如何"当我打开ViewController时,在谷歌地图上显示我的当前位置？" 在斯威夫特？

Question

我正在使用iOS(Swift)的谷歌地图sdk.

有谁知道如何"当我打开ViewController时,在谷歌地图上显示我的当前位置"？

实际上它就像谷歌地图应用程序.当您打开Goog​​le地图时,蓝点将显示您当前的位置.您不需要在第一次按"myLocationButton".

所以这是代码:

import UIKit
import CoreLocation
import GoogleMaps

class GoogleMapsViewer: UIViewController {

    @IBOutlet weak var mapView: GMSMapView!

    let locationManager = CLLocationManager()
    let didFindMyLocation = false

    override func viewDidLoad() {
        super.viewDidLoad()

        let camera = GMSCameraPosition.cameraWithLatitude(23.931735,longitude: 121.082711, zoom: 7)
        let mapView = GMSMapView.mapWithFrame(CGRectZero, camera: camera)

        mapView.myLocationEnabled = true
        self.view = mapView

        // GOOGLE MAPS SDK: BORDER
        let mapInsets = UIEdgeInsets(top: 80.0, left: 0.0, bottom: 45.0, right: 0.0)
        mapView.padding = mapInsets

        locationManager.distanceFilter = 100
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()

        // GOOGLE MAPS SDK: COMPASS
        mapView.settings.compassButton = true

        // GOOGLE MAPS SDK: USER'S LOCATION
        mapView.myLocationEnabled = true
        mapView.settings.myLocationButton = true
    }
}


// MARK: - CLLocationManagerDelegate
extension GoogleMapsViewer: CLLocationManagerDelegate {

    func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        if status == .AuthorizedWhenInUse {
            locationManager.startUpdatingLocation()
            mapView.myLocationEnabled = true
            mapView.settings.myLocationButton = true
        }
    }
        func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let location = locations.first {
            mapView.camera = GMSCameraPosition(target: location.coordinate, zoom: 20, bearing: 0, viewingAngle: 0)
            locationManager.stopUpdatingLocation()
        } 
    }
}

有人帮吗？非常感谢!

Answer 1

对于Swift 3.x解决方案,请查看此答案

首先,所有人都必须在Info.plist文件中输入密钥 NSLocationWhenInUseUsageDescription

添加此密钥后,只需创建一个CLLocationManager变量并执行以下操作

@IBOutlet weak var mapView: GMSMapView!
var locationManager = CLLocationManager()

class YourControllerClass: UIViewController,CLLocationManagerDelegate {

    //Your map initiation code 
    let mapView = GMSMapView.mapWithFrame(CGRectZero, camera: camera)
    self.view = mapView
    self.mapView?.myLocationEnabled = true

    //Location Manager code to fetch current location
    self.locationManager.delegate = self
    self.locationManager.startUpdatingLocation()
}


//Location Manager delegates
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    let location = locations.last

    let camera = GMSCameraPosition.cameraWithLatitude((location?.coordinate.latitude)!, longitude: (location?.coordinate.longitude)!, zoom: 17.0)

    self.mapView?.animateToCameraPosition(camera)

    //Finally stop updating location otherwise it will come again and again in this delegate
    self.locationManager.stopUpdatingLocation()

}

运行代码时,弹出"允许"和"不允许位置".只需点击"允许",您就会看到当前位置.

确保在设备而不是模拟器上执行此操作.如果您使用的是模拟器,则必须选择一些自定义位置,然后才能看到蓝点.

Answer 2

使用此代码,

你错过了addObserver方法和一些内容,

viewDidLoad:

mapView.settings.compassButton = YES;

mapView.settings.myLocationButton = YES;

mapView.addObserver(self, forKeyPath: "myLocation", options: .New, context: nil)

dispatch_async(dispatch_get_main_queue(), ^{
    mapView.myLocationEnabled = YES;
  });

观察者方法:

override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) {

    if change[NSKeyValueChangeOldKey] == nil {

        let location = change[NSKeyValueChangeNewKey] as CLLocation
        gmsMap.camera = GMSCameraPosition.cameraWithTarget(location.coordinate, zoom: 16)
    }
}

希望它有所帮助

Answer 3

• 首先将以下内容添加到您的 info.plist

  1. NSLocationWhenInUseUsageDescription
  2. LSApplicationQueriesSchemes（数组类型，并在此数组中添加两个项目项目 0 ： googlechromes ，项目 1 ： comgooglemaps

• 第二个去https://developers.google.com/maps/documentation/ios-sdk/start并按照步骤直到第 5 步

• 设置完所有内容后要做的最后一件事是转到您的 ViewController 并粘贴以下内容

  import UIKit
  import GoogleMaps
  
  class ViewController: UIViewController,CLLocationManagerDelegate {
  
      //Outlets
      @IBOutlet var MapView: GMSMapView!
  
      //Variables
      var locationManager = CLLocationManager()
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          initializeTheLocationManager()
          self.MapView.isMyLocationEnabled = true
      }
  
      func initializeTheLocationManager() {
          locationManager.delegate = self
          locationManager.requestWhenInUseAuthorization()
          locationManager.startUpdatingLocation()
      }
  
      func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
  
          var location = locationManager.location?.coordinate
  
          cameraMoveToLocation(toLocation: location)
  
      }
  
      func cameraMoveToLocation(toLocation: CLLocationCoordinate2D?) {
          if toLocation != nil {
              MapView.camera = GMSCameraPosition.camera(withTarget: toLocation!, zoom: 15)
          }
      }
  
  }
  

（不要忘记在故事板中添加一个视图并将其连接到 MapViw）

现在您可以构建并运行以在 google 地图上查看您当前的位置，就像打开 Google Map App 时一样

享受编码:)

Answer 4

Swift 3.0 或更高版本

要在 GMS 地图视图中显示用户位置（蓝色标记），请确保您拥有位置权限并添加此行

mapView.isMyLocationEnabled = true