ViewController.swift

import UIKit
import MapKit

class ViewController: UIViewController {

    @IBOutlet private weak var mapView: MKMapView!

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func skytree(_ sender: Any) {
        setRegion(latitude: 35.710063, longitude: 139.8107)
    }

    @IBAction func tokyoTower(_ sender: Any) {
        setRegion(latitude: 35.658584, longitude: 139.7454316)
    }

    private func setRegion(latitude: CLLocationDegrees, longitude: CLLocationDegrees) {

        let center = CLLocationCoordinate2D(
            latitude: latitude,
            longitude: longitude
        )

        let span = MKCoordinateSpan(
            latitudeDelta: 0.01,
            longitudeDelta: 0.01
        )

        let region = MKCoordinateRegion(center: center, span: span)

        mapView.setRegion(region, animated: true)
    }
}