Mapbox iOS - Custom annotation didSelect not called

Question

I'm displaying custom annotations over the map and having hard times to receive didSelect calls on my delegate. Here is the code of the ViewController:

class TestAnnotationClickViewController: UIViewController, MGLMapViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        let mapView = MGLMapView(frame: view.bounds)
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        mapView.delegate = self

        mapView.addAnnotation(TestAnnotation())

        view.addSubview(mapView)
    }

    func mapView(_ mapView: MGLMapView, viewFor annotation: MGLAnnotation) -> MGLAnnotationView? {
        if annotation is TestAnnotation {
            let view = TestAnnotationView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
            return view
        }
        return nil
    }

    func mapView(_ mapView: MGLMapView, didSelect annotation: MGLAnnotation) {
        print("annotation didSelect")
    }

    func mapView(_ mapView: MGLMapView, didSelect annotationView: MGLAnnotationView) {
        print("annotation view didSelect")
    }
}

Here is the code for annotation class and corresponding view:

class TestAnnotation: NSObject, MGLAnnotation {

    var coordinate: CLLocationCoordinate2D

    override init() {
        coordinate = CLLocationCoordinate2D(latitude: 33.9415889, longitude: -118.4107187)
    }
}

class TestAnnotationView: MGLAnnotationView {

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setupView()
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupView()
    }

    private func setupView() {
        backgroundColor = .green
    }
}

When I'm pressing the annotation (green rectangle) I expect delegate methods didSelect to be called. However neither of them is invoked. And the console doesn't get "annotation didSelect" or "annotation view didSelect" printed.

I also tried to set isUserInteractionEnabled on the TestAnnotationView but it didn't help. What am I missing?

I install Mapbox (5.9.0) via cocoapods:

pod 'Mapbox-iOS-SDK', '~> 5.9'

Answer 1

I tend to use reuseIdentifiers for the creation of annotations and construct an init that carries that and the annotation through so for your use-case, something like:

func mapView(_ mapView: MGLMapView, viewFor annotation: MGLAnnotation) -> MGLAnnotationView? {
    if annotation is TestAnnotation {
        let view = TestAnnotationView(reuseIdentifier: "test", frame: CGRect(x: 0, y: 0, width: 100, height: 100), annotation: annotation)
        return view
    }
    return nil
}

and in the TestAnnotationViewClass adding the initialiser:

init(reuseIdentifier: String?, frame: CGRect, annotation: MGLAnnotation) {
    super.init(reuseIdentifier: reuseIdentifier)

    self.frame = frame
    setupView()
}

ensures that everything is setup so the annotations can respond to touches and trigger the didSelect delegate methods.