I have a bluetooth device that triggers location services in my app when a button is pressed. And location services do run, but only for about 8 seconds. I have an NSLog outputting Location Found in the didUpdateToLocation delegate method. It outputs that NSLog for only that 8 seconds.
When I put the app in the foreground, location services continue again. Here is how I initialize the location manager:
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
[self.locationManager requestAlwaysAuthorization];
[self.locationManager requestWhenInUseAuthorization];
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[self.locationManager setAllowsBackgroundLocationUpdates:YES];
[self.locationManager allowsBackgroundLocationUpdates];
When button is pressed, I run this:
[self.locationManager startUpdatingLocation];
You need enabling the background mode (location), as long as your location-manager is capable to receive location-updates, your app will receive all bluetooth data.
As #Paulw11 mentioned in comments, using significant-location-updates will drastically reduce battery usage.
Here is the link to Apple guide.
Here is the link to a question related to getting location updates in background.
Related
In my current app i am using
self.locationManager = [[CLLocationManager alloc] init];
if ([_locationManager respondsToSelector:#selector(requestAlwaysAuthorization)])/
[_locationManager requestAlwaysAuthorization];
//self.locationManager.allowsBackgroundLocationUpdates = YES;
self.locationManager.delegate = self;
[self.locationManager startMonitoringForRegion:tempRegio
[self.locationManager startRangingBeaconsInRegion:beaconRegion];
in this case nowhere i need to know user's location still my app asks that it will use you current location even when you're not using this app
Which is annoying for end user plus it constantly display purple arrow on the statubar indicating that the app uses GPS (Which it does not )
My question is
Can we have mechanism where we can scan the beacon without use of CLLocationManager
1 possible solution is to use CBCentralManager but i do not find a proper way where i can use it to detect beacons/ibeacons
Thanks
I need to do that if is possible use the "Suggested apps" feature using IBeacons
This is my code:
self.beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid major:1 minor:1 identifier:#"EstimoteSampleRegion"];
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
[self.locationManager startRangingBeaconsInRegion:self.beaconRegion];
[self.locationManager requestAlwaysAuthorization];
[self.locationManager startUpdatingLocation];
Background method's are called,like didRangeBeacons, but my lockscreen is empty.
Thanks!
For the Suggested Apps feature, you need to use startMonitoringForRegion instead of the startRangingBeaconsInRegion.
Also, it seems you're doing ranging in the background ([self.locationManager startUpdatingLocation]; + a Background Mode for Location Services which I assume you enabled), you don't need that for the Suggested Apps feature. It'll drain the phone's battery (because it keeps the apps awake) and Apple usually rejects apps that do it without a good reason (e.g. a navigation app that's augmented with support for beacons).
I want that at fist 30 minutes my application will using my GPS in the background so i do the following:
CLLocationManager *locationManager = nil;
locationManager = [[CLLocationManager alloc] init];
locationManager.distanceFilter = kCLLocationAccuracyBest;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.pausesLocationUpdatesAutomatically = NO;
// Do any additional setup after loading the view from its nib.
[locationManager requestAlwaysAuthorization];
After 30 minutes i want that my application will run only in foreground...
How can i remove the thread which using my gps in background?
As i understood i need to add [locationManager stopUpdatingLocation] and [locationManager requestWhenInUseAuthorization];
it works but in the app settings under privacy -> location services- > then there is 3 options: 1)never 2) While using the app 3)Always and even the app not running in the background then the third option is selected still 3)Always I want that the setting will change to "While using the app"
The authorisation process is separate to actually requesting location updates be delivered to your CLLocationManagerDelegate.
Once you have been granted permission to use location (either always or when in use) you can then use [locationManager startUpdatingLocation] and [locationManager stopUpdatingLocation] to control whether location updates are delivered to your delegate.
So, the short answer is call [locationManager stopUpdatingLocation] after 30 minutes.
I am trying to get authorization from user before fetching his location. I am using this code for that:
self.locationManager = [[CLLocationManager alloc] init];
[self.locationManager setDelegate:self];
if ([self.locationManager respondsToSelector:#selector(requestAlwaysAuthorization)]) {
// iOS8+
// Sending a message to avoid compile time error
[self.locationManager requestAlwaysAuthorization];
}
[self showIndicatorView];
self.getCityService = [[GetCitiesService alloc] initServiceWithDelegate:self isLocalCall:NO];
[self.getCityService fetchCities];
I see the alert on screen but before I allow it or not, it disappear form screen and app is not authorized.
I want my code to stop until user gives permission.
Apparently in iOS 8 SDK, requestAlwaysAuthorization (for background location) or requestWhenInUseAuthorization (location only when foreground) call on CLLocationManager is needed before starting location updates.
There also needs to be NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription key in Info.plist with a message to be displayed in the prompt. Adding these solved my problem.
Hope it helps someone else.
EDIT: For more extensive information, have a look at: http://nevan.net/2014/09/core-location-manager-changes-in-ios-8/
You code looks really weird, since you seem to be calling the requestAlwaysAuthorization twice. Once on self.locationManager and once via the sendAction.
You code should look like:
self.locationManager = [[CLLocationManager alloc] init];
[self.locationManager setDelegate:self];
if ([self.locationManager respondsToSelector:#selector(requestAlwaysAuthorization)]) {
// iOS8+
// Sending a message to avoid compile time error
[self.locationManager requestAlwaysAuthorization];
}
when I'm trying to show the user location on my map it shows the location is somewhere in the ocean (lat = 0.000 , lon = 0.000) , I have set the simulated location to be in london and still nothing.
when i try to compile the app on my iphone its doesn't ask for permission to get user current location , just when i enable the app for using location services in the iphone settings , the app shows the user current location.
any idea why it does it?
this is my viewDidLoad :
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
_locationManager = [[CLLocationManager alloc] init];
if(IS_OS_8_OR_LATER) {
[_locationManager requestWhenInUseAuthorization];
[_locationManager requestAlwaysAuthorization];
}
_locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
_locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[_locationManager startUpdatingLocation];
There is no need to adding both they both do different things
[_locationManager requestWhenInUseAuthorization];
[_locationManager requestAlwaysAuthorization];
requestWhenInUseAuthorization
use [_locationManager requestWhenInUseAuthorization]; when you want to get location updates when app is Active of foreground mode and not when in background .
requestAlwaysAuthorization
use [_locationManager requestAlwaysAuthorization]; when you want to get location updates Even when your app is in background mode. So OS would ask for permissions accordingly
Adding Keys to info.Plist
It is now mandetory to add either NSLocationWhenInUseUsageDescription or NSLocationAlwaysUsageDescription Key to your info.Plist depending upon which permission you are asking for .
The value to this key should be a NSString explaining user why the app wants to use location services something like "We need your location for XYZ reason"
If iOS does not find above key in your Plist file , it will ignore location request.
Hope this helps. By the way I reccomand you to watch WWDC 2014 video "Whats new in Core Location", all iOS8 changes have been nicely explained.
Other Changes in Code
Also one more thing i see in your code , You are creating new instance of _locationManager in 3rd line , Means you are creating new object after assigning delegate to locationManager, should not do that too.