Question

我正在编写一个具有后台位置支持的应用程序。该应用程序需要跟踪用户在送货路线上穿过城镇的位置点。

我使用CLLocationManager中的startUpdatingLocation（），直到应用程序在后台运行约15分钟为止，一切正常。

然后该应用似乎终止并且跟踪结束。

我知道这种连续跟踪（即MapMyRun）必须有效，但是我对方法感到困惑。

编辑：LocationManager的配置如下

self.locationManager?.desiredAccuracy = kCLLocationAccuracyBestForNavigation
self.locationManager?.distanceFilter = kCLDistanceFilterNone
self.locationManager?.allowsBackgroundLocationUpdates = true
self.locationManager?.pausesLocationUpdatesAutomatically = false
self.locationManager?.activityType = CLActivityType.automotiveNavigation
self.locationManager?.showsBackgroundLocationIndicator = true

Answer 1

要使位置更新在后台运行，您需要为您的应用启用“后台模式”功能。

如果不这样做，该应用程序将在操作系统认为合适的X倍的时间后在后台终止。

为此，请单击目标，转到功能选项卡，启用“后台模式”并勾选位置更新。有关更多详细信息，请参见屏幕截图

尝试一下，如果仍然无法正常工作，建议您将位置管理器代码上传到某处进行查看。

希望有帮助！

Answer 2

iOS在后台终止位置服务。您需要在iPhone设置中手动设置它。

To enable access, tap Settings > Location and select Always"

您可以显示警报以通知用户并进入设置。

func checkUsersLocationServicesAuthorization(){
        /// Check if user has authorized Total Plus to use Location Services
        if CLLocationManager.locationServicesEnabled() {
            switch CLLocationManager.authorizationStatus() {
            case .notDetermined:
                // Request when-in-use authorization initially
                // This is the first and the ONLY time you will be able to ask the user for permission
                self.locationManager.delegate = self
                locationManager.requestWhenInUseAuthorization()
                break

            case .restricted, .denied:
                // Disable location features
                let alert = UIAlertController(title: "Allow Location Access", message: "MyApp needs access to your location. Turn on Location Services in your device settings.", preferredStyle: UIAlertController.Style.alert)

                // Button to Open Settings
                alert.addAction(UIAlertAction(title: "Settings", style: UIAlertAction.Style.default, handler: { action in
                    guard let settingsUrl = URL(string: UIApplication.openSettingsURLString) else {
                        return
                    }
                    if UIApplication.shared.canOpenURL(settingsUrl) {
                        UIApplication.shared.open(settingsUrl, completionHandler: { (success) in
                            print("Settings opened: \(success)")
                        })
                    }
                }))
                alert.addAction(UIAlertAction(title: "Ok", style: UIAlertAction.Style.default, handler: nil))
                self.present(alert, animated: true, completion: nil)

                break

            case .authorizedWhenInUse, .authorizedAlways:
                // Enable features that require location services here.
                let alert = UIAlertController(title: "Allow Location Access", message: "Lookout does not have access to your location while in the background. To enable access, tap Settings > Location and select Always", preferredStyle: UIAlertController.Style.alert)

                // Button to Open Settings
                alert.addAction(UIAlertAction(title: "Settings", style: UIAlertAction.Style.default, handler: { action in
                    guard let settingsUrl = URL(string: UIApplication.openSettingsURLString) else {
                        return
                    }
                    if UIApplication.shared.canOpenURL(settingsUrl) {
                        UIApplication.shared.open(settingsUrl, completionHandler: { (success) in
                            print("Settings opened: \(success)")
                        })
                    }
                }))
                alert.addAction(UIAlertAction(title: "Not Now", style: UIAlertAction.Style.default, handler: nil))
                self.present(alert, animated: true, completion: nil)

                break
            }
        }
    }

为获得更高的准确性，也请调用此方法

func startLocationService(){
    locationManager.startUpdatingLocation()
    locationManager.startMonitoringSignificantLocationChanges()
    locationManager.pausesLocationUpdatesAutomatically = false
    locationManager.allowsBackgroundLocationUpdates = true
    locationManager.showsBackgroundLocationIndicator = true
}

别忘了在Target中启用后台模式->签名并 Capabilites

最后检查是在info.plist中添加权限

感谢您为后台实时定位所做的一切

Answer 3

退房

CLLocationManager.startMonitoringSignificantLocationChanges()

The Apple documentation here

Answer 4

您的应用在后台获取的位置更新完全由iOS处理，并且不受应用控制。

根据Apple有关后台定位服务的文档：

启用此模式不会阻止系统挂起应用程序，但是它确实告诉系统应该唤醒应用程序每当有新的位置数据要传递时。因此，这个关键有效地使应用程序在后台运行以处理位置随时更新。

有关更多信息，请参见Background Execution

iOS Swift后台位置监控

4 个答案: