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，我想用地图（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密钥才能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()

    // 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

对于Swift 2，您应该将其更改为以下内容：

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    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)
}

Answer 6

你必须覆盖CLLocationManager.didUpdateLocations

 func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    let userLocation:CLLocation = locations[0] as CLLocation
    locationManager.stopUpdatingLocation()

    let location = CLLocationCoordinate2D(latitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude)

    let span = MKCoordinateSpanMake(0.5, 0.5)

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

    mapView.setRegion(region, animated: true)
}

你还必须将NSLocationWhenInUseUsageDescription和NSLocationAlwaysUsageDescription添加到你的plist设置Result作为值

Answer 7

在Swift 4中，我使用了如上定义的locationManager委托函数。

func locationManager(manager: CLLocationManager!, 
    didUpdateLocations locations: [AnyObject]!) {

..但这需要改为......

func locationManager(_ manager: CLLocationManager,
    didUpdateLocations locations: [CLLocation]) {

这来自.. https://github.com/lotfyahmed/MyLocation/blob/master/MyLocation/ViewController.swift - 谢谢！