I'm monitoring a region using CLLocationManager's startMonitoringForRegion:desiredAccuracy:. I know for sure that the region gets properly added to the location manager's monitoredRegions.
I set this up while my simulator location is set far away from it (2.3 km to be precise). Then I hit the home button, and change the simulator's location to the very location I set a geofence for. locationManager:didEnterRegion: doesn't get called. Same results if I try moving to this location but from a another location, this one 4.3 km away.
There seems to be some threshold I can't pick up, as locationManager:didEnterRegion: gets called when moving from other locations at 7 km and up. But my CLRegion's radius is 100 m. What could possibly be the issue here?
This is truly just a wild guess, but I wonder if this is a result of the location manager attempting to mitigate false positives with a location that is seemingly jumping around. I imagine that changing the location in the simulator while the app is resigned could appear to the location manager as a location update that doesn't conform to the desired accuracy, thus disregarding it when considering whether you've actually entered a new region.
Have you tried simulating a city bike ride or freeway drive to see if it makes a difference? I would just try to test on a device as soon as possible.
Related
In my flutter app I have a map, which displays current location. Im using google_maps_flutter plugin, and enabled current location. The problem is, that when Im standing still, the location still moves around.
Can this somehow be prevented? To just completely freeze the map when standing still?
There is nothing wrong at your end, it is just how Google Maps work if it has less accuracy of the current location, it keeps jumping until it finds bit more accuracy.
You may want to test your app outdoor where GPS has better reception of satellites due to clear view of sky.
Try to useLocation package to get current location instead of google map's, you can control the time interval of retrieving current location
I want to know that locationManager:didUpdateLocations: will call when my phone is in stable position?
In my case its not calling when i put my phone on one place.
I Placed my phone from one location to other location within my room but still its not calling.
Can anyone tell me that when it will call.
When i change location using xcode then its always calling.
I used
self.locMgr.desiredAccuracy=kCLLocationAccuracyBest;
Okay, so you say within the simulator it works, but it does not work when you run your program on the actual iPhone device, right?
You were correct in setting the accuracy. This should work actually unless you have switched off the location update in general for your iPhone (settings under Privacy->Location Services).
If this is all working you maybe want to paste more of your code, but again, I think if it works under the simulator it should work on the device.
The location manager calls for location updates on the accuracy you set. It will not get called on a stable location more than once. you can use distance filter to call it after a certain distance.
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.distanceFilter = 10; //meters
For updating it on the same location you will have to use a timer which will call for updating after every desired interval.
Probably it depends on the accuracy you set to the locationManager.
1).. Cell Radio 2).. WiFi Map, 3).. GPS
If you set best as accuracy the location manager will continue to
check you position, if the location with better accuracy is out of the
range of the distance filter the delegate method will be called again.
GPS is not exact.some time if you move about a feet and still it will
not update. or some time you didn't moved at all and it will update.
Stop testing GPS and Location Services inside! Go outside and move around to test it.
Make sure that you set the delegate for the Location Manager & also
make sure you get the permission for using "User's Current Location."
how do I display the user location in a mapView while not running GPS to update the location (at all)? Will
mapView.userTrackingMode = kCLLocationAccuracyNearestTenMeters;
do the job or will GPS still burn battery in the background?
Thanks :)
I'm going to attempt to answer your question as best as i can given the limited information.
The GPS has 3 main modes that go from low power to high power, low accuracy to high accuracy.
Location Tracking off
Background location updates (uses cell towers and wifi)
GPS location updates
An MKMapView will show a blue dot for the user location if you set showsUserLocation to YES. The MKMapView will use all available location methods to find the users location as accurately as possible and keep updating it while this is set to YES.
The tracking in MKMapView, a mode which keeps the users location centred on screen, moves the visible map region as the user moves and is available in iOS5. you are given three MKUserTrackingModes to choose from. From the docs:
MKUserTrackingModeNone: The map does not follow the user location.
MKUserTrackingModeFollow: The map follows the user location.
