didSelect for MKAnnotationView not firing - ios

Question

I have troubles to make a custom annotation at a MapView selectable. I was trying several ways, without success:
Using didSelect of MKMapViewDelegate
Using a UIButton which is added to the AnnotationView
Using UITapGestureRecognizer for the ImageView, which should be used for the annotation
You can find all these approaches commented in the code below:
override func viewDidLoad() {
super.viewDidLoad()
// some more initialization code
for item in items {
let annotation = IdentifiedMKPointAnnotation() // has only one additional property named "id"
annotation.coordinate = CLLocationCoordinate2D(latitude: item.spots[0].latitude!, longitude: item.spots[0].longitude!)
annotation.id = i
self.mapView.addAnnotation(annotation)
i += 1
}
}
// MARK: - MapViewDelegate
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let item = self.items[(annotation as! IdentifiedMKPointAnnotation).id!]
let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "")
//annotationView.canShowCallout = false
//annotationView.isEnabled = false
let imageView = UIImageView()
imageView.frame.size = CGSize(width: 40, height: 40)
imageView.layer.cornerRadius = 20
imageView.layer.masksToBounds = true
imageView.af_setImage(withURL: URL(string: item.images.count > 0 ? item.images[0] : item.image!)!)
imageView.contentMode = .scaleAspectFill
//let gr = UIGestureRecognizer(target: self, action: #selector(annotationSelected(_:)))
//imageView.addGestureRecognizer(gr)
//imageView.isUserInteractionEnabled = true
//let button = UIButton()
//button.frame.size = CGSize(width: 40, height: 40)
//button.setImage(#imageLiteral(resourceName: "play_arrow"), for: .normal)
//button.addTarget(self, action: #selector(annotationSelected(_:)), for: .touchUpInside)
annotationView.addSubview(imageView)
//annotationView.addSubview(button)
return annotationView
}
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
performSegue(withIdentifier: "showDetail", sender: self.items[(view.annotation as! IdentifiedMKPointAnnotation).id!])
view.setSelected(false, animated: false)
}
func annotationSelected(_ sender: UIImageView) {
performSegue(withIdentifier: "showDetail", sender: self.items[((sender.superview as! MKAnnotationView).annotation as! IdentifiedMKPointAnnotation).id!])
}
Any ideas why the action(s) isn't/aren't firing?

Answer 1

If the annotation's title is blank, didSelect delegate is not called. Try the following code.
let annotation = IdentifiedMKPointAnnotation()
annotation.title = "title"

Answer 2

Just found the solution based on the following post: https://stackoverflow.com/a/28671680/6010489
It's enough to set height and width of the annotationview:
annotationView.frame.size.height = 40
annotationView.frame.size.width = 40

Answer 3

For some reason I had the same problem when mapView's delegate was set in Storyboard (Xcode 10.2, Swift 5.0). So this was not working:
However, when I removed the connection and did it in code instead it worked fine:
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self
}
A Swift 5 bug maybe? Storyboard solution works with Objective-C.