在Swift中的MKMapView中显示当前位置和更新位置

Question

我正在学习如何使用新的Swift语言(只有Swift,没有Objective-C).要做到这一点,我想用map(MKMapView)做一个简单的视图.我想查找并更新用户的位置(例如在Apple Map应用程序中).

我试过了,但没有发生任何事:

import MapKit
import CoreLocation

class MapView : UIViewController, CLLocationManagerDelegate {

    @IBOutlet weak var map: MKMapView!
    var locationManager: CLLocationManager!

    override func viewDidLoad() {
        super.viewDidLoad()

        if (CLLocationManager.locationServicesEnabled())
        {
            locationManager = CLLocationManager()
            locationManager.delegate = self
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.requestAlwaysAuthorization()
            locationManager.startUpdatingLocation()
        }
    }
}

请你帮助我好吗？

Answer 1

您必须覆盖CLLocationManager.didUpdateLocations(CLLocationManagerDelegate的一部分)以在位置管理器检索当前位置时收到通知:

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if let location = locations.last{
        let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
        let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
        self.map.setRegion(region, animated: true)
    }
}

注意:如果您的目标是iOS 8或更高版本,则必须在Info.plist中包含NSLocationAlwaysUsageDescription或NSLocationWhenInUseUsageDescription键以使位置服务正常工作.

Answer 2

100%工作,简单的步骤和测试

导入库:

import MapKit
import CoreLocation

设置代表:

CLLocationManagerDelegate,MKMapViewDelegate

变量:

let locationManager = CLLocationManager()

在viewDidLoad()上编写此代码:

self.locationManager.requestAlwaysAuthorization()

self.locationManager.requestAlwaysAuthorization()

    // For use in foreground
    self.locationManager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.startUpdatingLocation()
    }

    mapView.delegate = self
    mapView.mapType = .standard
    mapView.isZoomEnabled = true
    mapView.isScrollEnabled = true

    if let coor = mapView.userLocation.location?.coordinate{
        mapView.setCenter(coor, animated: true)
    }

写位置的委托方法:

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let locValue:CLLocationCoordinate2D = manager.location!.coordinate

    mapView.mapType = MKMapType.standard

    let span = MKCoordinateSpanMake(0.05, 0.05)
    let region = MKCoordinateRegion(center: locValue, span: span)
    mapView.setRegion(region, animated: true)

    let annotation = MKPointAnnotation()
    annotation.coordinate = locValue
    annotation.title = "Javed Multani"
    annotation.subtitle = "current location"
    mapView.addAnnotation(annotation)

    //centerMap(locValue)
}

不要忘记在info.plist中设置权限

<key>NSLocationWhenInUseUsageDescription</key>
<string>This application requires location services to work</string>

<key>NSLocationAlwaysUsageDescription</key>
<string>This application requires location services to work</string>

它看起来像:

Answer 3

对于swift 3和XCode 8,我找到了这个答案:

• 首先,您需要将隐私设置为info.plist.插入字符串NSLocationWhenInUseUsageDescription以及您想要获取用户位置的描述.例如,设置字符串"For application in application".

• 其次,使用此代码示例

  @IBOutlet weak var mapView: MKMapView!
  
  private var locationManager: CLLocationManager!
  private var currentLocation: CLLocation?
  
  override func viewDidLoad() {
      super.viewDidLoad()
  
      mapView.delegate = self
  
      locationManager = CLLocationManager()
      locationManager.delegate = self
      locationManager.desiredAccuracy = kCLLocationAccuracyBest
  
      // Check for Location Services
  
      if CLLocationManager.locationServicesEnabled() {
          locationManager.requestWhenInUseAuthorization()
          locationManager.startUpdatingLocation()
      }
  }
  
  // MARK - CLLocationManagerDelegate
  
  func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
      defer { currentLocation = locations.last }
  
      if currentLocation == nil {
          // Zoom to user location
          if let userLocation = locations.last {
              let viewRegion = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 2000, 2000)
              mapView.setRegion(viewRegion, animated: false)
          }
      }
  }
  

• 第三,在storyView的storyboard中设置User Location标志.

Answer 4

MyLocation 是一个Swift iOS演示.

您可以将此演示用于以下内容:

1. 显示当前位置.

2. 选择其他位置:在这种情况下,请停止跟踪位置.

3. 触摸时将推针添加到MKMapView(iOS).

Answer 5

您好有时在代码中设置showsUserLocation 会因为一些奇怪的原因而不起作用。

因此，请尝试以下组合。

在 viewDidLoad()

  self.mapView.showsUserLocation = true

在 Xcode 中转到您的故事板，在右侧面板的属性检查器上勾选用户位置复选框，如附加图像中所示。运行您的应用程序，您应该能够看到用户位置

Answer 6

斯威夫特 5.1

获取当前位置并在 MKMapView 上设置

导入库：

import MapKit
import CoreLocation

设置代表：

CLLocationManagerDelegate , MKMapViewDelegate

声明变量：

let locationManager = CLLocationManager()

在 viewDidLoad() 上写下这段代码：

self.locationManager.requestAlwaysAuthorization()
self.locationManager.requestWhenInUseAuthorization()

if CLLocationManager.locationServicesEnabled() {
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.startUpdatingLocation()
}
mapView.delegate = self
mapView.mapType = .standard
mapView.isZoomEnabled = true
mapView.isScrollEnabled = true

if let coor = mapView.userLocation.location?.coordinate{
    mapView.setCenter(coor, animated: true)
}

编写位置委托方法：

func locationManager(_ manager: CLLocationManager, didUpdateLocations 
    locations: [CLLocation]) {
    let locValue:CLLocationCoordinate2D = manager.location!.coordinate

    mapView.mapType = MKMapType.standard

    let span = MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05)
    let region = MKCoordinateRegion(center: locValue, span: span)
    mapView.setRegion(region, animated: true)

    let annotation = MKPointAnnotation()
    annotation.coordinate = locValue
    annotation.title = "You are Here"
    mapView.addAnnotation(annotation)
}

在info.plist中设置权限*

<key>NSLocationWhenInUseUsageDescription</key>
<string>This application requires location services to work</string>

<key>NSLocationAlwaysUsageDescription</key>
<string>This application requires location services to work</string>