MKUserTrackingModeFollowWithHeading: The map follows the user location
and rotates when the heading changes.
So setting it to kCLLocationAccuracyNearestTenMeters isn't going to work as it is not an available option in this context.
Will showing the location burn battery in the background? It depends on what you mean by background. When the user taps the home button the MKMapView is forced to stop using the GPS by the system. While the app is running and the MKMapView is alive and has the showsUserLocation property set to YES it will keep using any available method, including the GPS, to update the location. You have a couple of strategies to reduce this.
1) presume that the user needs to see their location updated while the map is on screen. In which case keep showsUserLocation set to YES until the map is moved off screen, or the device is locked, then set it to NO
2) Presume the user only needs to see a static marker of their location from a particular point in time, like when the app is opened. In this case you need to make a CLLocationManager object, ask it to startUpdatingLocation, filter the delegate messages for the accuracy you want, and then turn off location updates (stopUpdatingLocation). You can then add an MKAnnotation to the MKMapView to show the user their location.
As you can see number 2 is more work, yet very power efficient. Number 1 is easy, but will use more battery while the map is visible. It is up to you to decide which behaviour the user expects and to implement your app accordingly.
I'm writing an app that stores the location of the places you have been throughout the day. I've done a lot of research on CLLocationManager, and have been testing my app for the last 3 weeks. The locations I get with CLLocationManager sometimes is very inaccurate, sometimes 4 or 5 miles away from where I am.
I have a log in my test app and realized that every time I get a new location my DidUpdateToLocation method is called 3 times in a row, like within one second, and I get 3 different locations. One of them is always right, but the other 2 are off. I've tested with it with different accuracies(hundredMeters, nearestTenMeters, and Best), but still had the same problem. So, my first question is:
Is there anyway I can find out which of these locations is the right one so I can store it?
I've also realized that the user's current location on the map view is always very accurate, so I thought about getting the user's location from the mapView(blue dot) instead of the CLLocationManager, but I learned that a mapView object will only return the current location if the map is actually on screen, and this is not the case since I want my app to run in the background. So the second question is:
Is there anyway to get the user's current location from a mapView without the map being on screen? Or at least use the same technique the mapView uses for finding the current location?
If you have any experience with mapKit and CLLocationManager, please share your thoughts.
Thanks for you time. Any help is appreciated.
Is there anyway I can find out which of these locations is the right
one so I can store it?
Look at the horizontalAccuracy property of the locations that you receive. Don't use locations that are less accurate than what you're looking for.
I've also realized that the user's current location on the map view is
always very accurate
The map view probably doesn't have any special access to API's that are more accurate than what you've got, it just uses them better. Instead of starting from scratch each time you need a fix, try caching the location and then updating when you get a new location that's sufficiently accurate.
Take a look at Apple's sample code Locate Me. It uses the variable:
CLLocation *bestEffortAtLocation;
to determine upon updates if the location is less than the last location and less than a time limit set until the most accurate location is found.
In particular look at the GetLocationViewController in the sample code. I've used this code in my apps and it works great.
https://developer.apple.com/library/ios/#samplecode/LocateMe/Listings/Classes_GetLocationViewController_m.html#//apple_ref/doc/uid/DTS40007801-Classes_GetLocationViewController_m-DontLinkElementID_8
I have an application that gets the users location and draws a polyline on a map. At the start the app draws a line all over the place (where the gps trys to gain an accurate location). Is there any way to tell that the location is accurate and therefore start drawing.
i thought count and if statement that after say 5 location updates start- but should the user have a strong location then my app will fail.
Any Ideas?
Check out the CLLocation objects passed to your CLLocationManagerDelegate's
locationManager:didUpdateToLocation:fromLocation
method; they have, among other things, 2 properties available: horizontalAccuracy and verticalAccuracy.
They describe the radius of error, measured in meters.
http://developer.apple.com/library/ios/DOCUMENTATION/CoreLocation/Reference/CLLocation_Class/CLLocation/CLLocation.html#//apple_ref/occ/instp/CLLocation/horizontalAccuracy