocation = locManager.location

        let latitude = String(format: "%.7f", currentLocation.coordinate.latitude)
        let longitude = String(format: "%.7f", currentLocation.coordinate.longitude)
        let location = CLLocation(latitude: currentLocation.coordinate.latitude, longitude: currentLocation.coordinate.longitude)

        fetchCountryAndCity(location: location) { countryCode, city in
            // debugPrint("Country:", countryCode)
            // debugPrint("City:", city)
        }
        // debugPrint("Latitude:", latitude)
        // debugPrint("Longitude:", longitude)
    }
}

//MARK: Find countryCode & City name from longitude & latitude

func fetchCountryAndCity(location: CLLocation, completion: @escaping (String, String) -> ()) {
    CLGeocoder().reverseGeocodeLocation(location) { placemarks, error in
        if let error = error {
            debugPrint(error)
        } else if let countryCode = placemarks?.first?.isoCountryCode,
            let city = placemarks?.first?.locality {
            completion(countryCode, city)
        }
    }
}
}

And print them in file:

target.swift

import Foundation

class Post {

 fileprivate func Post() {

    func getLocation() {
        // Get user GPS location (longitude, latitude, Country Code, City)
        let getUserLocation = GPSLocation()
        getUserLocation.getGPSLocation {
            debugPrint("Country:", countryCode)
            debugPrint("City:", city)
            debugPrint("Latitude:", latitude)
            debugPrint("Longitude:", longitude)
        }
    }

  }

}

Thank you in advance..!!!

Answer 1

You can define a closure to run after getting location in your GPSLocation class. You can achieve it in two way:

You can have a variable of a block code in your GPSLocation class like below :

typealias completionHanlder = (_ lat: String, _ lng: String) -> Void
var completion: completionHanlder?

then in your Post class after instantiating GPSLocation you can pass a block of codes like :

getUserLocation.completion = {
       // do any stuff here     
}

OR you can pass a block of code to your getGPSLocation function. here is how to redefine your function :

func getGPSLocation(completion: (_ lat: String, _ lng: String) -> Void) {        
    let locManager = CLLocationManager()
    var currentLocation: CLLocation!
    locManager.desiredAccuracy = kCLLocationAccuracyBest

    if (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse || CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways) {

    currentLocation = locManager.location

    let latitude = String(format: "%.7f", currentLocation.coordinate.latitude)
    let longitude = String(format: "%.7f", currentLocation.coordinate.longitude)
    let location = CLLocation(latitude: currentLocation.coordinate.latitude, longitude: currentLocation.coordinate.longitude)

    fetchCountryAndCity(location: location, completion: { countryCode, city in
        delegate?.fetchedLocationDetails(location: location, countryCode: countryCode, city: city)
    }) { delegate?.failedFetchingLocationDetails(error: $0) }

    debugPrint("Latitude:", latitude)
    debugPrint("Longitude:", longitude)

    completion(latitude, longitude)  // your block of code you passed to this function will run in this way

   }

}

and this would be your Post class :

class Post {

func getLocation() {
    // Get user GPS location (longitude, latitude, Country Code, City)
    let getUserLocation = GPSLocation()
    getUserLocation.getGPSLocation { (lat, lng) in

        debugPrint("Latitude:", lat)
        debugPrint("Longitude:", lng)
        // HERE I NEED to PRINT longitude, latitude, Country Code, City
    }

}
}

This closure you put here would run whenever completion block called in getGPSLocation function as I rewrite your function above.