didUpdateLocations not called

问题:

I'm trying to get my current location, but the break point in didUpdateLocations is never being called.

LocationManager:

locationManager = [[CLLocationManager alloc] init];
[locationManager setDelegate:self];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
[locationManager setDesiredAccuracy:kCLDistanceFilterNone];
[locationManager startUpdatingLocation];

Delegate method:

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations;

I confirmed that location services and enabled and authorized.

Why is the locationManager delegate method not being called like it should?

Thanks, Mike

回答1:

Furthermore in iOS8 you must have two extra things:

• Add a key to your Info.plist and request authorization from the location manager asking it to start.

  • NSLocationWhenInUseUsageDescription

  • NSLocationAlwaysUsageDescription

• You need to request authorization for the corresponding location method.

  • [self.locationManager requestWhenInUseAuthorization]

  • [self.locationManager requestAlwaysAuthorization]

Code example:

self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
// Check for iOS 8. Without this guard the code will crash with "unknown selector" on iOS 7.
if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
    [self.locationManager requestWhenInUseAuthorization];
}
[self.locationManager startUpdatingLocation];

Source: http://nevan.net/2014/09/core-location-manager-changes-in-ios-8/

回答2:

When I had this problem, it was due to a threading issue.

Make sure, that all of these methods are called on the main thread. It is very important, that not only the startUpdatingLocation method is called on the main thread, but the others as well.

You can force code to be run on the main thread by wrapping it inside

dispatch_sync(dispatch_get_main_queue(), ^{

});

Also check out this answer.

回答3:

Make sure you added CLLocationManager as a property.

@property (nonatomic , strong) CLLocationManager *locationManager;

回答4:

Yes, the property was the solution for me, and good idea to check the Location Service is enabled:

if ([CLLocationManager locationServicesEnabled]) {
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [self.locationManager startUpdatingLocation];
}

回答5:

You do have to tell the simulator what location to simulate. If you don't specify a location your CLLocationManager delegate methods will never get called. You can use the simulator menu Debug -> Location. Also in Xcode down by the debug area there's a little location arrow that appears when running the app from Xcode. You can use that to specify a GPX file to simulate motion (it's still not the same as the real device though).

https://devforums.apple.com/message/1073267#1073267

回答6:

If CLLocationManagerDelegate is set, MapView Delegate is also set

Also Check the location of the simulator, Click on Simulator > Debug > Location, if it is none change into city run or freeway drive. Its worked for me.

回答7:

Please note that in iOS 11 and later, a third key has to be supplied to your info.plist: NSLocationAlwaysAndWhenInUseUsageDescription