更新后台位置每n分钟永远在Swift 2.0中

Question

通过AppDelegate.swift中的代码，我可以每隔30秒获取一次位置更新。但是，180秒后后台执行由backgroundTimeRemaining启动。
plist中有UIBackgroundModes
“位置”的标签我有两个问题：

1. 为什么backgroundTimeRemaining未重置？
2. 如果我执行startUpdatingLocation（），然后stopUpdatingLocation（）来节省电池电量，那么我将不会再获取位置更新。

import UIKit 
import CoreLocation 
@UIApplicationMain 
class AppDelegate: UIResponder, UIApplicationDelegate, CLLocationManagerDelegate { 

    var window: UIWindow? 
    let locationManager = CLLocationManager() 
    var pos = 0 
    var LatitudeGPS = NSString() 
    var LongitudeGPS = NSString() 
    var speedGPS = NSString() 
    var Course = NSString() 
    var Altitude = NSString() 
    var bgtimer = NSTimer() 

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 
     // Override point for customization after application launch. 
     return true 
    } 

    var backgroundUpdateTask: UIBackgroundTaskIdentifier! 

    func beginBackgroundUpdateTask() { 
     self.backgroundUpdateTask = UIApplication.sharedApplication().beginBackgroundTaskWithExpirationHandler({ 
     self.endBackgroundUpdateTask() 
     }) 
    } 

    func endBackgroundUpdateTask() { 
     UIApplication.sharedApplication().endBackgroundTask(self.backgroundUpdateTask) 
     self.backgroundUpdateTask = UIBackgroundTaskInvalid 
    } 

    func doBackgroundTask() { 

     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { 
      self.beginBackgroundUpdateTask() 

      // Do something 
      self.StartupdateLocation() 

      self.bgtimer = NSTimer.scheduledTimerWithTimeInterval(30, target: self, selector: "bgtimer:", userInfo: nil, repeats: true) 
      NSRunLoop.currentRunLoop().addTimer(self.bgtimer, forMode: NSDefaultRunLoopMode) 
      NSRunLoop.currentRunLoop().run() 

      // End the background task. 
      self.endBackgroundUpdateTask() 
     }) 
    } 

    func bgtimer(timer:NSTimer!){ 

     print("Fired from Background ************************************") 

     updateLocation() 

     print("Position Report: \(pos)") 
    } 

    func applicationDidEnterBackground(application: UIApplication) { 

     self.doBackgroundTask() 
    } 

    func StartupdateLocation() { 
     locationManager.delegate = self 
     locationManager.startUpdatingLocation() 
     locationManager.desiredAccuracy = kCLLocationAccuracyBest 
     locationManager.distanceFilter = kCLDistanceFilterNone 
     locationManager.requestWhenInUseAuthorization() 
     locationManager.allowsBackgroundLocationUpdates = true 
     locationManager.pausesLocationUpdatesAutomatically = false 
    } 

    func updateLocation() { 
     pos++ 

     //locationManager.startUpdatingLocation() 
     //locationManager.stopUpdatingLocation() 

     print("Latitude: \(LatitudeGPS)") 
     print("Longitude: \(LongitudeGPS)") 
     print("Speed: \(speedGPS)") 
     print("Heading: \(Course)") 
     print("Altitude BG: \(Altitude)") 
     print(UIApplication.sharedApplication().backgroundTimeRemaining) 
    } 

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

     LatitudeGPS = String(format: "%.10f", manager.location!.coordinate.latitude) 
     LongitudeGPS = String(format: "%.10f", manager.location!.coordinate.longitude) 
     speedGPS = String(format: "%.3f", manager.location!.speed) 
     Altitude = String(format: "%.3f", manager.location!.altitude) 
     Course = String(format: "%.3f", manager.location!.course) 
    } 
} 

编辑*** 我解决了这个问题后，我初始化的视图控制器的更新位置。

Answer 1

import UIKit 
import CoreLocation 
@UIApplicationMain 

class AppDelegate: UIResponder, UIApplicationDelegate,CLLocationManagerDelegate { 
var window: UIWindow? 
var locationManager = CLLocationManager() 
var backgroundUpdateTask: UIBackgroundTaskIdentifier! 
var bgtimer = Timer() 
var latitude: Double = 0.0 
var longitude: Double = 0.0 
var current_time = NSDate().timeIntervalSince1970 
var timer = Timer() 
var f = 0 
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 
    self.doBackgroundTask() 
    return true 
} 


func applicationWillResignActive(_ application: UIApplication) { 
} 

func applicationWillEnterForeground(_ application: UIApplication) { 
    print("Entering foreBackground") 
} 

func applicationDidBecomeActive(_ application: UIApplication) { 
} 

func applicationWillTerminate(_ application: UIApplication) { 
} 

func applicationDidEnterBackground(_ application: UIApplication) { 
    print("Entering Background") 
    // self.doBackgroundTask() 
} 

func doBackgroundTask() { 

    DispatchQueue.main.async { 

     self.beginBackgroundUpdateTask() 

     self.StartupdateLocation() 


     self.bgtimer = Timer.scheduledTimer(timeInterval:-1, target: self, selector: #selector(AppDelegate.bgtimer(_:)), userInfo: nil, repeats: true) 
     RunLoop.current.add(self.bgtimer, forMode: RunLoopMode.defaultRunLoopMode) 
     RunLoop.current.run() 

     self.endBackgroundUpdateTask() 

    } 
} 

func beginBackgroundUpdateTask() { 
    self.backgroundUpdateTask = UIApplication.shared.beginBackgroundTask(expirationHandler: { 
     self.endBackgroundUpdateTask() 
    }) 
} 

func endBackgroundUpdateTask() { 
    UIApplication.shared.endBackgroundTask(self.backgroundUpdateTask) 
    self.backgroundUpdateTask = UIBackgroundTaskInvalid 
} 

func StartupdateLocation() { 
    locationManager.delegate = self 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest 
    locationManager.distanceFilter = kCLDistanceFilterNone 
    locationManager.requestAlwaysAuthorization() 
    locationManager.allowsBackgroundLocationUpdates = true 
    locationManager.pausesLocationUpdatesAutomatically = false 
    locationManager.startUpdatingLocation() 
} 

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) { 
    print("Error while requesting new coordinates") 
} 

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

    let locValue:CLLocationCoordinate2D = manager.location!.coordinate 

    self.latitude = locValue.latitude 
    self.longitude = locValue.longitude 
    f+=1 
    print("New Coordinates: \(f) ") 
    print(self.latitude) 
    print(self.longitude) 
} 

@objc func bgtimer(_ timer:Timer!){ 
    sleep(2) 
    /* if UIApplication.shared.applicationState == .active { 
     timer.invalidate() 
    }*/ 
    self.updateLocation() 
} 

func updateLocation() { 
    self.locationManager.startUpdatingLocation() 
    self.locationManager.stopUpdatingLocation() 
}} 

我加入了休眠功能延迟调用的位置并将信息发送到服务器

由于这两个应用程序是活动的运行和切换到后台。如果您只需要后台进程，请从didFinishLaunchingWithOptions中删除或注释函数self.doBackgroundTask（），并删除applicationdidEnterBackground中self.doBackgroundTask（）的注释。然后删除函数bgtimer（）中的注释，因为一旦应用程序进入活动状态，后台进程必须停止。

谢谢你使用你的代码，我只能让一些 替代解决方案连续运行。