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MGLMapViewDelegate

@protocol MGLMapViewDelegate <NSObject>

The MGLMapViewDelegate protocol defines a set of optional methods that you can use to receive map-related update messages. Because many map operations require the MGLMapView class to load data asynchronously, the map view calls these methods to notify your application when specific operations complete. The map view also uses these methods to request information about annotations displayed on the map, such as the styles and interaction modes to apply to individual annotations.

Responding to Map Position Changes

-mapView:shouldChangeFromCamera:toCamera:

Asks the delegate whether the map view should be allowed to change from the existing camera to the new camera in response to a user gesture.

This method is called as soon as the user gesture is recognized. It is not called in response to a programmatic camera change, such as by setting the centerCoordinate property or calling -flyToCamera:completionHandler:.

This method is called many times during gesturing, so you should avoid performing complex or performance-intensive tasks in your implementation.

Declaration

Objective-C

- (BOOL)mapView:(nonnull MGLMapView *)mapView
shouldChangeFromCamera:(nonnull MGLMapCamera *)oldCamera
              toCamera:(nonnull MGLMapCamera *)newCamera;

Swift

optional func mapView(_ mapView: MGLMapView, shouldChangeFrom oldCamera: MGLMapCamera, to newCamera: MGLMapCamera) -> Bool

Parameters

mapView

The map view that the user is manipulating.

oldCamera

The camera representing the viewpoint at the moment the gesture is recognized. If this method returns NO, the map view’s camera continues to be this camera.

newCamera

The expected camera after the gesture completes. If this method returns YES, this camera becomes the map view’s camera.

Return Value

A Boolean value indicating whether the map view should stay at oldCamera or change to newCamera.

-mapView:regionWillChangeAnimated:

Tells the delegate that the viewpoint depicted by the map view is about to change.

This method is called whenever the currently displayed map camera will start changing for any reason.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
regionWillChangeAnimated:(BOOL)animated;

Swift

optional func mapView(_ mapView: MGLMapView, regionWillChangeAnimated animated: Bool)

Parameters

mapView

The map view whose viewpoint will change.

animated

Whether the change will cause an animated effect on the map.

-mapViewRegionIsChanging:

Tells the delegate that the viewpoint depicted by the map view is changing.

This method is called as the currently displayed map camera changes as part of an animation, whether due to a user gesture or due to a call to a method such as -[MGLMapView setCamera:animated:]. This method can be called before -mapViewDidFinishLoadingMap: is called.

During the animation, this method may be called many times to report updates to the viewpoint. Therefore, your implementation of this method should be as lightweight as possible to avoid affecting performance.

Declaration

Objective-C

- (void)mapViewRegionIsChanging:(nonnull MGLMapView *)mapView;

Swift

optional func mapViewRegionIsChanging(_ mapView: MGLMapView)

Parameters

mapView

The map view whose viewpoint is changing.

-mapView:regionDidChangeAnimated:

Tells the delegate that the viewpoint depicted by the map view has finished changing.

This method is called whenever the currently displayed map camera has finished changing, after any calls to -mapViewRegionIsChanging: due to animation. Therefore, this method can be called before -mapViewDidFinishLoadingMap: is called.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
regionDidChangeAnimated:(BOOL)animated;

Swift

optional func mapView(_ mapView: MGLMapView, regionDidChangeAnimated animated: Bool)

Parameters

mapView

The map view whose viewpoint has changed.

animated

Whether the change caused an animated effect on the map.

Loading the Map

-mapViewWillStartLoadingMap:

Tells the delegate that the map view will begin to load.

This method is called whenever the map view starts loading, including when a new style has been set and the map must reload.

Declaration

Objective-C

- (void)mapViewWillStartLoadingMap:(nonnull MGLMapView *)mapView;

Swift

optional func mapViewWillStartLoadingMap(_ mapView: MGLMapView)

Parameters

mapView

The map view that is starting to load.

