シンプルにコードから地図を表示します。

ソースコード

MapViewController

import UIKit
import MapKit

final class MapViewController: UIViewController {

    private let mapView: MKMapView = {
        let mapView = MKMapView()
        mapView.translatesAutoresizingMaskIntoConstraints = false
        return mapView
    }()

    fileprivate func setupUI() {
        view.addSubview(mapView)
        mapView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        mapView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
        mapView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true
        mapView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
    }

    override func viewDidLoad() {
        setupUI()
    }
}

mapkitをimportします。

呼び出し元

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let scene = (scene as? UIWindowScene) else {
            return
        }
        let window = UIWindow(windowScene: scene)
        self.window = window
        window.makeKeyAndVisible()

        let vc = MapViewController()
        window.rootViewController = vc
    }
・・・
}

参考