swift - map View 不以当前用户位置为中心

Question

我正在尝试将 map View 集中在用户位置上，但到目前为止它还没有用。我尝试在我的物理设备上测试它，但没有成功，我找不到有效的解决方案，请帮助我。

class MapViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

var mapView: MKMapView!
var locationManager: CLLocationManager!

let distanceSpan: Double = 500

override func viewDidLoad() {
    super.viewDidLoad()

    setupMapView()
}

fileprivate func setupLocationManager() {self.locationManager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled() == true {

        if CLLocationManager.authorizationStatus() == .restricted || CLLocationManager.authorizationStatus() == .denied || CLLocationManager.authorizationStatus() == .notDetermined {

            locationManager.requestWhenInUseAuthorization()
        }

        locationManager.desiredAccuracy = 1.0
        locationManager.delegate = self
        locationManager.startUpdatingLocation()

    } else {
        print("PLease turn on location services or GPS")
    }

}


func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: locations[0].coordinate.latitude, longitude: locations[0].coordinate.longitude), span: MKCoordinateSpan(latitudeDelta: 0.002, longitudeDelta: 0.002))
    self.mapView.setRegion(region, animated: true)

}

fileprivate func setupMapView() {
    let mView = MKMapView(frame: CGRect(x: 0, y: 20, width: view.frame.width, height: view.frame.height))
    mView.showsUserLocation = true
    view.addSubview(mView)
    self.mapView = mView
}

Answer 1

您需要在新位置更新相机。

阅读here获取更多信息。

基本上，您需要植入函数 CameraUpdate()。