ios - 放大到 map 上的当前位置

Question

我想在 map 上显示用户的当前位置并放大。

我试过如下:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        NSLog(@"Init MapViewController");
        [self initMap];
    }
    return self;
}


-(void) initMap
{
    _mapView = [[MKMapView alloc] initWithFrame:self.view.frame];

    _mapView.delegate = self;
    _mapView.showsUserLocation = YES;

    [self.view addSubview:_mapView];

    CLLocationCoordinate2D currentLocation;
    currentLocation.latitude = _mapView.userLocation.coordinate.latitude;
    currentLocation.longitude= _mapView.userLocation.coordinate.longitude;

    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(currentLocation, 0.5*METERS_PER_MILE, 0.5*METERS_PER_MILE);

    [_mapView setRegion:viewRegion animated:YES];
}

然后在模拟器中它显示了海中的一个位置。我在模拟器中将位置设置为伦敦。

Answer 1

只需这样做:

@property  (strong, nonatomic)   CLLocationManager *locationManager;

在viewdidload中:

self.locationManager = [[CLLocationManager alloc] init] ;
self.locationManager.delegate = (id)self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation ;
[self.locationManager setDistanceFilter:10.0f] ;
[self.locationManager startUpdatingLocation];

在您的位置管理器中

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation
       fromLocation:(CLLocation *)oldLocation
{
    [self.locationManager stopUpdatingLocation];
    CLLocationCoordinate2D zoomLocation;
    zoomLocation.latitude = YourMapView.userLocation.location.coordinate.latitude;
    zoomLocation.longitude= YourMapView.userLocation.location.coordinate.longitude;
    // 2
    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 0.5*1609.344, 0.5*1609.344);
    // 3
    [YourMapView setRegion:viewRegion animated:YES];
}