ios - 如何在 google sdk ios 中移动 gmsmapview 上的标记

Question

我想在纬度的基础上移动标记，我正在不断地做这件事，如下所示...

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations   (NSArray<CLLocation *> *)locations 
{

CLLocationCoordinate2D coor2D = CLLocationCoordinate2DMake(longitude, latitude);
    self.marker.position = coor2D;

}

该方法正在更新很长时间，但标记没有移动，为什么...在 info.plist 中我添加了..

Answer 1

假设您已经设置了委托(delegate)，请尝试此操作:

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations   (NSArray<CLLocation *> *)locations 
{

CLLocationCoordinate2D coor2D = CLLocationCoordinate2DMake(longitude, latitude);
    self.marker.position = coor2D;

[self.mapView animateToLocation:coord2D.coordinate]
}

如果您只想更新当前位置。您可能应该为此使用 KVO。

@implementation MyLocationViewController {
  GMSMapView *mapView_;
  BOOL firstLocationUpdate_;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-33.868
                                                          longitude:151.2086
                                                               zoom:12];

  mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera];
  mapView_.settings.compassButton = YES;
  mapView_.settings.myLocationButton = YES;

  // Listen to the myLocation property of GMSMapView.
  [mapView_ addObserver:self
             forKeyPath:@"myLocation"
                options:NSKeyValueObservingOptionNew
                context:NULL];

  self.view = mapView_;

  // Ask for My Location data after the map has already been added to the UI.
  dispatch_async(dispatch_get_main_queue(), ^{
    mapView_.myLocationEnabled = YES;
  });
}

- (void)dealloc {
  [mapView_ removeObserver:self
                forKeyPath:@"myLocation"
                   context:NULL];
}

#pragma mark - KVO updates

- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary *)change
                       context:(void *)context {
  if (!firstLocationUpdate_) {
    // If the first location update has not yet been recieved, then jump to that
    // location.
    firstLocationUpdate_ = YES;
    CLLocation *location = [change objectForKey:NSKeyValueChangeNewKey];
    mapView_.camera = [GMSCameraPosition cameraWithTarget:location.coordinate
                                                     zoom:14];
  }
}

@end