Current location on maps is not accurate. didUpdateLocations iPhone - ios

Question

I am working on app where I need exact current location. The current location works fine when I am outdoors in iOS app. But when I am inside a building the current location is inaccurate. Its 100 meter away from my exact location.
The setting for location manager are as follows:
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = 100
locationManager.allowsBackgroundLocationUpdates = true
And I am calling this function for location updates:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location: CLLocation = locations.last!
self.updatedLocation = location
}
The current location works fine on Android devices in buildings.
One thing that I have observed that when I open the Apple Maps and Google Maps app the current
location is the same as I am getting in my app but they have a light blue circle showing that you could be anywhere around that area.
Is there anyway I could improve the current location when I am inside a building?
Any help would be appreciated.
First image is screenshot from iOS where current location is inaccurate and the second image is screenshot from Android device where the location is precise.

Answer 1

I have noticed this problem as well, especially with find my iphone, when i'm in a building the location of my phone is always 50-100 m away i didn't know why.
Currently I'm working on an app that require the exact location, so one thing you can do is check the horizontalAccuracy property on the CLLocation that you're being returned. If this is above a certain threshold then you could throw away the result and wait for a more accurate one. If it is a number of miles out then I would expect the accuracy figure to be quite large. It's most likely using a cell site to determine location rather than GPS, and the margin of error would be much greater.
Here it is an example from my own application:
func requestUserLocation(){
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.distanceFilter = kCLDistanceFilterNone
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
}
Then on didUpdateLocations function I'll do the check
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
manager.desiredAccuracy = 1000 // 1km accuracy
if locations.last!.horizontalAccuracy > manager.desiredAccuracy {
// This location is inaccurate. Throw it away and wait for the next call to the delegate.
print("i don't want this location")
return;
}
// This is where you do something with your location that's accurate enough.
guard let userLocation = locations.last else {
print("error getting user location")
return
}
}