[英]How do I zoom an MKMapView to the user's current location
我试图将mkmapview显示给用户当前位置。 他们将仅显示城市名称。 但是他们没有指定确切的用户当前位置。 我想显示用户的确切位置。 请让我知道如何缩放用户当前位置。
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);
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];
}
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];
}
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)在您的viewController.h中声明MKCoordinateRegion
MKCoordinateRegion地区;
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];
您可以设置latitudeDelta
和longitudeDelta
值来自定义缩放细节。 增大表示缩放,减小表示缩小。
在viewDidLoad:
首先显示showsUserLocation
viewDidLoad:
像下面这样。
mapView.showsUserLocation = YES;
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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