[英]How do I zoom an MKMapView to the user's current location
I am trying to show the mkmapview to the users current location. 我试图将mkmapview显示给用户当前位置。 They will display only city name.
他们将仅显示城市名称。 But they are not specify the exact users current location.
但是他们没有指定确切的用户当前位置。 I want to display the users exact location.
我想显示用户的确切位置。 Please give me any idea how to zoom the users current location.
请让我知道如何缩放用户当前位置。
GPSlocationAPPDelegate.m 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;
}
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);
Other option to get the user location is adding observer to mapview in viewDidLoad method like this 获取用户位置的另一个选项是在viewDidLoad方法中将观察者添加到mapview中,如下所示
-(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 每当观察者打电话时,只要这样做
- (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];
}
Steps: 1) In ViewWillAppear 步骤:1)在ViewWillAppear中
[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 2)在您的viewController.h中声明MKCoordinateRegion
MKCoordinateRegion region; MKCoordinateRegion地区;
3) In didUpdateToLocation: 3)在didUpdateToLocation中:
- (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];
}
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];
You can set latitudeDelta
and longitudeDelta
value to customised your zooming details. 您可以设置
latitudeDelta
和longitudeDelta
值来自定义缩放细节。 Increase means zoom and decrease means zoom out. 增大表示缩放,减小表示缩小。
First in set showsUserLocation
in viewDidLoad:
like bellow.. 在
viewDidLoad:
首先显示showsUserLocation
viewDidLoad:
像下面这样。
mapView.showsUserLocation = YES;
and then in didUpdateToLocation:
set Region with span with new location like bellow... 然后在
didUpdateToLocation:
将具有跨度的Region设置为新的位置,例如波纹管...
-(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...
}
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