只显示一个位置的权限警报
问题描述:
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
}
答
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>
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