只显示一个位置的权限警报

我想我的应用程序采取积极和背景模式的位置（如果仅使用NSLocationAlwaysUsageDescription的许可，则myLocationButton不显示）。我在Info.plist中设置：只显示一个位置的权限警报

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

而添加的MapViewController

self.locationManager.requestWhenInUseAuthorization() 
self.locationManager.requestAlwaysAuthorization()

但是，应用程序启动时，只显示第一位置的权限警报时，并且应用程序后出现的第二个警报的权限重新开放。

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 
}

来源

2017-04-11 Roman

您只需要请求“始终”授权。这使您的应用有权在前台和后台使用位置信息。 – Paulw11

@ Paulw11我写了如果只使用NSLocationAlwaysUsageDescription权限，然后myLocationButton不显示（位置更新但按钮不显示）iOS 10.3 swift 3 – Roman

你如何决定是否显示该按钮？我可以向你保证，总是身份验证是前台和后台位置所需要的。 – Paulw11

添加此委托在你的类：

CLLocationManagerDelegate

你类中

现在：

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

之后在代码中添加此：

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，右键单击您的Info.plist并选择“作为源代码打开”。将其添加到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>

来源

2017-04-11 10:34:06

只显示一个位置的权限警报

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