How can I check if location service is enabled for my app?
I have 2 storyboards and I want to check location service. If location service enabled for my app, I want to launch map storyboard with location. Otherwise, I want to launch another storyboard. How can I do programmatically?
This is the correct.
if ([CLLocationManager locationServicesEnabled]){
NSLog(@"Location Services Enabled");
if ([CLLocationManager authorizationStatus]==kCLAuthorizationStatusDenied){
alert = [[UIAlertView alloc] initWithTitle:@"App Permission Denied"
message:@"To re-enable, please go to Settings and turn on Location Service for this app."
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
}
}
Tested on iOS 9.2
For getting location updates we should always check
and launching user on correct settings screen to enable
Launch iOS Device Location Settings page
Step.1 Go to Project settings --> Info --> URL Types --> Add New URL Schemes
Step.2 Use below code to launch direct phone's location settings page: (Note: The URL Scheme is different in iOS 10+, we check the version as stated here)
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice
currentDevice] systemVersion] compare:v options:NSNumericSearch] ==
NSOrderedAscending)
//Usage
NSString* url = SYSTEM_VERSION_LESS_THAN(@"10.0") ? @"prefs:root=LOCATION_SERVICES" : @"App-Prefs:root=Privacy&path=LOCATION";
[[UIApplication sharedApplication] openURL:[NSURL URLWithString: url]];
Launch Application Location Settings page
Use below code to launch direct application's location settings page
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
Here is the full code example :
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice
currentDevice] systemVersion] compare:v options:NSNumericSearch] ==
NSOrderedAscending)
CLLocationManager *locationManager;
-(void) checkLocationServicesAndStartUpdates
{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
if ([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
{
[locationManager requestWhenInUseAuthorization];
}
//Checking authorization status
if (![CLLocationManager locationServicesEnabled] && [CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied)
{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Location Services Disabled!"
message:@"Please enable Location Based Services for better results! We promise to keep your location private"
delegate:self
cancelButtonTitle:@"Settings"
otherButtonTitles:@"Cancel", nil];
//TODO if user has not given permission to device
if (![CLLocationManager locationServicesEnabled])
{
alertView.tag = 100;
}
//TODO if user has not given permission to particular app
else
{
alertView.tag = 200;
}
[alertView show];
return;
}
else
{
//Location Services Enabled, let's start location updates
[locationManager startUpdatingLocation];
}
}
Handle the user click respone, and launch correct location settings
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if(buttonIndex == 0)//Settings button pressed
{
if (alertView.tag == 100)
{
//This will open ios devices location settings
NSString* url = SYSTEM_VERSION_LESS_THAN(@"10.0") ? @"prefs:root=LOCATION_SERVICES" : @"App-Prefs:root=Privacy&path=LOCATION";
[[UIApplication sharedApplication] openURL:[NSURL URLWithString: url]];
}
else if (alertView.tag == 200)
{
//This will opne particular app location settings
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
}
}
else if(buttonIndex == 1)//Cancel button pressed.
{
//TODO for cancel
}
}
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
NSLog(@"%@",error.userInfo);
if([CLLocationManager locationServicesEnabled]){
NSLog(@"Location Services Enabled");
if([CLLocationManager authorizationStatus]==kCLAuthorizationStatusDenied){
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"App Permission Denied"
message:@"To re-enable, please go to Settings and turn on Location Service for this app."
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
}
}
}
Reason behind this, this method will call when your service will be disable the location service. this code is useful for me.
Check CLLocationManager's locationServicesEnabled property to check the system-wide availability. Use your CLLocationManagerDelegate's locationManager: didFailWithError: method and check for a kCLErrorDenied error to see if the user denied location services.
BOOL locationAllowed = [CLLocationManager locationServicesEnabled];
if (!locationAllowed)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Location Service Disabled"
message:@"To re-enable, please go to Settings and turn on Location Service for this app."
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
for your app use this code
- (void)viewDidLoad
{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
// Set a movement threshold for new events.
locationManager.distanceFilter = 500;
[locationManager startUpdatingLocation];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray *)locations {
// If it's a relatively recent event, turn off updates to save power
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"%@",error);
}
if location service disable for your app then its give you error
Error Domain=kCLErrorDomain Code=1 "The operation couldn’t be completed. (kCLErrorDomain error 1.)"
