应用终止时获取用户的位置 [英] Getting the user's location when app is terminated

问题描述

我目前正在开发一个应用，但遇到了一个问题.我的应用程序的目的是查看某人何时下班.为此，应用程序应该能够 100% 地在应用程序打开、后台或终止(终止)时获取用户的位置.我的理解是，您必须为此使用重要的位置更改功能.但是，它没有按预期工作.

I'm currently working on an app and am encountering a problem. The purpose of my app is to see when someone leaves work. For that to work 100% of the time the app should be able to get the user's location while the app is open, in the background or terminated (killed). My understanding is that you have to use the significant location change functionality for this. However, it's not working as expected.

应用程序委托:

    //handle location changes when app is terminated and waken up by the OS
    if launchOptions?[UIApplicationLaunchOptionsKey.location] != nil {
        print("Restarted app due to a location update")
        request = Locator.subscribeSignificantLocations(onUpdate: { newLoc in
            let db: FirebaseDB = FirebaseDB.shared
            db.postCoordinates(coordinates: CLLocation(latitude: 9.99, longitude: 9.99))
            print("new loc found -> \(newLoc)")
        }, onFail: {(err, lastLoc) in
            print("failed to get loc, -> \(err)")
        })
        //send new post to DB
    }

    //subscribeSignificantLocations -> power efficient
        request = Locator.subscribeSignificantLocations(onUpdate: { newLoc in
            print("new loc found -> \(newLoc)")
        }, onFail: {(err, lastLoc) in
            print("failed to get new loc, -> \(err)")
        })

除了在应用终止时获取位置外，一切正常...

Everything works except for getting the location when the app is terminated...

提前致谢！

推荐答案

经过数小时的搜索和阅读解决方案后，我找到了一个适合我的解决方案.(注意:我正在研究地理围栏，我需要在用户离开特定区域时通知/调用 API)

After hours of searching and reading for the solution, I found a working solution for me. (NOTE: I am working on geofencing where I need to notify/call API the user when he leaves certain area)

第一步也是最重要的一步是获得用户对位置访问权限的始终"授权.

The first and most important step is to have "always" authorization by the user for location access.

其次，即使在应用终止后，我们也需要使用 startMonitoringSignificantLocationChanges() 进行位置更新.

Second, we need to use startMonitoringSignificantLocationChanges() for location update even after the app termination.

        locationManager.requestAlwaysAuthorization()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
        locationManager.allowsBackgroundLocationUpdates = true
        locationManager.startUpdatingLocation()
        locationManager.startMonitoringSignificantLocationChanges() //THIS IS WHERE THE MAGIC HAPPENS

以下是获取位置更新本地通知的代码.

Below is the code for getting the local notifications for location update.

import UIKit


@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, CLLocationManagerDelegate {

    var window: UIWindow?
    let locationManager = CLLocationManager()

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.


        locationManager.requestAlwaysAuthorization()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
        locationManager.allowsBackgroundLocationUpdates = true
        locationManager.startUpdatingLocation()
        locationManager.startMonitoringSignificantLocationChanges()

        application.registerUserNotificationSettings(UIUserNotificationSettings(types: [.sound, .alert, .badge], categories: nil))
        UIApplication.shared.cancelAllLocalNotifications()

        return true
    }

    func alertUserOnLeaving(region:CLRegion){
        if UIApplication.shared.applicationState == .active {
            let alert = UIAlertController(title: "Alert Title", message: "Alert Message", style = .Alert
            window?.rootViewController?.present(alert, animated: true, completion: nil)
        }
        else{
            let notification = UILocalNotification()
            notification.alertBody = "You forgot to checkout"
            notification.soundName = "Default"
            UIApplication.shared.presentLocalNotificationNow(notification)
        }
    }

    func alertUserOnArrival(region:CLRegion){
        if UIApplication.shared.applicationState == .active {
            let alert = UIAlertController(title: "Alert Title", message: "Alert Message", style = .Alert
            window?.rootViewController?.present(alert, animated: true, completion: nil)
        }
        else{
            let notification = UILocalNotification()
            notification.alertBody = "Welcome Please checkin"
            notification.soundName = "Default"
            UIApplication.shared.presentLocalNotificationNow(notification)
        }
    }

    func setUpGeofenceForJob() {
        let geofenceRegionCenter = CLLocationCoordinate2DMake(-33.7513580322265, 151.242416381836)
        let geofenceRegion = CLCircularRegion(center: geofenceRegionCenter, radius: 100, identifier: "GeoFence")
        geofenceRegion.notifyOnExit = true
        geofenceRegion.notifyOnEntry = true
        self.locationManager.startMonitoring(for: geofenceRegion)
    }

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if (status == CLAuthorizationStatus.authorizedAlways) {
            self.setUpGeofenceForJob()
        }
    }

    func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
        alertUserOnArrival(region: region)
    }
    func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
        alertUserOnLeaving(region: region)
    }

希望有帮助.

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