如何“在我打开 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 Google maps sdk。

有谁知道如何“在我打开 ViewController 时在谷歌地图上显示我的当前位置”？

其实它就像谷歌地图应用。当您打开谷歌地图时，蓝点会显示您当前的位置。您不需要第一次按“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()
        } 
    }
}

有人帮忙吗？非常感谢！

Answer 1

Swift 3.x 解决方案，请查看Answer

首先你们必须在 Info.plist 文件中输入一个密钥 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()

}

当您运行代码时，您将弹出允许和不允许定位。只需点击允许，您就会看到您的当前位置。

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)
    }
}

希望对你有帮助

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项 项目 0：谷歌浏览器， 第 1 项：comgooglemaps

• 第二次转到https://developers.google.com/maps/documentation/ios-sdk/start 并按照步骤直到步骤5

• 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)
          }
      }
  
  }
  

（不要忘记在情节提要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，就像您打开 Google 地图应用程序时一样

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），请确保您已获得位置权限并添加此行

mapView.isMyLocationEnabled = true

Answer 5

你可以使用RxCoreLocation:

import UIKit
import GoogleMaps
import RxCoreLocation
import RxSwift

class MapViewController: UIViewController {
    private var mapView: GMSMapView?
    private let disposeBag = DisposeBag()
    private let manager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        manager.requestWhenInUseAuthorization()
        manager.startUpdatingLocation()

        let camera = GMSCameraPosition.camera(withLatitude: 0, longitude: 0, zoom: 17.0)
        mapView = GMSMapView.map(withFrame: .zero, camera: camera)
        view = mapView

        manager.rx
            .didUpdateLocations
            .subscribe(onNext: { [weak self] in
                guard let location = $0.locations.last else { return }
                let camera = GMSCameraPosition.camera(withLatitude: location.coordinate.latitude, longitude: location.coordinate.longitude, zoom: 17.0)
                self?.mapView?.animate(to: camera)
                self?.manager.stopUpdatingLocation()
            })
            .disposed(by: disposeBag)
    }
}

Answer 6

SwiftUI

struct GoogleMapView: UIViewRepresentable {
  @State var coordinator = Coordinator()

  func makeUIView(context _: Context) -> GMSMapView {
    let view = GMSMapView(frame: .zero)
    view.isMyLocationEnabled = true
    view.animate(toZoom: 18)
    view.addObserver(coordinator, forKeyPath: "myLocation", options: .new, context: nil)
  }

  func updateUIView(_ uiView: GMSMapView, context _: UIViewRepresentableContext<GoogleMapView>) {}

  func makeCoordinator() -> GoogleMapView.Coordinator {
    return coordinator
  }

  static func dismantleUIView(_ uiView: GMSMapView, coordinator: GoogleMapView.Coordinator) {
    uiView.removeObserver(coordinator, forKeyPath: "myLocation")
  }

  final class Coordinator: NSObject {
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey: Any]?, context: UnsafeMutableRawPointer?) {
      if let location = change?[.newKey] as? CLLocation, let mapView = object as? GMSMapView {
        mapView.animate(toLocation: location.coordinate)
      }
    }
  }
}

Answer 7

行后：

view = mapView

添加：

mapView.isMyLocationEnabled = true

这将启用您的位置：

注意：- 模拟器上的位置是为特定位置预设的，您无法更改它们。如果要使用当前位置，则必须使用真实设备进行测试。

Answer 8

import UIKit
import GoogleMaps
import GooglePlaces
import CoreLocation

class ViewController: UIViewController,CLLocationManagerDelegate,GMSMapViewDelegate {

    @IBOutlet weak var currentlocationlbl: UILabel!

    var mapView:GMSMapView!

    var locationManager:CLLocationManager! = CLLocationManager.init()
    var geoCoder:GMSGeocoder!
    var marker:GMSMarker!

    var initialcameraposition:GMSCameraPosition!
    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        self.mapView = GMSMapView()
        self.geoCoder = GMSGeocoder()
        self.marker = GMSMarker()
        self.initialcameraposition = GMSCameraPosition()

        // Create gms map view------------->
        mapView.frame = CGRect(x: 0, y: 150, width: 414, height: 667)
        mapView.delegate = self
        mapView.isMyLocationEnabled = true
        mapView.isBuildingsEnabled = false

        mapView.isTrafficEnabled = false
        self.view.addSubview(mapView)
        // create cureent location label---------->

        self.currentlocationlbl.lineBreakMode = NSLineBreakMode.byWordWrapping
        self.currentlocationlbl.numberOfLines = 3
        self.currentlocationlbl.text = "Fetching address.........!!!!!"

        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
        if locationManager.responds(to: #selector(CLLocationManager.requestAlwaysAuthorization))
        {
            self.locationManager.requestAlwaysAuthorization()
        }
        self.locationManager.startUpdatingLocation()

        if #available(iOS 9, *)
        {
            self.locationManager.allowsBackgroundLocationUpdates = true
        }
        else
        {
            //fallback earlier version
        }

        self.locationManager.startUpdatingLocation()
        self.marker.title = "Current Location"
        self.marker.map = self.mapView

        // Gps button add mapview

        let gpbtn:UIButton! = UIButton.init()
        gpbtn.frame = CGRect(x: 374, y: 500, width: 40, height: 40)
        gpbtn.addTarget(self, action: #selector(gpsAction), for: .touchUpInside)
        gpbtn.setImage(UIImage(named:"gps.jpg"), for: .normal)
        self.mapView.addSubview(gpbtn)
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
    {
        var location123 = CLLocation()
        location123 = locations[0]
        let coordinate:CLLocationCoordinate2D! = CLLocationCoordinate2DMake(location123.coordinate.latitude, location123.coordinate.longitude)
        let camera = GMSCameraPosition.camera(withTarget: coordinate, zoom: 16.0)

        self.mapView.camera = camera
        self.initialcameraposition = camera
        self.marker.position = coordinate
        self.locationManager.stopUpdatingLocation()    
    }

    func mapView(_ mapView: GMSMapView, idleAt position: GMSCameraPosition)
    {
        self.currentAddres(position.target)
    }

    func currentAddres(_ coordinate:CLLocationCoordinate2D) -> Void
    {
        geoCoder.reverseGeocodeCoordinate(coordinate) { (response, error) in

            if error == nil
            {
                if response != nil
                {
                    let address:GMSAddress! = response!.firstResult()

                    if address != nil
                    {
                        let addressArray:NSArray! = address.lines! as NSArray

                        if addressArray.count > 1
                        {
                            var convertAddress:AnyObject! = addressArray.object(at: 0) as AnyObject!
                            let space = ","
                            let convertAddress1:AnyObject! = addressArray.object(at: 1) as AnyObject!
                            let country:AnyObject! = address.country as AnyObject!

                            convertAddress = (((convertAddress.appending(space) + (convertAddress1 as! String)) + space) + (country as! String)) as AnyObject

                            self.currentlocationlbl.text = "\(convertAddress!)".appending(".")
                        }
                        else
                        {
                            self.currentlocationlbl.text = "Fetching current location failure!!!!"
                        }
                    }
                }
            }
        }
    }