Updated in Latest Swift 5.0, Xcode 11.2.1
import UIKit
import CoreLocation
User constants
struct UserConstants {
static let latitude = "latitude"
static let longitude = "longitude"
static let lastKnownLatitude = "lastKnownLatitude"
static let lastKnownLongitude = "lastKnownLongitude"
}
Location Manager Delegate for monitoring location changes
@objc protocol LocationManagerDelegate {
@objc optional func getLocation(location: CLLocation)
}
class LocationHelper: NSObject, CLLocationManagerDelegate {
weak var locationManagerDelegate: LocationManagerDelegate?
var isLocationfetched: Bool = false
var lastKnownLocation: CLLocation? {
get {
let latitude = UserDefaults.standard.double(forKey: UserConstants.lastKnownLatitude)
let longitude = UserDefaults.standard.double(forKey: UserConstants.lastKnownLongitude)
if latitude.isZero || longitude.isZero {
return nil
}
return CLLocation(latitude: latitude, longitude: longitude)
}
set {
UserDefaults.standard.set(newValue?.coordinate.latitude ?? 0, forKey: UserConstants.lastKnownLatitude)
UserDefaults.standard.set(newValue?.coordinate.longitude ?? 0, forKey: UserConstants.lastKnownLongitude)
UserDefaults.standard.synchronize()
}
}
struct SharedInstance {
static let instance = LocationHelper()
}
class var shared: LocationHelper {
return SharedInstance.instance
}
enum Request {
case requestWhenInUseAuthorization
case requestAlwaysAuthorization
}
var clLocationManager = CLLocationManager()
func setAccuracy(clLocationAccuracy: CLLocationAccuracy) {
clLocationManager.desiredAccuracy = clLocationAccuracy
}
var isLocationEnable: Bool = false {
didSet {
if !isLocationEnable {
lastKnownLocation = nil
}
}
}
Location updates with authorization check
func startUpdatingLocation() {
isLocationfetched = false
if CLLocationManager.locationServicesEnabled() {
switch CLLocationManager.authorizationStatus() {
case .notDetermined:
clLocationManager.delegate = self
clLocationManager.requestWhenInUseAuthorization()
clLocationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
clLocationManager.startUpdatingLocation()
isLocationEnable = true
case .restricted, .denied:
showLocationAccessAlert()
isLocationEnable = false
case .authorizedAlways, .authorizedWhenInUse:
self.clLocationManager.delegate = self
self.clLocationManager.startUpdatingLocation()
isLocationEnable = true
default:
print("Invalid AuthorizationStatus")
}
} else {
isLocationEnable = false
showLocationAccessAlert()
}
}
Show location alert if permission is not allowed
func showLocationAccessAlert() {
let alertController = UIAlertController(title: "Location Permission Required", message: "Please enable location permissions in settings.", preferredStyle: UIAlertController.Style.alert)
let okAction = UIAlertAction(title: "settings", style: .default, handler: {(cAlertAction) in
UIApplication.shared.open(URL(string: UIApplication.openSettingsURLString)!)
})
let cancelAction = UIAlertAction(title: "cancel", style: UIAlertAction.Style.cancel)
alertController.addAction(cancelAction)
alertController.addAction(okAction)
let appdelegate = UIApplication.shared.delegate as? AppDelegate
appdelegate?.window?.rootViewController?.present(alertController, animated: true, completion: nil)
}
func stopUpdatingLocation() {
self.clLocationManager.stopUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if !isLocationfetched {
isLocationfetched = true
clLocationManager.startMonitoringSignificantLocationChanges()
NotificationCenter.default.post(name: NSNotification.Name.updateLocationNotification, object: nil)
}
let userLocation = locations[0] as CLLocation
self.lastKnownLocation = userLocation
if let delegate = self.locationManagerDelegate {
delegate.getLocation!(location: userLocation)
}
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
if (status == CLAuthorizationStatus.denied) {
// The user denied authorization
isLocationEnable = false
} else if (status == CLAuthorizationStatus.authorizedWhenInUse) {
// The user accepted authorization
self.clLocationManager.delegate = self
self.clLocationManager.startUpdatingLocation()
isLocationEnable = true
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print("\n error description for location updation:- \(error.localizedDescription)")
}
}
For testing above, just write these line of code in your controller,
LocationHelper.shared.locationManagerDelegate = self
LocationHelper.shared.startUpdatingLocation()
LocationManagerDelegate Methods
extension ViewController: LocationManagerDelegate {
func getLocation(location: CLLocation) {
currentLocation = location.coordinate
}
}
After a lot of investigation. I would recommend to display this message on a label and not on an alert view. because, there are a lot of cases to test against(user disables location service in general or just for app. delete app, reinstall).