-mapViewDidFinishLoadingMap:

Tells the delegate that the map view has finished loading.

This method is called whenever the map view finishes loading, either after the initial load or after a style change has forced a reload.

Declaration

Objective-C

- (void)mapViewDidFinishLoadingMap:(nonnull MGLMapView *)mapView;

Swift

optional func mapViewDidFinishLoadingMap(_ mapView: MGLMapView)

Parameters

mapView

The map view that has finished loading.

-mapViewDidFailLoadingMap:withError:

Tells the delegate that the map view was unable to load data needed for displaying the map.

This method may be called for a variety of reasons, including a network connection failure or a failure to fetch the style from the server. You can use the given error message to notify the user that map data is unavailable.

Declaration

Objective-C

- (void)mapViewDidFailLoadingMap:(nonnull MGLMapView *)mapView
                   withError:(nonnull NSError *)error;

Swift

optional func mapViewDidFailLoadingMap(_ mapView: MGLMapView, withError error: Error)

Parameters

mapView

The map view that is unable to load the data.

error

The reason the data could not be loaded.

-mapViewWillStartRenderingFrame:

Tells the delegate that the map view is about to redraw.

This method is called any time the map view needs to redraw due to a change in the viewpoint or style property transition. This method may be called very frequently, even moreso than -mapViewRegionIsChanging:. Therefore, your implementation of this method should be as lightweight as possible to avoid affecting performance.

Declaration

Objective-C

- (void)mapViewWillStartRenderingFrame:(nonnull MGLMapView *)mapView;

Swift

optional func mapViewWillStartRenderingFrame(_ mapView: MGLMapView)

Parameters

mapView

The map view that is about to redraw.

-mapViewDidFinishRenderingFrame:fullyRendered:

Tells the delegate that the map view has just redrawn.

This method is called any time the map view needs to redraw due to a change in the viewpoint or style property transition. This method may be called very frequently, even moreso than -mapViewRegionIsChanging:. Therefore, your implementation of this method should be as lightweight as possible to avoid affecting performance.

Declaration

Objective-C

- (void)mapViewDidFinishRenderingFrame:(nonnull MGLMapView *)mapView
                     fullyRendered:(BOOL)fullyRendered;

Swift

optional func mapViewDidFinishRenderingFrame(_ mapView: MGLMapView, fullyRendered: Bool)

Parameters

mapView

The map view that has just redrawn.

-mapViewDidBecomeIdle:

Tells the delegate that the map view is entering an idle state, and no more drawing will be necessary until new data is loaded or there is some interaction with the map.

  • No camera transitions are in progress
  • All currently requested tiles have loaded
  • All fade/transition animations have completed

Declaration

Objective-C

- (void)mapViewDidBecomeIdle:(nonnull MGLMapView *)mapView;

Swift

optional func mapViewDidBecomeIdle(_ mapView: MGLMapView)

Parameters

mapView

The map view that has just entered the idle state.

-mapView:didFinishLoadingStyle:

Tells the delegate that the map has just finished loading a style.

This method is called during the initialization of the map view and after any subsequent loading of a new style. This method is called between the -mapViewWillStartRenderingMap: and -mapViewDidFinishRenderingMap: delegate methods. Changes to sources or layers of the current style do not cause this method to be called.

This method is the earliest opportunity to modify the layout or appearance of the current style before the map view is displayed to the user.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didFinishLoadingStyle:(nonnull MGLStyle *)style;

Swift

optional func mapView(_ mapView: MGLMapView, didFinishLoading style: MGLStyle)

Parameters

mapView

The map view that has just loaded a style.

style

The style that was loaded.

-mapView:shouldRemoveStyleImage:

Asks the delegate whether the map view should evict cached images.

This method is called in two scenarios: when the cumulative size of unused images exceeds the cache size or when the last tile that includes the image is removed from memory.

