我正在尝试制作一个使用Google Maps的应用程序，并在打开该应用程序时关注用户的位置。
现在，我已经初始化了地图，并且在按下GoogleMaps固有的“ myLocation”按钮后无法将焦点对准用户的位置，但是地图的摄像头仍将焦点对准了指定位置而不是用户位置。
我使用了这两个教程来了解自己现在的位置：-https://developers.google.com/maps/documentation/ios-sdk/start-https://www.raywenderlich.com/197-google-maps-ios-sdk-tutorial-getting-started
搜索Google并在这里之后，似乎我需要利用CLLocationManager（）来获取用户的设备坐标，然后以某种方式使用它？我认为我有关CLLocationManager（）的代码可能放在错误的文件中或使用不正确，但是我没有收到任何错误。
我的代码如下：SceneDelegate.swift将我的LandmarkList.swift设置为rootViewController。然后，LandmarkList调用GoogMapView.swift以显示Google地图实例。
SceneDelegate.swift：
我认为我在这里使用locationManager可能是错误的？
import UIKit
import SwiftUI
import GoogleMaps
import GooglePlaces
import CoreLocation
class SceneDelegate: UIResponder, UIWindowSceneDelegate, CLLocationManagerDelegate {
var window: UIWindow?
private let locationManager = CLLocationManager()
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
// Use a UIHostingController as window root view controller
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: LandmarkList())
self.window = window
window.makeKeyAndVisible()
}
locationManager.requestAlwaysAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
}
}
}
LandmarkList.swift：
import SwiftUI
struct LandmarkList: View {
@State private var searchText = ""
@State private var locationText = ""
var body: some View {
ZStack(alignment: Alignment.top) {
GoogMapView()
.frame(height: 750)
SlideOverCard {
VStack(alignment: .leading) {
List(landmarkData) { landmark in
NavigationLink(destination: LandmarkDetail(landmark: landmark)) {
LandmarkRow(landmark: landmark)
}
}
}
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: Alignment.topLeading)
}
}
}
}
GoogMapView.swift：
注意：下面的打印语句仅返回'用户的位置未知'
import SwiftUI
import UIKit
import GoogleMaps
import GooglePlaces
import CoreLocation
struct GoogMapView : UIViewRepresentable {
let marker : GMSMarker = GMSMarker()
//Creates a `UIView` instance to be presented.
func makeUIView(context: Context) -> GMSMapView {
// Create a GMSCameraPosition
let camera = GMSCameraPosition.camera(withLatitude: 42.361145, longitude: -71.057083, zoom: 16.0)
let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
mapView.setMinZoom(14, maxZoom: 20)
mapView.settings.compassButton = true
mapView.isMyLocationEnabled = true
mapView.settings.myLocationButton = true
mapView.settings.scrollGestures = true
mapView.settings.zoomGestures = true
mapView.settings.rotateGestures = true
mapView.settings.tiltGestures = true
mapView.isIndoorEnabled = false
if let mylocation = mapView.myLocation {
print("User's location: \(mylocation)")
} else {
print("User's location is unknown")
}
return mapView
}
// Updates the presented `UIView` (and coordinator) to the latestconfiguration.
func updateUIView(_ mapView: GMSMapView, context: Context) {
// Creates a marker in the center of the map.
marker.position = CLLocationCoordinate2D(latitude: 42.361145, longitude: -71.057083)
marker.title = "Boston"
marker.snippet = "USA"
marker.map = mapView
}
}
同样，我认为我与SceneDelegate.swift中的locationManager有关的代码将使GoogleMaps相机实例在启动时专注于用户位置，但事实并非如此。
有人知道我在做什么错吗？
您可以通过“假装”您的View是ViewController来实现。尝试将GoogleMapView设置为代表。然后将您的初始化代码放在makeUIView中，然后遵循协议：
struct GoogMapView : CLLocationManagerDelegate {
private let locationManager = CLLocationManager()
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
guard status == .authorizedWhenInUse else {
return
}
locationManager.startUpdatingLocation()
mapView.isMyLocationEnabled = true
mapView.settings.myLocationButton = true
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.first else {
return
}
mapView.camera = GMSCameraPosition(target: location.coordinate, zoom: 15, bearing: 0, viewingAngle: 0)
locationManager.stopUpdatingLocation()
}
}
从https://www.raywenderlich.com/197-google-maps-ios-sdk-tutorial-getting-started上获取。
在这里和其他关于StackOverflow的评论中，我制定了此解决方案：
//
// GoogMapView.swift
// Landmarks
//
// Created by Zahr Lyttle on 10/14/19.
// Copyright © 2019 Apple. All rights reserved.
//
import SwiftUI
import UIKit
import GoogleMaps
import GooglePlaces
import CoreLocation
import Foundation
struct GoogMapView: View {
var body: some View {
GoogMapControllerRepresentable()
}
}
class GoogMapController: UIViewController, CLLocationManagerDelegate {
var locationManager = CLLocationManager()
var mapView: GMSMapView!
let defaultLocation = CLLocation(latitude: 42.361145, longitude: -71.057083)
var zoomLevel: Float = 15.0
let marker : GMSMarker = GMSMarker()
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestAlwaysAuthorization()
locationManager.distanceFilter = 50
locationManager.startUpdatingLocation()
locationManager.delegate = self
let camera = GMSCameraPosition.camera(withLatitude: defaultLocation.coordinate.latitude, longitude: defaultLocation.coordinate.longitude, zoom: zoomLevel)
mapView = GMSMapView.map(withFrame: view.bounds, camera: camera)
mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
mapView.isMyLocationEnabled = true
mapView.setMinZoom(14, maxZoom: 20)
mapView.settings.compassButton = true
mapView.isMyLocationEnabled = true
mapView.settings.myLocationButton = true
mapView.settings.scrollGestures = true
mapView.settings.zoomGestures = true
mapView.settings.rotateGestures = true
mapView.settings.tiltGestures = true
mapView.isIndoorEnabled = false
// if let mylocation = mapView.myLocation {
// print("User's location: \(mylocation)")
// } else {
// print("User's location is unknown")
// }
marker.position = CLLocationCoordinate2D(latitude: 42.361145, longitude: -71.057083)
marker.title = "Boston"
marker.snippet = "USA"
marker.map = mapView
// Add the map to the view, hide it until we've got a location update.
view.addSubview(mapView)
// mapView.isHidden = true
}
// Handle incoming location events.
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location: CLLocation = locations.last!
print("Location: \(location)")
let camera = GMSCameraPosition.camera(withLatitude: location.coordinate.latitude, longitude: location.coordinate.longitude, zoom: zoomLevel)
if mapView.isHidden {
mapView.isHidden = false
mapView.camera = camera
} else {
mapView.animate(to: camera)
}
}
// Handle authorization for the location manager.
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
switch status {
case .restricted:
print("Location access was restricted.")
case .denied:
print("User denied access to location.")
// Display the map using the default location.
mapView.isHidden = false
case .notDetermined:
print("Location status not determined.")
case .authorizedAlways: fallthrough
case .authorizedWhenInUse:
print("Location status is OK.")
}
}
// Handle location manager errors.
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
locationManager.stopUpdatingLocation()
print("Error: \(error)")
}
}
struct GoogMapControllerRepresentable: UIViewControllerRepresentable {
func makeUIViewController(context: UIViewControllerRepresentableContext<GMControllerRepresentable>) -> GMController {
return GMController()
}
func updateUIViewController(_ uiViewController: GMController, context: UIViewControllerRepresentableContext<GMControllerRepresentable>) {
}
}