One of these cases causes your alert to show your message along with apple's alert message at the same time. your alert will be behind apple's alert. which is a confusing and un-logical behavior.
I recommend the following:
Swift 3:
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
switch status {
case .notDetermined:
Log.verbose("User still thinking granting location access!")
manager.startUpdatingLocation() // this will access location automatically if user granted access manually. and will not show apple's request alert twice. (Tested)
break
case .denied:
Log.verbose("User denied location access request!!")
// show text on label
label.text = "To re-enable, please go to Settings and turn on Location Service for this app."
manager.stopUpdatingLocation()
loadingView.stopLoading()
break
case .authorizedWhenInUse:
// clear text
label.text = ""
manager.startUpdatingLocation() //Will update location immediately
break
case .authorizedAlways:
// clear text
label.text = ""
manager.startUpdatingLocation() //Will update location immediately
break
default:
break
}
}
Objective-C:
- (void)locationManager:(CLLocationManager*)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
switch (status) {
case kCLAuthorizationStatusNotDetermined: {
DDLogVerbose(@"User still thinking granting location access!");
[locationManager startUpdatingLocation]; // this will access location automatically if user granted access manually. and will not show apple's request alert twice. (Tested)
} break;
case kCLAuthorizationStatusDenied: {
DDLogVerbose(@"User denied location access request!!");
// show text on label
label.text = @"To re-enable, please go to Settings and turn on Location Service for this app.";
[locationManager stopUpdatingLocation];
[loadingView stopLoading];
} break;
case kCLAuthorizationStatusAuthorizedWhenInUse:
case kCLAuthorizationStatusAuthorizedAlways: {
// clear text
label.text = @"";
[locationManager startUpdatingLocation]; //Will update location immediately
} break;
default:
break;
}
}
The best way, handling all cases! ->
//First, checking if the location services are enabled
if(![CLLocationManager locationServicesEnabled]){
[self showMessage:@"Please enable location services to detect location!" withTitle:@"Location not enabled"];
}
else if ([CLLocationManager authorizationStatus]==kCLAuthorizationStatusDenied){
//Now if the location is denied.
UIAlertController *alertController = [UIAlertController
alertControllerWithTitle:@"Enable location permission"
message:@"To auto detect location, please enable location services for this app"
preferredStyle:UIAlertControllerStyleAlert];
alertController.view.tintColor = AppColor;
UIAlertAction *cancelAction = [UIAlertAction
actionWithTitle:@"Dismiss"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction *action)
{
NSLog(@"Cancel action");
}];
UIAlertAction *goToSettings = [UIAlertAction
actionWithTitle:@"Settings"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action)
{
//Simple way to open settings module
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
[[UIApplication sharedApplication] openURL:url];
}];
[alertController addAction:cancelAction];
[alertController addAction:goToSettings];
[self presentViewController:alertController animated:YES completion:^{
alertController.view.tintColor = AppColor;
}];
}
else{
//Do whatever you want here
}
Swift 3.0 & iOS 10 Solution:
self.locationManager?.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() && CLLocationManager.authorizationStatus() != CLAuthorizationStatus.denied {
locationManager?.delegate = self
locationManager?.desiredAccuracy = kCLLocationAccuracyBestForNavigation
locationManager?.distanceFilter = distanceFiler
locationManager?.startUpdatingLocation()
}else{
let alertView = UIAlertView(title: "Location Services Disabled!", message: "Please enable Location Based Services for better results! We promise to keep your location private", delegate: self, cancelButtonTitle: "Settings", otherButtonTitles: "Cancel")
alertView.delegate = self
alertView.show()
return
}
@objc(alertView:clickedButtonAtIndex:) func alertView(_ alertView: UIAlertView, clickedButtonAt buttonIndex: Int) {
if buttonIndex == 0 {
if let url = URL(string: "App-Prefs:root=LOCATION_SERVICES") {
UIApplication.shared.open(url, completionHandler: .none)
}
}
else if buttonIndex == 1 {
//TODO for cancel
}
}
