在 apple mapkit 上缩放 swift

Question

我已经能够在我的应用程序中实现 MapKit，但它目前在一个静态位置查看地图。

我一直在努力添加捏和缩放功能以及允许用户探索地图上其他区域的能力。

这是我当前的代码：

import UIKit
import MapKit
import CoreLocation

class HotPlacesViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

@IBOutlet weak var mapView: MKMapView!

var locationManager = CLLocationManager()
let newPin = MKPointAnnotation()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    // Setup the location services delegate in this class.
    locationManager.delegate = self

    // This little method requests the users permission for location services whilst in this view controller.
    if CLLocationManager.authorizationStatus() == .notDetermined {
        self.locationManager.requestAlwaysAuthorization()
    let alert = UIAlertController(title: "You can change this option in the Settings App", message: "So keep calm your selection is not permanent. ",
                                  preferredStyle: .alert)

        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))

        self.present(alert, animated: true, completion: nil)
    }

    locationManager.distanceFilter = kCLDistanceFilterNone
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.startUpdatingLocation()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

}

// Drops the pin on the users current location.
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    mapView.removeAnnotation(newPin)

    let location = locations.last! as CLLocation
    let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
    let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))

    // Set the region on the map.
    mapView.setRegion(region, animated: true)

    newPin.coordinate = location.coordinate
    mapView.addAnnotation(newPin)

}

}

Answer 1

let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
mapView.setRegion(region, animated: true)

设置放大范围MapKit

Answer 2

我认为你的问题与此方法有关 func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])，因为当位置更新时你一遍又一遍地调整地图中的区域，这就是为什么你只看到位置所在的区域已更新且无法移动地图中的任何其他区域，您必须第一次制作标志并只调整一次区域或根本不调整区域

已编辑

    import UIKit
    import MapKit
    import CoreLocation

    class HotPlacesViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

    @IBOutlet weak var mapView: MKMapView!
    var isFirstTime = true

    var locationManager = CLLocationManager()
    let newPin = MKPointAnnotation()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        // Setup the location services delegate in this class.
        locationManager.delegate = self

        // This little method requests the users permission for location services whilst in this view controller.
        if CLLocationManager.authorizationStatus() == .notDetermined {
            self.locationManager.requestAlwaysAuthorization()
        let alert = UIAlertController(title: "You can change this option in the Settings App", message: "So keep calm your selection is not permanent. ",
                                      preferredStyle: .alert)

            alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))

            self.present(alert, animated: true, completion: nil)
        }

        locationManager.distanceFilter = kCLDistanceFilterNone
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.startUpdatingLocation()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

    }

    // Drops the pin on the users current location.
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        mapView.removeAnnotation(newPin)

        let location = locations.last! as CLLocation
        let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
        if(self.isFirstTime){
        let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))

        // Set the region on the map.
        mapView.setRegion(region, animated: true)
        self.isFirstTime = false
        }

        newPin.coordinate = location.coordinate
        mapView.addAnnotation(newPin)

    }
}

希望这对您有所帮助，如果我误解了您的问题请告诉我

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