我明白苹果只允许后台任务只有三分钟.我的应用程序更像是跟踪应用程序,即使应用程序在后台也可以跟踪用户的位置,因此我需要实现此功能.

我了解到,要使用beginBackgroundTaskWithExpirationHandler,但是我不知道我的实现是否正确.

注意：在plist toApp寄存器中有必要的后台模式用于位置更新.

任何工作代码或链接都非常感激.

override func viewDidLoad() {
    super.viewDidLoad()
 
    timeInMinutes = 1 * 60
 
    self.locationManager.requestAlwaysAuthorization()
 
    self.locationManager.requestWhenInUseAuthorization()
 
    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        locationManager.startUpdatingLocation()
    }
 
    var timer = NSTimer.scheduledTimerWithTimeInterval( timeInMinutes,target: self,selector: "updateLocation",userInfo: nil,repeats: true)
}
 
func locationManager(manager: CLLocationManager,didUpdateLocations locations: [CLLocation]){
    let locValue:CLLocationCoordinate2D = manager.location!.coordinate
 
    self.latitude = locValue.latitude
    self.longitude = locValue.longitude
 
    if UIApplication.sharedApplication().applicationState == .Active {
 
    } else {
        backgroundTaskIdentifier = UIApplication.sharedApplication().beginBackgroundTaskWithExpirationHandler({ () -> Void in
            self.backgroundTimer.invalidate()
            self.backgroundTimer = NSTimer.scheduledTimerWithTimeInterval( 60.0,repeats: true)
        })
    }
}
 
func updateLocation() {
    txtlocationLabel.text = String(n)
    self.n = self.n+1
 
    var timeRemaining = UIApplication.sharedApplication().backgroundTimeRemaining
 
    print(timeRemaining)
 
    if timeRemaining > 60.0 {
        self.GeoLogLocation(self.latitude,Longitude: self.longitude) {
            results in
            print("View Controller: \(results)")
            self.CheckResult(String(results))
        }
    } else {
        if timeRemaining == 0 {
            UIApplication.sharedApplication().endBackgroundTask(backgroundTaskIdentifier)
        }
 
        backgroundTaskIdentifier2 = UIApplication.sharedApplication().beginBackgroundTaskWithExpirationHandler({ () -> Void in
            self.backgroundTimer.invalidate()
            self.backgroundTimer = NSTimer.scheduledTimerWithTimeInterval( 60.0,repeats: true)
        })
    }
}