Other Constants

The font name string array expression used to format the text.

The font scale number expression relative to MGLSymbolStyleLayer.textFontSize used to format the text.

The font color expression used to format the text.

An NSUInteger constant used to indicate an invalid cluster identifier. This indicates a missing cluster feature.

An NSNumber object containing a Boolean value; specifies whether the shape of an MGLComputedShapeSource should be wrapped to accomodate coordinates with longitudes beyond −180 and 180. The default value is NO.

Setting this option to YES affects rendering performance.

This option is used with the MGLComputedShapeSource class; it is ignored when creating an MGLShapeSource object.

An NSNumber object containing a Boolean value; specifies whether the shape of an MGLComputedShapeSource should be clipped at the edge of each tile. The default value is NO.

Setting this option to YES affects rendering performance. Use this option to clip MGLPolylines and MGLPolygons at tile boundaries without artifacts.

This option is used with the MGLComputedShapeSource class; it is ignored when creating an MGLShapeSource object.

Posted by the shared MGLOfflineStorage object when an MGLOfflinePack object’s progress changes. The progress may change due to a resource being downloaded or because the pack discovers during the download that more resources are required for offline viewing. This notification is posted whenever any field in the progress property changes.

The object is the MGLOfflinePack object whose progress changed. The userInfo dictionary contains the pack’s current state in the MGLOfflinePackUserInfoKeyState key and details about the pack’s current progress in the MGLOfflinePackUserInfoKeyProgress key. You may also consult the MGLOfflinePack.state and MGLOfflinePack.progress properties, which provide the same values.

If you only need to observe changes in a particular pack’s progress, you can alternatively observe KVO change notifications to the pack’s progress key path.

Related examples

See the Download an offline map example to learn how to calculate the progress of an offline download.

Posted by the shared MGLOfflineStorage object whenever an MGLOfflinePack object encounters an error while downloading. The error may be recoverable and may not warrant the user’s attention. For example, the pack’s implementation may attempt to re-request failed resources based on an exponential backoff strategy or upon the restoration of network access.

The object is the MGLOfflinePack object that encountered the error. The userInfo dictionary contains the error object in the MGLOfflinePackUserInfoKeyError key.

Posted by the shared MGLOfflineStorage object when the maximum number of Mapbox-hosted tiles has been downloaded and stored on the current device.

The object is the MGLOfflinePack object that reached the tile limit in the course of downloading. The userInfo dictionary contains the tile limit in the MGLOfflinePackUserInfoKeyMaximumCount key.

Once this limit is reached, no instance of MGLOfflinePack can download additional tiles from Mapbox APIs until already downloaded tiles are removed by calling the -[MGLOfflineStorage removePack:withCompletionHandler:] method.

The key for an NSNumber object that indicates an offline pack’s current state. This key is used in the userInfo dictionary of an MGLOfflinePackProgressChangedNotification notification. Call -integerValue on the object to receive the MGLOfflinePackState-typed state.

The key for an NSValue object that indicates an offline pack’s current progress. This key is used in the userInfo dictionary of an MGLOfflinePackProgressChangedNotification notification. Call -MGLOfflinePackProgressValue on the object to receive the MGLOfflinePackProgress-typed progress.

The key for an NSError object that is encountered in the course of downloading an offline pack. This key is used in the userInfo dictionary of an MGLOfflinePackErrorNotification notification. The error’s domain is MGLErrorDomain. See MGLErrorCode for possible error codes.

The key for an NSNumber object that indicates the maximum number of Mapbox-hosted tiles that may be downloaded and stored on the current device. This key is used in the userInfo dictionary of an MGLOfflinePackMaximumMapboxTilesReachedNotification notification. Call -unsignedLongLongValue on the object to receive the uint64_t-typed tile limit.

An NSNumber object containing an unsigned integer that specifies the encoding formula for raster-dem tilesets. The integer corresponds to one of the constants described in MGLDEMEncoding.

The default value for this option is MGLDEMEncodingMapbox.

This option cannot be represented in a TileJSON or style JSON file. It is used with the MGLRasterDEMSource class and is ignored when creating an MGLRasterTileSource or MGLVectorTileSource object.

An NSNumber object containing a floating-point number that specifies the width and height (measured in points) at which the map displays each raster image tile when the map’s zoom level is an integer. The raster tile source scales its images up or down when the map’s zoom level falls between two integers.

The default value for this option is 512. Version 4 of the Mapbox Raster Tiles API requires a value of 256, as do many third-party tile servers, so consult your provider’s documentation for the correct value.

This option is only applicable to MGLRasterTileSource objects; it is ignored when initializing MGLVectorTileSource objects.

An NSNumber object containing a Boolean enabling or disabling clustering. If the shape property contains point shapes, setting this option to YES clusters the points by radius into groups. The default value is NO.

This option corresponds to the cluster source property in the Mapbox Style Specification.

This option only affects point features within an MGLShapeSource object; it is ignored when creating an MGLComputedShapeSource object.

Related examples

See the Cluster point data and Use images to cluster point data examples to learn how to cluster point data with this MGLShapeSourceOption.

An NSNumber object containing an integer; specifies the radius of each cluster if clustering is enabled. A value of 512 produces a radius equal to the width of a tile. The default value is 50.

This option only affects point features within an MGLShapeSource object; it is ignored when creating an MGLComputedShapeSource object.