Declaration

Objective-C

- (BOOL)mapView:(nonnull MGLMapView *)mapView
shouldRemoveStyleImage:(nonnull NSString *)imageName;

Swift

optional func mapView(_ mapView: MGLMapView, shouldRemoveStyleImage imageName: String) -> Bool

Parameters

mapView

The map view that is evicting the image.

imageName

The image name that is going to be removed.

Return Value

A Boolean value indicating whether the map view should evict the cached image.

Tracking User Location

-mapViewWillStartLocatingUser:

Tells the delegate that the map view will begin tracking the user’s location.

This method is called when the value of the showsUserLocation property changes to YES.

Declaration

Objective-C

- (void)mapViewWillStartLocatingUser:(nonnull MGLMapView *)mapView;

Swift

optional func mapViewWillStartLocatingUser(_ mapView: MGLMapView)

Parameters

mapView

The map view that is tracking the user’s location.

-mapViewDidStopLocatingUser:

Tells the delegate that the map view has stopped tracking the user’s location.

This method is called when the value of the showsUserLocation property changes to NO.

Declaration

Objective-C

- (void)mapViewDidStopLocatingUser:(nonnull MGLMapView *)mapView;

Swift

optional func mapViewDidStopLocatingUser(_ mapView: MGLMapView)

Parameters

mapView

The map view that is tracking the user’s location.

-mapViewStyleForDefaultUserLocationAnnotationView:

Asks the delegate styling options for each default user location annotation view.

This method is called many times during gesturing, so you should avoid performing complex or performance-intensive tasks in your implementation.

Declaration

Objective-C

- (nonnull MGLUserLocationAnnotationViewStyle *)
mapViewStyleForDefaultUserLocationAnnotationView:
    (nonnull MGLMapView *)mapView;

Swift

optional func mapView(styleForDefaultUserLocationAnnotationView mapView: MGLMapView) -> MGLUserLocationAnnotationViewStyle

Parameters

mapView

The map view that is tracking the user’s location.

-mapView:didUpdateUserLocation:

Tells the delegate that the location of the user was updated.

While the showsUserLocation property is set to YES, this method is called whenever a new location update is received by the map view. This method is also called if the map view’s user tracking mode is set to MGLUserTrackingModeFollowWithHeading and the heading changes, or if it is set to MGLUserTrackingModeFollowWithCourse and the course changes.

This method is not called if the application is currently running in the background. If you want to receive location updates while running in the background, you must use the Core Location framework.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didUpdateUserLocation:(nullable MGLUserLocation *)userLocation;

Swift

optional func mapView(_ mapView: MGLMapView, didUpdate userLocation: MGLUserLocation?)

Parameters

mapView

The map view that is tracking the user’s location.

userLocation

The location object representing the user’s latest location. This property may be nil.

-mapView:didFailToLocateUserWithError:

Tells the delegate that an attempt to locate the user’s position failed.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didFailToLocateUserWithError:(nonnull NSError *)error;

Swift

optional func mapView(_ mapView: MGLMapView, didFailToLocateUserWithError error: Error)

Parameters

mapView

The map view that is tracking the user’s location.

error

An error object containing the reason why location tracking failed.

-mapView:didChangeUserTrackingMode:animated:

Tells the delegate that the map view’s user tracking mode has changed.

This method is called after the map view asynchronously changes to reflect the new user tracking mode, for example by beginning to zoom or rotate.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didChangeUserTrackingMode:(MGLUserTrackingMode)mode
                 animated:(BOOL)animated;

Swift

optional func mapView(_ mapView: MGLMapView, didChange mode: MGLUserTrackingMode, animated: Bool)

Parameters

mapView

The map view that changed its tracking mode.

mode

The new tracking mode.

animated

Whether the change caused an animated effect on the map.

-mapViewUserLocationAnchorPoint:

Returns a screen coordinate at which to position the user location annotation. This coordinate is relative to the map view’s origin after applying the map view’s content insets.

