Query MGLPolyline added by MGLMapView.addAnnotation()

[nitrag]

Because DDS is not yet implemented, I can't import GeoJSON and have the SDK automatically style the polylines.

Instead, I parse the GeoJSON manually and create individual MGLPolyLine shapes and add it to the map:

self.mapView.addAnnotation(newPolyline)

Documentation does not say what layer this shape gets added to, if any.

I would like to be able to query the newly added polyline features during a tap gesture, like my other layers:

func mapTap(recognizer: UITapGestureRecognizer) {
    func squareFrom(location: CGPoint) -> CGRect {
        let length = 10.0
        return CGRect(x: Double(location.x - CGFloat(length / 2)), y: Double(location.y - CGFloat(length / 2)), width: length, height: length)
    }
    let location = recognizer.location(in: mapView)
    let touchableSquare = squareFrom(location: location)
    let features = mapView.visibleFeatures(in: touchableSquare, styleLayerIdentifiers: ["what-is-the-default-style?"])
    ....

iOS
3.4.0-beta7

[nitrag]

I should note that the generic/basic popup with the title (CalloutView?) is shown when MGLPointAnnotation is tapped, and so does this fire correctly:

func mapView(_ mapView: MGLMapView, didSelect annotationView: MGLAnnotationView) {
    print("Annotation selected")
}

but not for MGLPolyline, hence why I thought to use mapView.visibleFeatures()

[1ec5]

Documentation does not say what layer this shape gets added to, if any.

This is intentional; the layer identifier is an implementation detail that depends on the order in which the annotations are added.

what-is-the-default-style?

You can omit the styleLayerIdentifiers argument; by default, that method returns features in any layer that fall within the rect.

but not for MGLPolyline

This is covered by #2082. See that issue and #6505 for workarounds.

#6515 would help by providing a specialized gesture recognizer class to work with style layers.