Question

当应用权限更改时，是否有人知道系统是否可以在后台通知应用？我特别感兴趣的是在用户更改“位置”权限和“后台应用刷新”权限时收到通知。

到目前为止，我已经研究了这种回叫方法：

locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus)

但是，应用程序不会在后台得到通知。

我还尝试为此通知添加观察者：

UIApplicationBackgroundRefreshStatusDidChangeNotification

但我也无法让它发挥作用。

这是我的代码：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {        
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "checkBackgroundPermission", name: UIApplicationBackgroundRefreshStatusDidChangeNotification, object: nil)

    locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.pausesLocationUpdatesAutomatically = false

    if(locationManager.respondsToSelector("requestAlwaysAuthorization")) {
        locationManager.requestAlwaysAuthorization()
    }

    if launchOptions?[UIApplicationLaunchOptionsLocationKey] != nil {
        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.pausesLocationUpdatesAutomatically = false

        let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
        let uuidString = prefs.stringForKey("UUID") as String!
        let uuid : NSUUID? = NSUUID(UUIDString: uuidString as String)

        beaconRegionGeneral = CLBeaconRegion(proximityUUID: NSUUID(UUIDString: uuidString), identifier: "general")

        locationManager.startRangingBeaconsInRegion(beaconRegionGeneral)
        setIsRanging(true)
    }


    if(application.respondsToSelector("registerUserNotificationSettings:")) {
        application.registerUserNotificationSettings(
            UIUserNotificationSettings(
                forTypes: UIUserNotificationType.Alert | UIUserNotificationType.Sound,
                categories: nil
            )
        )
    }

    return true
}

func checkBackgroundPermission() {
    sendLocalNotificationWithMessage("checkBackgroundPermission", playSound: false)
    println("checkBackgroundPermission")
}

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    sendLocalNotificationWithMessage("didChangeAuthorizationStatus", playSound: true)
    println("didChangeAuthorizationStatus")
}

Answer 1

您可以使用以下委托方法（来自CLLocationManagerDelegate协议）来获取通知。

 optional func locationManager(_ manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus)

当应用的“位置”和“后台应用刷新”权限发生变化时，会在后台收到通知

1 个答案: