What I do is implement a singleton class to manage updates from core location. To access my current location, I do a CLLocation *myLocation = [[LocationManager sharedInstance] currentLocation]; If you wanted to block the main thread you could do something like this: while ([[LocationManager sharedInstance] locationKnown] == NO){ //blocking here //do stuff here, dont forget … Read more
I had a similar error, and is solved now. The issue is declaring locationManager variable locally. Declare it instead as a class variable and make sure it is retained either directly or via property retain (or strong if you use ARC). That solves the problem! The issue was de locationManager variable was released and never … Read more
You can find your location using CoreLocation like this: import CoreLocation: #import <CoreLocation/CoreLocation.h> Declare CLLocationManager: CLLocationManager *locationManager; Initialize the locationManager in viewDidLoad and create a function that can return the current location as an NSString: – (NSString *)deviceLocation { return [NSString stringWithFormat:@”latitude: %f longitude: %f”, locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude]; } – (void)viewDidLoad { locationManager = [[CLLocationManager alloc] … Read more
Some iOS devices have a real GPS chip allowing you to get location data even with no Internet connection. I believe the last few iPhones all have GPS. Some of the iPad models have GPS. I don’t believe any of the iPod touch models have GPS. Obviously without Internet you can’t show any map data … Read more
I don’t think region monitoring will work well for such a small radius. The best accuracy with the GPS chip and kCLLocationAccuracyBestForNavigation is often just 10 meters. Apple says (in the Location & Maps PG) that the minimum distance for regions should be assumed to be 200m I’ve heard that region monitoring is using WiFi … Read more
Since I asked this question, I have done a fair bit of testing (mostly on the train between home and work) and have confirmed that the behaviour for suspended apps is as I suspected at the end of the question. That is, your suspended app is woken up, you don’t receive any callbacks on your … Read more
Your code seems fine to me. Nothing wrong with the calculous. You don’t specify how far off your results are, but you might try tweaking your radian/degrees converters to this: double DegreesToRadians(double degrees) {return degrees * M_PI / 180.0;}; double RadiansToDegrees(double radians) {return radians * 180.0/M_PI;}; If you are getting negative bearings, add 2*M_PI to … Read more
It can be done but it is unreliable because you ask the OS for time to send something and it can accept or deny your request. This is what I have (stolen from somewhere on SO): […] //we get the new location from CLLocationManager somewhere here BOOL isInBackground = NO; if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground) … Read more
A conversion to Swift, taken from this answer: func locationWithBearing(bearingRadians:Double, distanceMeters:Double, origin:CLLocationCoordinate2D) -> CLLocationCoordinate2D { let distRadians = distanceMeters / (6372797.6) // earth radius in meters let lat1 = origin.latitude * M_PI / 180 let lon1 = origin.longitude * M_PI / 180 let lat2 = asin(sin(lat1) * cos(distRadians) + cos(lat1) * sin(distRadians) * cos(bearingRadians)) let … Read more
The easiest technique is to just shift the map down, say 40% from where the coordinate would be, taking advantage of the span of the region of the MKMapView. If you don’t need actual pixels, but just need it to move down so that the CLLocationCoordinate2D in question is near the top of the map … Read more