When unimplemented, the user location annotation is aligned within the center of the map view with respect to the content insets.

This method will override any values set by MGLMapView.userLocationVerticalAlignment or -[MGLMapView setUserLocationVerticalAlignment:animated:].

Declaration

Objective-C

- (CGPoint)mapViewUserLocationAnchorPoint:(nonnull MGLMapView *)mapView;

Swift

optional func mapViewUserLocationAnchorPoint(_ mapView: MGLMapView) -> CGPoint

Parameters

mapView

The map view that is tracking the user’s location.

-mapView:didChangeLocationManagerAuthorization:

Tells the delegate that the map’s location updates accuracy authorization has changed.

This method is called after the user changes location accuracy authorization when requesting location permissions or in privacy settings.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didChangeLocationManagerAuthorization:
    (nonnull id<MGLLocationManager>)manager;

Swift

optional func mapView(_ mapView: MGLMapView, didChangeLocationManagerAuthorization manager: MGLLocationManager)

Parameters

mapView

The map view that changed its location accuracy authorization.

manager

The location manager reporting the update.

Managing the Appearance of Annotations

-mapView:imageForAnnotation:

Returns an annotation image object to mark the given point annotation object on the map.

Implement this method to mark a point annotation with a static image. If you want to mark a particular point annotation with an annotation view instead, omit this method or have it return nil for that annotation, then implement -mapView:viewForAnnotation:.

Static annotation images use less memory and draw more quickly than annotation views. On the other hand, annotation views are compatible with UIKit, Core Animation, and other Cocoa Touch frameworks.

Declaration

Objective-C

- (nullable MGLAnnotationImage *)mapView:(nonnull MGLMapView *)mapView
                  imageForAnnotation:(nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, imageFor annotation: MGLAnnotation) -> MGLAnnotationImage?

Parameters

mapView

The map view that requested the annotation image.

annotation

The object representing the annotation that is about to be displayed.

Return Value

The annotation image object to display for the given annotation or nil if you want to display the default marker image or an annotation view.

-mapView:alphaForShapeAnnotation:

Returns the alpha value to use when rendering a shape annotation.

A value of 0.0 results in a completely transparent shape. A value of 1.0, the default, results in a completely opaque shape.

This method sets the opacity of an entire shape, inclusive of its stroke and fill. To independently set the values for stroke or fill, specify an alpha component in the color returned by -mapView:strokeColorForShapeAnnotation: or -mapView:fillColorForPolygonAnnotation:.

Declaration

Objective-C

- (CGFloat)mapView:(nonnull MGLMapView *)mapView
alphaForShapeAnnotation:(nonnull MGLShape *)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, alphaForShapeAnnotation annotation: MGLShape) -> CGFloat

Parameters

mapView

The map view rendering the shape annotation.

annotation

The annotation being rendered.

Return Value

An alpha value between 0 and 1.0.

-mapView:strokeColorForShapeAnnotation:

Returns the color to use when rendering the outline of a shape annotation.

The default stroke color is the map view’s tint color. If a pattern color is specified, the result is undefined.

Opacity may be set by specifying an alpha component. The default alpha value is 1.0 and results in a completely opaque stroke.

Declaration

Objective-C

- (nonnull UIColor *)mapView:(nonnull MGLMapView *)mapView
strokeColorForShapeAnnotation:(nonnull MGLShape *)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, strokeColorForShapeAnnotation annotation: MGLShape) -> UIColor

Parameters

mapView

The map view rendering the shape annotation.

annotation

The annotation being rendered.

Return Value

A color to use for the shape outline.

-mapView:fillColorForPolygonAnnotation:

Returns the color to use when rendering the fill of a polygon annotation.

The default fill color is the map view’s tint color. If a pattern color is specified, the result is undefined.

Opacity may be set by specifying an alpha component. The default alpha value is 1.0 and results in a completely opaque shape.

