XCode 11:后台监控不起作用

Question

经过几个小时的阅读和重新编码，我仍然找不到解决方案。

我想建立一个简单的应用程序，跟踪我的位置在后台。在第一次加载应用程序时，我在当前位置周围设置了一个区域，开始监控这个区域和stopUpdatingLocations。一旦应用程序获得didExitRegion事件，我再次获得当前位置，设置另一个区域(在清理所有其他受监控区域之后)，然后所有操作再次启动。

这个应用有定位的alwaysAuthorization，设置了位置更新的后台模式，PList包含LocationAlwaysAndWhenInUseUsageDescription和LocationWhenInUseUsageDescription。

有一段时间，它工作得很好。但在长时间不移动之后，应用程序被挂起，不再接收任何位置更新，甚至不会收到监视器事件，这应该会在我正确理解this ()时重新启动应用程序。

有谁能给我点提示吗？

谢谢。

import UIKit
import CoreLocation
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

let locationManager = CLLocationManager()

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {


    let currentNotifications = UNUserNotificationCenter.current()


    currentNotifications.getNotificationSettings { (settings) in
        if settings.authorizationStatus == .notDetermined {
            UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound]) { (granted, error) in }
        }
    }


    locationManager.delegate = self
    locationManager.requestAlwaysAuthorization()
    locationManager.allowsBackgroundLocationUpdates = true
    locationManager.startUpdatingLocation()


    return true
}

}

extension AppDelegate: CLLocationManagerDelegate {


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


    let location = locations[0]


    let now = Date()
    let formatter = DateFormatter()


    formatter.timeZone = TimeZone.current
    formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"


    for region in locationManager.monitoredRegions {
        locationManager.stopMonitoring(for: region)
    }


    var regionIdentifier = String(format: "%f", location.coordinate.latitude) + ", " + String(format: "%f", location.coordinate.latitude) + "( set on " + formatter.string(from: now) + ")"


    var geofenceRegion = CLCircularRegion(center: CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude), radius: 250, identifier: regionIdentifier)


    geofenceRegion.notifyOnExit = true
    locationManager.startMonitoring(for: geofenceRegion)


    locationManager.stopUpdatingLocation()


}




func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
    locationManager.stopMonitoring(for: region)
    sendNotification(title: "Event triggered", subtitle: "Region exit", body: region.identifier)
    locationManager.startUpdatingLocation()
}


}

public func sendNotification(title: String, subtitle: String, body: String) {


let content = UNMutableNotificationContent()
content.title = title
content.subtitle = subtitle
content.body = body
content.sound = .default


let identifier = "geoStalker4_notification_" + String(format: "%f", NSDate().timeIntervalSince1970)


let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 3, repeats: false)


let request = UNNotificationRequest(identifier: identifier, content: content, trigger: nil)


UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)


}

Answer 1

尝试将此内容添加到您的locationManager设置：

locationManager.pausesLocationUpdatesAutomatically = false