Why dosen't CLLocationManager startUpdatingLocation fire in iOS8?
I am testing existing location functionality in iOS 8.0 using the simulators that ship with XCode 6. I cannot get CLLocationManager.startUpdatingLocation to trigger CLLocationManagerDelegate.locationManager: didUpdateLocations or CLLocationManagerDelegate.rorlocationManager: didFail .
I don't get the warning "My App" I like to use your current location "as on iOS 7.0.3. I used the Maps app to make sure my customized locations are set.
This works great in iOS 7.0.3 simulators.
Where am I going wrong?
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iOS 8 requires you to call CLLocationManager.requestWhenInUseAuthorization or CLLocationManager.requestAlwaysAuthorization before making a call CLLocationManager.startUpdatingLocation
.
@interface MyViewController : UIViewController <CLLocationManagerDelegate>
@property CLLocationManager *locationManager;
@end
requestWhenInUseAuthorization
and requestAlwaysAuthorization
run asynchronously, so you want your CLLocationManager object not to get cleaned up before use can respond to the warning.
- (void) viewDidAppear:(BOOL)animated {
if ([CLLocationManager locationServicesEnabled]) {
self.locationManager = [CLLocationManager new];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
SEL selector = NSSelectorFromString(@"requestWhenInUseAuthorization");
if ([self.locationManager respondsToSelector:selector]) {
[self.locationManager requestWhenInUseAuthorization];
} else {
[self.locationManager startUpdatingLocation];
}
} else {
...
}
}
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
if (status == kCLAuthorizationStatusAuthorizedWhenInUse) {
[self.locationManager startUpdatingLocation];
} else if (status == kCLAuthorizationStatusAuthorized) {
// iOS 7 will redundantly call this line.
[self.locationManager startUpdatingLocation];
} else if (status > kCLAuthorizationStatusNotDetermined) {
...
}
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
...
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
...
}
When you implement CLLocationManagerDelegate
, you now need to implement the locationManager: didChangeAuthorizationStatus: method . Within this method, you can check if the user has granted permission to the app or not and act accordingly.
If [CLLocationManager authorizationStatus] = nil
, then locationManager:didChangeAuthorizationStatus:
will be called if authorizationStatus is set kCLAuthorizationStatusNotDetermined
and again when the user makes their choice in the alert dialog.
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... Also add to Adrian Toman's answer
Don't forget to add NSLocationWhenInUseUsageDescription
or NSLocationAlwaysUsageDescription
to your application-Info.plist file.
Once you add the property to your plist, you also need to add a string value to it, this string value will be presented to the user when you ask for permission to use them.
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-(void)statLocationManager
{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone; //whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
[locationManager requestWhenInUseAuthorization]; // Add this Line
}
And add the following to Info.plist
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I ran into this problem once when I called startUpdatingLocation
, locationManager:(CLLocationManager *)manager didUpdateLocations:
didn't get a response. Even though I followed all the instructions others provided here, I could not get this method running.
Finally, I realized that it is important that this is necessary for the locationManager delegate to "itself" (where you implemented the method locationManager:(CLLocationManager *)manager didUpdateLocations:
).
In the end, everything went well after that.
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