Declaration

Objective-C

- (nonnull UIColor *)mapView:(nonnull MGLMapView *)mapView
fillColorForPolygonAnnotation:(nonnull MGLPolygon *)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, fillColorForPolygonAnnotation annotation: MGLPolygon) -> UIColor

Parameters

mapView

The map view rendering the polygon annotation.

annotation

The annotation being rendered.

Return Value

The polygon’s interior fill color.

-mapView:lineWidthForPolylineAnnotation:

Returns the line width in points to use when rendering the outline of a polyline annotation.

By default, the polyline is outlined with a line 3.0 points wide.

Declaration

Objective-C

- (CGFloat)mapView:(nonnull MGLMapView *)mapView
lineWidthForPolylineAnnotation:(nonnull MGLPolyline *)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, lineWidthForPolylineAnnotation annotation: MGLPolyline) -> CGFloat

Parameters

mapView

The map view rendering the polygon annotation.

annotation

The annotation being rendered.

Return Value

A line width for the polyline, measured in points.

Managing Annotation Views

-mapView:viewForAnnotation:

Returns a view object to mark the given point annotation object on the map.

Implement this method to mark a point annotation with a view object. If you want to mark a particular point annotation with a static image instead, omit this method or have it return nil for that annotation, then implement -mapView:imageForAnnotation: instead.

Annotation views are compatible with UIKit, Core Animation, and other Cocoa Touch frameworks. On the other hand, static annotation images use less memory and draw more quickly than annotation views.

The user location annotation view can also be customized via this method. When annotation is an instance of MGLUserLocation (or equal to the map view’s userLocation property), return an instance of MGLUserLocationAnnotationView (or a subclass thereof).

Declaration

Objective-C

- (nullable MGLAnnotationView *)mapView:(nonnull MGLMapView *)mapView
                  viewForAnnotation:(nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, viewFor annotation: MGLAnnotation) -> MGLAnnotationView?

Parameters

mapView

The map view that requested the annotation view.

annotation

The object representing the annotation that is about to be displayed.

Return Value

The view object to display for the given annotation or nil if you want to display an annotation image instead.

-mapView:didAddAnnotationViews:

Tells the delegate that one or more annotation views have been added and positioned on the map.

This method is called just after the views are added to the map. You can implement this method to animate the addition of the annotation views.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didAddAnnotationViews:
    (nonnull NSArray<MGLAnnotationView *> *)annotationViews;

Swift

optional func mapView(_ mapView: MGLMapView, didAdd annotationViews: [MGLAnnotationView])

Parameters

mapView

The map view to which the annotation views were added.

annotationViews

An array of MGLAnnotationView objects representing the views that were added.

Selecting Annotations

-mapView:shapeAnnotationIsEnabled:

Returns a Boolean value indicating whether the shape annotation can be selected.

If the return value is YES, the user can select the annotation by tapping on it. If the delegate does not implement this method, the default value is YES.

Declaration

Objective-C

- (BOOL)mapView:(nonnull MGLMapView *)mapView
shapeAnnotationIsEnabled:(nonnull MGLShape *)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, shapeAnnotationIsEnabled annotation: MGLShape) -> Bool

Parameters

mapView

The map view that has selected the annotation.

annotation

The object representing the shape annotation.

Return Value

A Boolean value indicating whether the annotation can be selected.

-mapView:didSelectAnnotation:

Tells the delegate that one of its annotations was selected.

You can use this method to track changes in the selection state of annotations.

If the annotation is associated with an annotation view, you can also implement -mapView:didSelectAnnotationView:, which is called immediately after this method is called.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didSelectAnnotation:(nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, didSelect annotation: MGLAnnotation)

Parameters

mapView

The map view containing the annotation.

annotation

The annotation that was selected.

-mapView:didDeselectAnnotation:

Tells the delegate that one of its annotations was deselected.

You can use this method to track changes in the selection state of annotations.