An NSDictionary object where the key is an NSString. The dictionary key will be the feature attribute key. The resulting attribute value is aggregated from the clustered points. The dictionary value is an NSArray consisting of two NSExpression objects.

The first object determines how the attribute values are accumulated from the cluster points. It is an NSExpression with an expression function that accepts two or more arguments, such as sum or max. The arguments should be featureAccumulated and the previously defined feature attribute key. The resulting value is assigned to the specified attribute key.

The second NSExpression in the array determines which attribute values are accessed from individual features within a cluster.

let firstExpression = NSExpression(format: "sum:({$featureAccumulated, sumValue})")
let secondExpression = NSExpression(forKeyPath: "magnitude")
let clusterPropertiesDictionary = ["sumValue" : [firstExpression, secondExpression]]

let options : [MGLShapeSourceOption : Any] = [.clustered : true,
                                           .clusterProperties: clusterPropertiesDictionary]

This option corresponds to the clusterProperties source property in the Mapbox Style Specification.

This option only affects point features within an MGLShapeSource object; it is ignored when creating an MGLComputedShapeSource object.

An NSNumber object containing an integer; specifies the maximum zoom level at which to cluster points if clustering is enabled. Defaults to one zoom level less than the value of MGLShapeSourceOptionMaximumZoomLevel so that, at the maximum zoom level, the shapes are not clustered.

This option corresponds to the clusterMaxZoom source property in the Mapbox Style Specification.

This option only affects point features within an MGLShapeSource object; it is ignored when creating an MGLComputedShapeSource object.

An NSNumber object containing an integer; specifies the minimum zoom level at which to create vector tiles. The default value is 0.

This option corresponds to the minzoom source property in the Mapbox Style Specification.

An NSNumber object containing an integer; specifies the maximum zoom level at which to create vector tiles. A greater value produces greater detail at high zoom levels. The default value is 18.

This option corresponds to the maxzoom source property in the Mapbox Style Specification.

An NSNumber object containing an integer; specifies the size of the tile buffer on each side. A value of 0 produces no buffer. A value of 512 produces a buffer as wide as the tile itself. Larger values produce fewer rendering artifacts near tile edges and slower performance. The default value is 128.

This option corresponds to the buffer source property in the Mapbox Style Specification.

An NSNumber object containing a double; specifies the Douglas-Peucker simplification tolerance. A greater value produces simpler geometries and improves performance. The default value is 0.375.

This option corresponds to the tolerance source property in the Mapbox Style Specification.

An NSNumber object containing a Boolean enabling or disabling calculating line distance metrics.

Set this property to YES in order for the MGLLineStyleLayer.lineGradient property to have its intended effect. The default value is NO.

This option corresponds to the lineMetrics source property in the Mapbox Style Specification.

A version number identifying the default version of the Mapbox Streets style obtained through the MGLStyle.streetsStyleURL method. This version number may also be passed into the +[MGLStyle streetsStyleURLWithVersion:] method.

The value of this constant generally corresponds to the latest released version as of the date on which this SDK was published. You can use this constant to ascertain the style used by MGLMapView and MGLTilePyramidOfflineRegion when no style URL is specified. Consult the Mapbox Styles API documentation for the most up-to-date style versioning information.

An NSNumber object containing an unsigned integer that specifies the minimum zoom level at which to display tiles from the source.

The value should be between 0 and 22, inclusive, and less than MGLTileSourceOptionMaximumZoomLevel, if specified. The default value for this option is 0.

This option corresponds to the minzoom key in the TileJSON specification.

An NSNumber object containing an unsigned integer that specifies the maximum zoom level at which to display tiles from the source.

The value should be between 0 and 22, inclusive, and less than MGLTileSourceOptionMinimumZoomLevel, if specified. The default value for this option is 22.

This option corresponds to the maxzoom key in the TileJSON specification.

An NSValue object containing an MGLCoordinateBounds struct that specifies the geographic extent of the source.

If this option is specified, the SDK avoids requesting any tile that falls outside of the coordinate bounds. Otherwise, the SDK requests any tile needed to cover the viewport, as it does by default.

This option corresponds to the bounds key in the TileJSON specification.

An HTML string defining the buttons to be displayed in the map view’s attribution view when the source is part of the map view’s style.

By default, no attribution statements are displayed. If the MGLTileSourceOptionAttributionInfos option is specified, this option is ignored.

This option corresponds to the attribution key in the TileJSON specification.

An array of MGLAttributionInfo objects defining the buttons to be displayed in the map view’s attribution view when the source is part of the map view’s style.

By default, no attribution statements are displayed.

An NSNumber object containing an unsigned integer that specifies the tile coordinate system for the source’s tile URLs. The integer corresponds to one of the constants described in MGLTileCoordinateSystem.

The default value for this option is MGLTileCoordinateSystemXYZ.

This option corresponds to the scheme key in the TileJSON specification.

Indicates an error occurred in the Mapbox SDK.

An NSString identifying the linear interpolation type in an NSExpression.

This attribute corresponds to the linear value in the interpolate expression operator in the Mapbox Style Specification.

An NSString identifying the expotential interpolation type in an NSExpression.

This attribute corresponds to the exponential value in the interpolate expression operator in the Mapbox Style Specification.

An NSString identifying the cubic-bezier interpolation type in an NSExpression.

This attribute corresponds to the cubic-bezier value in the interpolate expression operator in the Mapbox Style Specification.

Project version number for Mapbox.

Project version string for Mapbox.