I would like to do this like here: https://www.raywenderlich.com/7738344-mapkit-tutorial-getting-started
If you want to do things as shown in the tutorial, you need to instantiate a MKMapItem as instructed.
As you are using MKPointAnnotation, you can define an extension like this:
extension MKPointAnnotation {
var mapItem: MKMapItem {
let placemark = MKPlacemark(coordinate: self.coordinate)
return MKMapItem(placemark: placemark)
}
}
To utilized this extension, you may need to pass the right annotation (which needs to be an MKPointAnnotation) to didClickDetailDisclosureNavigation(button:).
Which may be hard using a usual UIButton. You should better define your own button type which can hold an annotation.
Not too complex:
class AnnotationButton: UIButton {
var annotation: MKPointAnnotation?
}
(Please do not put the extension and the class definition inside some other type. They need to be toplevel definitions.)
Your code would become something like this:
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
guard !(annotation is MKUserLocation) else { return nil }
//mapView.delegate = self //->Move this to `viewDidLoad()`
//This `annotationView` will be shadowed by the following `annotationView`, not used.
//let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: String(annotation.hash))
let identifier = "identifier"
//annotationView.canShowCallout = true
guard let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier, for: annotation) as? MKMarkerAnnotationView else { return nil }
//...
let leftButton = AnnotationButton(frame: CGRect( //<-
origin: .zero,
size: CGSize(width: 25, height: 25)))
leftButton.setBackgroundImage(#imageLiteral(resourceName: "nav"), for: .normal)
annotationView.leftCalloutAccessoryView = leftButton
leftButton.addTarget(self, action: #selector(didClickDetailDisclosureNavigation(button:)), for: .touchUpInside)
//↓↓
if let pointAnnotation = annotation as? MKPointAnnotation {
leftButton.annotation = pointAnnotation
}
//...
return annotationView
}
@objc func didClickDetailDisclosureNavigation(button: AnnotationButton) { //<-
let launchOptions = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
//↓↓
if let mapItem = button.annotation?.mapItem {
mapItem.openInMaps(launchOptions: launchOptions)
}
}
I haven't tried it myself (as you are not showing many parts of your code), but please try.