If the annotation is associated with an annotation view, you can also implement -mapView:didDeselectAnnotationView:, which is called immediately after this method is called.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didDeselectAnnotation:(nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, didDeselect annotation: MGLAnnotation)

Parameters

mapView

The map view containing the annotation.

annotation

The annotation that was deselected.

-mapView:didSelectAnnotationView:

Tells the delegate that one of its annotation views was selected.

You can use this method to track changes in the selection state of annotation views.

This method is only called for annotation views. To track changes in the selection state of all annotations, including those associated with static annotation images, implement -mapView:didSelectAnnotation:, which is called immediately before this method is called.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didSelectAnnotationView:(nonnull MGLAnnotationView *)annotationView;

Swift

optional func mapView(_ mapView: MGLMapView, didSelect annotationView: MGLAnnotationView)

Parameters

mapView

The map view containing the annotation.

annotationView

The annotation view that was selected.

-mapView:didDeselectAnnotationView:

Tells the delegate that one of its annotation views was deselected.

You can use this method to track changes in the selection state of annotation views.

This method is only called for annotation views. To track changes in the selection state of all annotations, including those associated with static annotation images, implement -mapView:didDeselectAnnotation:, which is called immediately before this method is called.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
didDeselectAnnotationView:(nonnull MGLAnnotationView *)annotationView;

Swift

optional func mapView(_ mapView: MGLMapView, didDeselect annotationView: MGLAnnotationView)

Parameters

mapView

The map view containing the annotation.

annotationView

The annotation view that was deselected.

Managing Callout Views

-mapView:annotationCanShowCallout:

Returns a Boolean value indicating whether the annotation is able to display extra information in a callout bubble.

This method is called after an annotation is selected, before any callout is displayed for the annotation.

If the return value is YES, a callout view is shown when the user taps on an annotation, selecting it. The default callout displays the annotation’s title and subtitle. You can add accessory views to either end of the callout by implementing the -mapView:leftCalloutAccessoryViewForAnnotation: and -mapView:rightCalloutAccessoryViewForAnnotation: methods. You can further customize the callout’s contents by implementing the -mapView:calloutViewForAnnotation: method.

If the return value is NO, or if this method is absent from the delegate, or if the annotation lacks a title, the annotation will not show a callout even when selected.

Declaration

Objective-C

- (BOOL)mapView:(nonnull MGLMapView *)mapView
annotationCanShowCallout:(nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, annotationCanShowCallout annotation: MGLAnnotation) -> Bool

Parameters

mapView

The map view that has selected the annotation.

annotation

The object representing the annotation.

Return Value

A Boolean value indicating whether the annotation should show a callout.

-mapView:calloutViewForAnnotation:

Returns a callout view to display for the given annotation.

If this method is present in the delegate, it must return a new instance of a view dedicated to display the callout. The returned view will be configured by the map view.

If this method is absent from the delegate, or if it returns nil, a standard, two-line, bubble-like callout view is displayed by default.

Declaration

Objective-C

- (nullable id<MGLCalloutView>)mapView:(nonnull MGLMapView *)mapView
          calloutViewForAnnotation:(nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, calloutViewFor annotation: MGLAnnotation) -> MGLCalloutView?

Parameters

mapView

The map view that requested the callout view.

annotation

The object representing the annotation.

Return Value

A view conforming to the MGLCalloutView protocol, or nil to use the default callout view.

-mapView:leftCalloutAccessoryViewForAnnotation:

Returns the view to display on the left side of the standard callout bubble.

The left callout view is typically used to convey information about the annotation or to link to custom information provided by your application.

If the view you specify is a descendant of the UIControl class, you can use the map view’s delegate to receive notifications when your control is tapped, by implementing the -mapView:annotation:calloutAccessoryControlTapped: method. If the view you specify does not descend from UIControl, your view is responsible for handling any touch events within its bounds.

