How do I zoom an MKMapView to the user's current location - ios

Question

I am trying to show the mkmapview to the users current location. They will display only city name. But they are not specify the exact users current location. I want to display the users exact location. Please give me any idea how to zoom the users current location.
GPSlocationAPPDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.locationManager=[[CLLocationManager alloc]init];
if([CLLocationManager locationServicesEnabled])
{
self.locationManager.delegate=self;
self.locationManager.distanceFilter=1;
[self.locationManager startUpdatingLocation];
}
self.viewController = [[AnimationViewController alloc] initWithNibName:#"AnimationViewController" bundle:nil];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
double miles=12.0;
double scalingFactor= ABS( cos(2 * M_PI * newLocation.coordinate.latitude /360.0) );
MKCoordinateSpan span;
span.latitudeDelta=miles/69.0;
span.longitudeDelta=miles/(scalingFactor*69.0);
MKCoordinateRegion region;
region.span=span;
region.center=newLocation.coordinate;
[self.viewController.mapView setRegion:region animated:YES];
self.viewController.mapView.showsUserLocation=YES;
}

Answer 1

locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = kCLLocationAccuracyKilometer;
[locationManager startUpdatingLocation];
CLLocation *location = [locationManager location];
coordinate = [location coordinate];
latitude = coordinate.latitude;
longitude = coordinate.longitude;
mapview.region = MKCoordinateRegionMakeWithDistance(coordinate, 10000, 10000);

Answer 2

Other option to get the user location is adding observer to mapview in viewDidLoad method like this
-(void)viewDidLoad
{
[super viewDidLoad]
//register the observer
[self.mapView.userLocation addObserver:self
forKeyPath:#"location"
options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld)
context:NULL];
}
and whenever this observer will call just do this
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context
{
MKCoordinateRegion region;
region.center = self.mapView.userLocation.coordinate;
//Adjust span as you like
MKCoordinateSpan span;
span.latitudeDelta = 1;
span.longitudeDelta = 1;
region.span = span;
[self.mapView setRegion:region animated:YES];
}

Answer 3

Steps:
1) In ViewWillAppear
[self.mapView setMapType:MKMapTypeStandard];
[self.mapView setZoomEnabled:YES];
[self.mapView setScrollEnabled:YES];
[self.mapView setDelegate:self];
locationManager = [[CLLocationManager alloc] init] ;
BOOL locationAllowed = [CLLocationManager locationServicesEnabled];
if (locationAllowed == NO){
//GPS DISABLED.
}
else{
if(IS_IOS8_OR_LATER){
[locationManager requestWhenInUseAuthorization];
[locationManager requestAlwaysAuthorization];
}
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
2) Declare MKCoordinateRegion In your viewController.h
MKCoordinateRegion region;
3) In didUpdateToLocation:
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSLog(#"current Latitude is %f",newLocation.coordinate.latitude);
NSLog(#"current Longitude is %f",newLocation.coordinate.longitude);
region.span.longitudeDelta *= 0.05;
region.span.latitudeDelta *= 0.05;
region.center.latitude = newLocation.coordinate.latitude;
region.center.longitude = newLocation.coordinate.longitude;
[self.mapView setRegion:region animated:YES];
[locationManager stopUpdatingLocation];
}

Answer 4

You can set latitudeDelta and longitudeDelta value to customised your zooming details. Increase means zoom and decrease means zoom out.

Answer 5

First in set showsUserLocation in viewDidLoad: like bellow..
mapView.showsUserLocation = YES;
and then in didUpdateToLocation: set Region with span with new location like bellow...
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
MKCoordinateRegion region;
region.center = newLocation.coordinate;
MKCoordinateSpan span;
span.latitudeDelta=0.04;
span.longitudeDelta=0.04;
region.span=span;
region.center = currentLocation;
[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region]; // Set `regionThatFits:` with `region` like bellow...
}

Answer 6

self.mapView.showsUserLocation = YES;
MKCoordinateRegion region;
region.center = self.mapView.userLocation.coordinate;
MKCoordinateSpan span;
span.latitudeDelta = 20;
span.longitudeDelta = 20;
region.span = span;
[self.realtorMapView setRegion:region animated:YES];