Ios 仅显示一个位置权限警报

我希望我的应用程序在活动和后台模式下进行定位（如果仅使用NSLocationAlwaysUsageDescription权限，则myLocationButton不显示）。 我在Info.plist中设置：

<key>NSLocationAlwaysUsageDescription</key>
<string>$(PRODUCT_NAME) location use</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>$(PRODUCT_NAME) location use</string>
<key>UIBackgroundModes</key>

但当应用程序启动时，仅显示第一个位置权限警报，而第二个权限警报在应用程序重新打开后显示

更新：

override func viewDidLoad() {
        super.viewDidLoad()
 ...    
 locationManager.delegate = self
 locationManager.requestWhenInUseAuthorization()
 viewMap.addObserver(self, forKeyPath: "myLocation", options: NSKeyValueObservingOptions.new, context: nil)
        self.startLocationUpdates()
 ...
}

func startLocationUpdates() {
    self.locationManager.delegate = self
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    self.locationManager.activityType = CLActivityType.automotiveNavigation
    self.locationManager.distanceFilter = distanceFilterMetr
    self.locationManager.requestAlwaysAuthorization()
    self.locationManager.startUpdatingLocation()
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {

        let myLocation: CLLocation = change?[NSKeyValueChangeKey.newKey] as! CLLocation
        viewMap.camera = GMSCameraPosition.camera(withTarget: myLocation.coordinate, zoom: observeZoom)
        mapRoute.coordinateLatitude = myLocation.coordinate.latitude
        mapRoute.coordinateLongitude = myLocation.coordinate.longitude
        viewMap.delegate = self
        viewMap.settings.myLocationButton = true
        viewMap.settings.compassButton = true
        didFindMyLocation = true
}

---

在类中添加此委托：

CLLocationManagerDelegate

现在在你们班里：

var locationManager:CLLocationManager!
var map = GMSMapView()
var currentLatitude:Double!
var currentLongitude:Double!

之后，在代码中添加以下内容：

override func loadView() {

    print("loadView called")

    // Enable some map settings

    map.isMyLocationEnabled = true
    map.settings.myLocationButton = true
    map.settings.compassButton = true
    map.settings.scrollGestures = true
    map.settings.zoomGestures = true
    map.delegate = self

    view = map
}

override func viewDidLoad() {

    super.viewDidLoad()

    print("ViewDidLoad called")

    // Configuring location manager.

    locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.requestAlwaysAuthorization()
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.startUpdatingLocation()
    locationManager.startMonitoringSignificantLocationChanges()
}

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

    print("locationManager function called")

    // Fetch current location coordinates

    let locValue:CLLocationCoordinate2D = (locationManager.location?.coordinate)!
    currentLatitude = locValue.latitude
    currentLongitude = locValue.longitude
    print("Current Location = \(currentLatitude!), \(currentLongitude!)")

    // Zoom to current location

    let target = CLLocationCoordinate2D(latitude: currentLatitude!, longitude: currentLongitude!)
    map.camera = GMSCameraPosition.camera(withTarget: target, zoom: 17)

    locationManager.stopUpdatingLocation()

}

添加此代码后，右键单击Info.plist并“作为源代码打开”。将此添加到您的Info.plist中

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>googlechromes</string>
    <string>comgooglemaps</string>
</array>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>NSBluetoothPeripheralUsageDescription</key>
<string></string>
<key>NSCameraUsageDescription</key>
<string></string>
<key>NSContactsUsageDescription</key>
<string></string>
<key>NSLocationUsageDescription</key>
<string></string>
<key>NSLocationWhenInUseUsageDescription</key>
<string></string>
<key>NSLocationAlwaysUsageDescription</key>
<string></string>
<key>NSMicrophoneUsageDescription</key>
<string></string>
<key>NSMotionUsageDescription</key>
<string></string>
<key>NSPhotoLibraryUsageDescription</key>
<string></string>
<key>NSRemindersUsageDescription</key>
<string></string>
<key>NSSiriUsageDescription</key>
<string></string>
<key>NSSpeechRecognitionUsageDescription</key>
<string></string>
<key>NSVideoSubscriberAccountUsageDescription</key>
<string></string>

LSApplicationQueriesSchemes
谷歌色度
谷歌地图
LSREQUIRESPHONEOS
NSBluetooth外围设备用途说明
NSCameraUsageDescription
NSContactsUsageDescription
NSLocationUsageDescription
NSLocationWhenUse用途说明
N位置始终使用说明
NSM话筒用途说明
NSMotionUsageDescription
NSPhotoLibraryUsageDescription
NSRemindersUsageDescription
NSSIRIUSAGESCRIPTION
NSSpeechRecognitionUsageDescription
NSVideoSubscriberAccountUsageDescription

您只需申请“始终”授权即可。这使您的应用程序有权在前台和后台使用位置。@Paulw11我写的是，如果仅使用NSLocationAlwaysSusageDescription权限，则myLocationButton不显示（位置更新但按钮不显示）iOS 10.3 swift 3您如何决定是否显示该按钮？我可以向您保证，前台和后台位置始终只需要身份验证。@Paulw11请更新我的代码。谢谢请注意，在本教程中，他们实现了

didChangeAuthorizationStatus

delegate方法，并使用该方法启用mylocation按钮。您是否实施了该方法并更改了您请求的“始终”授权？

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>googlechromes</string>
    <string>comgooglemaps</string>
</array>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>NSBluetoothPeripheralUsageDescription</key>
<string></string>
<key>NSCameraUsageDescription</key>
<string></string>
<key>NSContactsUsageDescription</key>
<string></string>
<key>NSLocationUsageDescription</key>
<string></string>
<key>NSLocationWhenInUseUsageDescription</key>
<string></string>
<key>NSLocationAlwaysUsageDescription</key>
<string></string>
<key>NSMicrophoneUsageDescription</key>
<string></string>
<key>NSMotionUsageDescription</key>
<string></string>
<key>NSPhotoLibraryUsageDescription</key>
<string></string>
<key>NSRemindersUsageDescription</key>
<string></string>
<key>NSSiriUsageDescription</key>
<string></string>
<key>NSSpeechRecognitionUsageDescription</key>
<string></string>
<key>NSVideoSubscriberAccountUsageDescription</key>
<string></string>