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import Mapbox
@objc(SelectFeatureExample_Swift)
class SelectFeatureExample_Swift: UIViewController, MGLMapViewDelegate {
var mapView: MGLMapView!
var selectedFeaturesSource: MGLShapeSource?
override func viewDidLoad() {
super.viewDidLoad()
let mapView = MGLMapView(frame: view.bounds)
mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
mapView.setCenter(
CLLocationCoordinate2D(latitude: 45.5076, longitude: -122.6736),
zoomLevel: 11,
animated: false)
view.addSubview(mapView)
// Add our own gesture recognizer to handle taps on our custom map features.
mapView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(didTapMap(tapGestureRecognizer:))))
mapView.delegate = self
self.mapView = mapView
}
func mapView(_ didFinishLoadingmapView: MGLMapView, didFinishLoading style: MGLStyle) {
// Create a placeholder MGLShapeSource that will hold copies of any features we’ve selected.
let selectedFeaturesSource = MGLShapeSource(identifier: "selected-features", features: [], options: nil)
style.addSource(selectedFeaturesSource)
// Keep a reference to the source so we can update it when the map is tapped.
self.selectedFeaturesSource = selectedFeaturesSource
// Color any selected features red on the map.
let selectedFeaturesLayer = MGLFillStyleLayer(identifier: "selected-features", source: selectedFeaturesSource)
selectedFeaturesLayer.fillColor = MGLStyleValue(rawValue: UIColor.red)
style.addLayer(selectedFeaturesLayer)
}
func didTapMap(tapGestureRecognizer: UITapGestureRecognizer) {
if tapGestureRecognizer.state == .ended {
// A tap’s center coordinate may not intersect a feature exactly, so let’s make a 44x44 rect that represents a touch and select all features that intersect.
let point = tapGestureRecognizer.location(in: tapGestureRecognizer.view!)
let touchRect = CGRect(origin: point, size: .zero).insetBy(dx: -22.0, dy: -22.0)
// Let’s only select parks near the rect. There’s a layer within the Mapbox Streets style with "id" = "park". You can see all of the layers used within the default mapbox styles by creating a new style using Mapbox Studio.
let layerIdentifiers = Set(["park"])
// Query the map view for any visible features that intersect our rect.
let features = mapView.visibleFeatures(in: touchRect, styleLayerIdentifiers: layerIdentifiers).map { $0 as! MGLShape }
let shapes = MGLShapeCollectionFeature(shapes: features)
// Update our MGLShapeSource to match our selected features.
selectedFeaturesSource?.shape = shapes
}
}
}
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