GoogleMaps Framework Reference

AI-generated Key Takeaways

• GMSGroundOverlay is used to display images on the Earth's surface, positioned explicitly and not facing the camera like markers.

• It is defined by its position, anchor, icon, opacity, bearing, and bounds.

• You can set the opacity for transparency and bearing for rotation.

• Convenience constructors help create ground overlays with bounds and icons or position, icon, and zoom level.

GMSGroundOverlay

@interface GMSGroundOverlay : GMSOverlay

GMSGroundOverlay specifies the available options for a ground overlay that exists on the Earth’s surface. Unlike a marker, the position of a ground overlay is specified explicitly and it does not face the camera.

• position

  The position of this GMSGroundOverlay, or more specifically, the physical position of its anchor. If this is changed, bounds will be moved around the new position.

  Declaration

  Swift

  var position: CLLocationCoordinate2D { get set }

  Objective-C

  @property (nonatomic) CLLocationCoordinate2D position;

• anchor

  The anchor specifies where this GMSGroundOverlay is anchored to the Earth in relation to bounds. If this is modified, position will be set to the corresponding new position within bounds.

  Declaration

  Swift

  var anchor: CGPoint { get set }

  Objective-C

  @property (nonatomic) CGPoint anchor;

• icon

  Icon to render within bounds on the Earth. If this is nil, the overlay will not be visible (unlike GMSMarker which has a default image).

  Declaration

  Swift

  var icon: UIImage? { get set }

  Objective-C

  @property (nonatomic, nullable) UIImage *icon;

• opacity

  Sets the opacity of the ground overlay, between 0 (completely transparent) and 1 (default) inclusive.

  Declaration

  Swift

  var opacity: Float { get set }

  Objective-C

  @property (nonatomic) float opacity;

• bearing

  Bearing of this ground overlay, in degrees. The default value, zero, points this ground overlay up/down along the normal Y axis of the earth.

  Declaration

  Swift

  var bearing: CLLocationDirection { get set }

  Objective-C

  @property (nonatomic) CLLocationDirection bearing;

• bounds

  The 2D bounds on the Earth in which icon is drawn. Changing this value will adjust position accordingly.

  Declaration

  Swift

  var bounds: GMSCoordinateBounds? { get set }

  Objective-C

  @property (nonatomic, nullable) GMSCoordinateBounds *bounds;

• +groundOverlayWithBounds:icon:

  Convenience constructor for GMSGroundOverlay for a particular bounds and icon. Will set position accordingly.

  Declaration

  Swift

  convenience init(bounds: GMSCoordinateBounds?, icon: UIImage?)

  Objective-C

  + (nonnull instancetype)groundOverlayWithBounds:
                              (nullable GMSCoordinateBounds *)bounds
                                             icon:(nullable UIImage *)icon;

• +groundOverlayWithPosition:icon:zoomLevel:

  Constructs a GMSGroundOverlay that renders the given icon at position, as if the image’s actual size matches camera pixels at zoomLevel.

  Declaration

  Swift

  convenience init(position: CLLocationCoordinate2D, icon: UIImage?, zoomLevel: CGFloat)

  Objective-C

  + (nonnull instancetype)groundOverlayWithPosition:
                              (CLLocationCoordinate2D)position
                                               icon:(nullable UIImage *)icon
                                          zoomLevel:(CGFloat)zoomLevel;