If this method is absent from the delegate, or if it returns nil, the standard callout view has no accessory view on its left side. The return value of this method is ignored if -mapView:calloutViewForAnnotation: is present in the delegate.

To display a view on the callout’s right side, implement the -mapView:rightCalloutAccessoryViewForAnnotation: method.

Declaration

Objective-C

- (nullable UIView *)mapView:(nonnull MGLMapView *)mapView
leftCalloutAccessoryViewForAnnotation:(nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, leftCalloutAccessoryViewFor annotation: MGLAnnotation) -> UIView?

Parameters

mapView

The map view presenting the annotation callout.

annotation

The object representing the annotation with the callout.

Return Value

The accessory view to display.

-mapView:rightCalloutAccessoryViewForAnnotation:

Returns the view to display on the right side of the standard callout bubble.

The right callout view is typically used to convey information about the annotation or to link to custom information provided by your application.

If the view you specify is a descendant of the UIControl class, you can use the map view’s delegate to receive notifications when your control is tapped, by implementing the -mapView:annotation:calloutAccessoryControlTapped: method. If the view you specify does not descend from UIControl, your view is responsible for handling any touch events within its bounds.

If this method is absent from the delegate, or if it returns nil, the standard callout view has no accessory view on its right side. The return value of this method is ignored if -mapView:calloutViewForAnnotation: is present in the delegate.

To display a view on the callout’s left side, implement the -mapView:leftCalloutAccessoryViewForAnnotation: method.

Declaration

Objective-C

- (nullable UIView *)mapView:(nonnull MGLMapView *)mapView
rightCalloutAccessoryViewForAnnotation:
    (nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, rightCalloutAccessoryViewFor annotation: MGLAnnotation) -> UIView?

Parameters

mapView

The map view presenting the annotation callout.

annotation

The object representing the annotation with the callout.

Return Value

The accessory view to display.

-mapView:annotation:calloutAccessoryControlTapped:

Tells the delegate that the user tapped one of the accessory controls in the annotation’s callout view.

In a standard callout view, accessory views contain custom content and are positioned on either side of the annotation title text. If an accessory view you specify is a descendant of the UIControl class, the map view calls this method as a convenience whenever the user taps your view. You can use this method to respond to taps and perform any actions associated with that control. For example, if your control displays additional information about the annotation, you could use this method to present a modal panel with that information.

If your custom accessory views are not descendants of the UIControl class, the map view does not call this method. If the annotation has a custom callout view via the -mapView:calloutViewForAnnotation: method, you can specify the custom accessory views using the MGLCalloutView protocol’s leftAccessoryView and rightAccessoryView properties.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
                   annotation:(nonnull id<MGLAnnotation>)annotation
calloutAccessoryControlTapped:(nonnull UIControl *)control;

Swift

optional func mapView(_ mapView: MGLMapView, annotation: MGLAnnotation, calloutAccessoryControlTapped control: UIControl)

Parameters

mapView

The map view containing the specified annotation.

annotation

The annotation whose accessory view was tapped.

control

The control that was tapped.

-mapView:tapOnCalloutForAnnotation:

Tells the delegate that the user tapped on an annotation’s callout view.

This method is called when the user taps on the body of the callout view, as opposed to the callout’s left or right accessory view. If the annotation has a custom callout view via the -mapView:calloutViewForAnnotation: method, this method is only called whenever the callout view calls its delegate’s -[MGLCalloutViewDelegate calloutViewTapped:] method.

If this method is present on the delegate, the standard callout view’s body momentarily highlights when the user taps it, whether or not this method does anything in response to the tap.

Declaration

Objective-C

- (void)mapView:(nonnull MGLMapView *)mapView
tapOnCalloutForAnnotation:(nonnull id<MGLAnnotation>)annotation;

Swift

optional func mapView(_ mapView: MGLMapView, tapOnCalloutFor annotation: MGLAnnotation)

Parameters

mapView

The map view containing the specified annotation.

annotation

The annotation whose callout was tapped.