Add a pattern to a polygon | Maps SDK v6 | iOS

A newer version of the Maps SDK is available

This page uses v6.4.1 of the Mapbox Maps SDK. A newer version of the SDK is available. Learn about the latest version, v11.3.0, in the Maps SDK documentation.

The source data for this example originates from a tileset created through Mapbox Studio.

For more information about creating tilesets, see the Mapbox Studio manual.

ViewController

github View on GitHub

Swift

Objective-C

import Mapbox

class ViewController: UIViewController, MGLMapViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Set the map’s size, style, center coordinate, zoom level, and tint color.
        let mapView = MGLMapView(frame: view.bounds)
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        mapView.styleURL = MGLStyle.darkStyleURL(withVersion: 9)
        mapView.setCenter(CLLocationCoordinate2D(latitude: 38.849534447, longitude: -77.039222717), zoomLevel: 8.5, animated: false)
        mapView.tintColor = .lightGray

        view.addSubview(mapView)

        mapView.delegate = self
    }

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

        // Set the UIImage to be used for the fill pattern.
        let fillPatternImage = UIImage(named: "stripe-pattern")!

        // Add the fill pattern image to used by the style layer.
        style.setImage(fillPatternImage, forName: "stripe-pattern")

        // "mapbox://examples.0cd7imtl" is a map ID referencing a tileset containing vector data.
        // For more information, see mapbox.com/help/define-map-id/
        let source = MGLVectorTileSource(identifier: "drone-restrictions", configurationURL: URL(string: "mapbox://examples.0cd7imtl")!)
        style.addSource(source)

        // Create a style layer using the vector source.
        let layer = MGLFillStyleLayer(identifier: "drone-restrictions-style", source: source)

        // Set the source's identifier using the source name retrieved from its
        // TileJSON metadata: mapbox.com/api-documentation/maps/#retrieve-tilejson-metadata
        // You can also retrieve the source layer identifier in the Mapbox Studio layers list,
        // if your source data was added using the Mapbox Studio style editor.
         layer.sourceLayerIdentifier = "drone-restrictions-3f6lsg"

        // Set the fill pattern and opacity for the style layer. The NSExpression
        // object is a generic container for a style attribute value. In this case,
        // it is a reference to the fillPatternImage.
        layer.fillPattern = NSExpression(forConstantValue: "stripe-pattern")
        layer.fillOpacity = NSExpression(forConstantValue: 0.5)

        // Insert the pattern style layer below the layer contining city labels. If the
        // layer is not found, the style layer will be added above all other layers within the
        // Mapbox Dark style. NOTE: The "place-city-sm" layer is specific to the Mapbox Dark style.
        // Refer to the layers list in Mapbox Studio to confirm which layers are available for
        // use when working with a custom style.
        if let cityLabels = style.layer(withIdentifier: "place-city-sm") {
            style.insertLayer(layer, below: cityLabels)
        } else {
            style.addLayer(layer)
        }
    }
}