create an app to retrieve a list of locations and display on a map in swift

main.swift
import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    var mapView: MKMapView!
    var locationManager: CLLocationManager!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Initialize mapView
        mapView = MKMapView(frame: view.frame)
        mapView.showsUserLocation = true
        mapView.delegate = self
        view.addSubview(mapView)

        // Initialize locationManager
        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
    }

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if status == .authorizedWhenInUse {
            locationManager.requestLocation()
        }
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let userLocation = locations.last {
            let region = MKCoordinateRegion(center: userLocation.coordinate, latitudinalMeters: 10000, longitudinalMeters: 10000)
            mapView.setRegion(region, animated: true)
        }
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print(error.localizedDescription)
    }
    
}
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43 lines

main.swift
import Alamofire
import SwiftyJSON

let url = "https://api.yelp.com/v3/businesses/search?term=food&location=San+Francisco"

let headers: HTTPHeaders = [
    "Authorization": "Bearer ACCESS_TOKEN",
    "Accept": "application/json"
]

AF.request(url, headers: headers).responseJSON { response in
    switch response.result {
    case .success(let value):
        let json = JSON(value)
        let businesses = json["businesses"].arrayValue
        
        for business in businesses {
            let name = business["name"].stringValue
            let latitude = business["coordinates"]["latitude"].doubleValue
            let longitude = business["coordinates"]["longitude"].doubleValue
            
            let annotation = MKPointAnnotation()
            annotation.title = name
            annotation.coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
            mapView.addAnnotation(annotation)
        }
    case .failure(let error):
        print(error.localizedDescription)
    }
}
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