MGLShapeOfflineRegion


@interface MGLShapeOfflineRegion
    : NSObject <MGLOfflineRegion, NSSecureCoding, NSCopying>

An offline region defined by a style URL, geographic shape, and range of zoom levels.

Example

var coordinates = [
    CLLocationCoordinate2D(latitude: 45.522585, longitude: -122.685699),
    CLLocationCoordinate2D(latitude: 45.534611, longitude: -122.708873),
    CLLocationCoordinate2D(latitude: 45.530883, longitude: -122.678833)
]

let triangle = MGLPolygon(coordinates: &coordinates, count: UInt(coordinates.count))
let region = MGLShapeOfflineRegion(styleURL: MGLStyle.lightStyleURL, shape: triangle, fromZoomLevel: 11, toZoomLevel: 14)
let context = "Triangle Region".data(using: .utf8)
MGLOfflineStorage.shared.addPack(for: region, withContext: context!)

This class requires fewer resources than MGLTilePyramidOfflineRegion for irregularly shaped regions.

shape
The shape for the geographic region covered by the downloaded tiles.
Declaration
Objective-C

@property (nonatomic, readonly) MGLShape *_Nonnull shape;
Swift

var shape: MGLShape { get }
View Source on GitHub
minimumZoomLevel
The minimum zoom level for which to download tiles and other resources.

For more information about zoom levels, -[MGLMapView zoomLevel].
Declaration
Objective-C

@property (nonatomic, readonly) double minimumZoomLevel;
Swift

var minimumZoomLevel: Double { get }
View Source on GitHub
maximumZoomLevel
The maximum zoom level for which to download tiles and other resources.

For more information about zoom levels, -[MGLMapView zoomLevel].
Declaration
Objective-C

@property (nonatomic, readonly) double maximumZoomLevel;
Swift

var maximumZoomLevel: Double { get }
View Source on GitHub


                    
                    
                    -initWithStyleURL:shape:fromZoomLevel:toZoomLevel:

Initializes a newly created offline region with the given style URL, geometry, and range of zoom levels.

This is the designated initializer for MGLShapeOfflineRegion.

Declaration

Objective-C

- (nonnull instancetype)initWithStyleURL:(nullable NSURL *)styleURL
                                   shape:(nonnull MGLShape *)shape
                           fromZoomLevel:(double)minimumZoomLevel
                             toZoomLevel:(double)maximumZoomLevel;

Swift

init(styleURL: URL?, shape: MGLShape, fromZoomLevel minimumZoomLevel: Double, toZoomLevel maximumZoomLevel: Double)

Parameters

`styleURL`	URL of the map style for which to download resources. The URL may be a full HTTP or HTTPS URL or a canonical URL. Specify `nil` for the default style. Relative file URLs cannot be used as offline style URLs. To download the online resources required by a local style, specify a URL to an online copy of the style.
`shape`	The shape of the geographic region to be covered by the downloaded tiles.
`minimumZoomLevel`	The minimum zoom level to be covered by the downloaded tiles. This parameter should be set to at least 0 but no greater than the value of the `maximumZoomLevel` parameter. For each required tile source, if this parameter is set to a value less than the tile source’s minimum zoom level, the download covers zoom levels down to the tile source’s minimum zoom level.
`maximumZoomLevel`	The maximum zoom level to be covered by the downloaded tiles. This parameter should be set to at least the value of the `minimumZoomLevel` parameter. For each required tile source, if this parameter is set to a value greater than the tile source’s minimum zoom level, the download covers zoom levels up to the tile source’s maximum zoom level.

View Source on GitHub