ios 9 app不在后台报告位置

Question

I am writing (in Swift) an iOS 9 app that needs location updates including in background mode. The problem is that I only get location updates in foreground. I think I have done everything correctly:

In info.plist:

• Specified a value for NSLocationAlwaysUsageDescription.

• Specified a value for NSLocationUsageDescription.

• Specified a value for NSLocationWhenInUseUsageDescription.

• Included "location" in UIBackgroundModes.

• Included "gps" and "location-services" in UIRequiredDeviceCapabilities

• Started the location manager as follows:

   let locationManager = CLLocationManager() locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters locationManager.distanceFilter = 250.0 locationManager.allowsBackgroundLocationUpdates = true locationManager.startUpdatingLocation() 

• I have also verified that locationManager.pausesLocationUpdatesAutomatically is false.

I get no location updates while the app is not in the foreground. The only time I do get location updates is if I bring the app to foreground, and even then, not all the time.

Any idea what's going wrong? Or my expectations incorrect?

Answer 1

How are you sending the app to the background? If you swipe to kill then your app won't automatically restart to receive the location events. I don't see it in your code, did you call requestAlwaysAuthorization? You might also want to implement LocationManager:didFailWithError just to see if that gives you any ideas.