I am new to iOS and Objective C programming. I am trying to build Core Location Framework to get location. In Android, we can get location from different providers, like GPS,network,WiFi and fused.
Now, in iOS, I can get location by specifying only accuracy,
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
But, how I make sure, that location is coming from GPS, or Network or any other provider?
Thanks
In iOS you need not worry about location provider. Based on the accuracy you are setting, iOS framework will itself take decision and will push the location. You can not specify location provider in iOS.
Related
Is there any way or method for getting the source of location if it is coming from GPS or from Wifi?
Thanks.
Imho there is no way how to decide if signal comes from GPS or WIFI or whatever (this handles CoreLocation framework) - but you can still "decide" depending on current accuracy - the horizontalAccuracy property and verticalAccuracy property in CLLocation object.
So we are using Skobbler iOS SDK and offline maps functionality for our iOS app and we were testing it while we were in Spain, and we were able to see our current location but as we moved around the current location didn't move with us.
What values does Skobbler use for the desiredAccuracy and distanceFilter and also does it use standard location updates of significant location updates? Is there a way to set these values ourselves?
If you would like to have the map follow your position you have to set:
mapView.settings.followUserPosition = YES;
For accuracy it's used kCLLocationAccuracyBest but you cannot change it at this time.
The distance filter is 1 for normal location updates and 500 for significant location updates.
You can choose to have normal location updates or significant location updates using startSignificantLocationUpdate/cancelSignificantLocationUpdate and startLocationUpdate/cancelLocationUpdate methods from SKPositionerService.
I was wondering if we can get the source type of the current location in iOS. I didn't find any reference nor in CLLocationManager neither in CLLocation.
I've found the same question here in SO, but for Android:
Is it possible to know my location came from gps or glonass?
Android. How to know if location detected is from GPS or Network provider
The second one has an answer that says if the accuracy is smaller than 30 meters, than it is using GPS. But I don't know if we really can assume that.
I am Having a problem In Location Accuracy Using Cellular Network.
Following are the My issues
Sometimes Location accuracy is very perfect in Cellular Networks(3G)
Sometimes Location Accuracy is Not getting perfectly Its one mile difference.
For WiFi Its working Very Perfectly.
Following are My code
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
[locationManager startUpdatingLocation];
Please what is the problem for my code.
Cellular network location gives an approximate area were the phone existing. It is based on the service providers tower.So i recommend using gps location tracking so that you get the exact longitude and latitude of your phone.
Longitude and latitude can be used to find more details about the location like place,weather etc..
Please refer this
This is because you can't force the device the location trough satellite (3G or 4G)
You (the app) can only access the location the device gets (And if it have permission).
When you have highest accuracy kCLLocationAccuracyBestForNavigation it will try to get the most accuracy it can get (First GPS, then triangulation/network + aditional sensor data) (Not recommended, this is only for "navigation" it consumes too much energy and assumes it is plugged in).
For this please refer to the Core Location Constants Reference
If you are outdoors you may not have exact location at first, it may take some time to get the best location available to the phone.
Please reffer to the documentation of CLLocationManager desiredAccuracy
When requesting high-accuracy location data, the initial event
delivered by the location service may not have the accuracy you
requested. The location service delivers the initial event as quickly
as possible. It then continues to determine the location with the
accuracy you requested and delivers additional events, as necessary,
when that data is available.
In Android whenever you get location object you could call "location.getProvider" on the instance to get value like "wifi". Is there something similar in iOS (CLLocation)?
The Location Awareness Programming Guide says:
The [CoreLocation] framework uses information obtained from the built-in cellular, Wi-Fi, or GPS hardware to triangulate a location fix for the device. It reports that location to your code and, depending on how you configure the service, also provides periodic updates as it receives new or improved data
Having said that, you do not have access to how precisely the CLLocationManager determined your location (other than, if you used significant change, that it probably used cell towers). You theoretically could use Reachability to see if you have Wi-Fi availability, but you have no assurances as to what mix of GPS, cellular, and Wi-Fi it used to get your location (even if you happen to have WiFi connection).
What you do have is horizontalAccuracy, which tells you approximately how accurate the location you received is. From a user's perspective, that's probably a more important piece of information.
There isn't a concept of what system provided you with the location on iOS. What you can do is check what the accuracy of the location is. Based on how precise the location is, you can probably surmise if the location was provided by a GPS signal.
The reason this isn't given is that iOS will provide you with an initial location which won't be very accurate (likely based on geo-ip or cell triangulation) and then update the location with more and more precise coordinates if GPS is available.
If your application requires the accuracy provided by a GPS chip, you can add UIRequiredDeviceCapabilities = gps to your Info.plist.