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Preview mapkit003

import SwiftUI
import MapKit

class LocationManager: NSObject, ObservableObject, CLLocationManagerDelegate {
    @Published var region = MKCoordinateRegion()
    private let manager = CLLocationManager()
    override init() {
        super.init()
        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.requestWhenInUseAuthorization()
        manager.startUpdatingLocation()
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        locations.last.map {
            let center = CLLocationCoordinate2D(latitude: $0.coordinate.latitude,   longitude: $0.coordinate.longitude)
            let span = MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01)
            region = MKCoordinateRegion(center: center, span: span)
        }
    }
}

struct ContentView: View {
    @StateObject private var manager = LocationManager()

    var body: some View {
        Map(coordinateRegion: $manager.region, showsUserLocation: true)
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
    }
}



//
//  ViewController.swift
//  MapKit003
//
//  Created by Misato Morino on 2016/08/15.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    var myMapView: MKMapView!
    var myLocationManager: CLLocationManager!

    override func viewDidLoad() {
        super.viewDidLoad()

        // LocationManagerの生成.
        myLocationManager = CLLocationManager()

        // Delegateの設定.
        myLocationManager.delegate = self

        // 距離のフィルタ.
        myLocationManager.distanceFilter = 100.0

        // 精度.
        myLocationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters

        // セキュリティ認証のステータスを取得.
        let status = CLLocationManager.authorizationStatus()

        // まだ認証が得られていない場合は、認証ダイアログを表示.
        if(status != CLAuthorizationStatus.authorizedWhenInUse) {

            print("not determined")
            // まだ承認が得られていない場合は、認証ダイアログを表示.
            myLocationManager.requestWhenInUseAuthorization()
        }

        // 位置情報の更新を開始.
        myLocationManager.startUpdatingLocation()

        // MapViewの生成.
        myMapView = MKMapView()

        // MapViewのサイズを画面全体に.
        myMapView.frame = self.view.bounds

        // Delegateを設定.
        myMapView.delegate = self

        // MapViewをViewに追加.
        self.view.addSubview(myMapView)

        // 中心点の緯度経度.
        let myLat: CLLocationDegrees = 37.506804
        let myLon: CLLocationDegrees = 139.930531
        let myCoordinate: CLLocationCoordinate2D = CLLocationCoordinate2DMake(myLat, myLon) as CLLocationCoordinate2D

        // 縮尺.
        let myLatDist : CLLocationDistance = 100
        let myLonDist : CLLocationDistance = 100

        // Regionを作成.
        let myRegion: MKCoordinateRegion = MKCoordinateRegion(center: myCoordinate, latitudinalMeters: myLatDist, longitudinalMeters: myLonDist);

        // MapViewに反映.
        myMapView.setRegion(myRegion, animated: true)

    }

    // GPSから値を取得した際に呼び出されるメソッド.
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

        print("didUpdateLocations")

        // 配列から現在座標を取得.
        let myLocations: NSArray = locations as NSArray
        let myLastLocation: CLLocation = myLocations.lastObject as! CLLocation
        let myLocation:CLLocationCoordinate2D = myLastLocation.coordinate

        print("\(myLocation.latitude), \(myLocation.longitude)")

        // 縮尺.
        let myLatDist : CLLocationDistance = 100
        let myLonDist : CLLocationDistance = 100

        // Regionを作成.
        let myRegion: MKCoordinateRegion = MKCoordinateRegion(center: myLocation, latitudinalMeters: myLatDist, longitudinalMeters: myLonDist);

        // MapViewに反映.
        myMapView.setRegion(myRegion, animated: true)
    }

    // Regionが変更した時に呼び出されるメソッド.
    func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
        print("regionDidChangeAnimated")
    }

    // 認証が変更された時に呼び出されるメソッド.
    private func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        switch status{
        case .authorizedWhenInUse:
            print("AuthorizedWhenInUse")
        case .authorizedAlways:
            print("AuthorizedAlways")
        case .denied:
            print("Denied")
        case .restricted:
            print("Restricted")
        case .notDetermined:
            print("NotDetermined")
        }
    }
}

Info.plist

<key>NSLocationWhenInUseUsageDescription</key>
<string>使用目的</string>

上記の内容をinfo.plistに追加

Reference