Trouble creating custom MKAnnotationView - ios

Question

I'm having a hard time displaying a custom annotation view. Specifically, I'm trying to set an image named "pin" to be the new map pin. The default pin always shows. I've been making small changes for a few hours to no avail, such as changing "pin" to "pin.png" and altering the structure of the mapView:viewFor method. Here's what I have. Could you please take a look and see if anything stands out?
Thanks for any help!
Annotation Class:
class Annotation: NSObject, MKAnnotation {
dynamic var coordinate : CLLocationCoordinate2D
var title: String?
var subtitle: String?
init(location coord:CLLocationCoordinate2D) {
self.coordinate = coord
super.init()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
AnnotationView Class:
class AnnotationView : MKAnnotationView {
override init(annotation:MKAnnotation?, reuseIdentifier: String?) {
super.init(annotation: annotation,
reuseIdentifier: reuseIdentifier)
let im = UIImage(named: "pin")!
self.frame = CGRect(x: 0, y: 0, width: im.size.width / 3.0 + 5, height: im.size.height / 3.0 + 5)
self.centerOffset = CGPoint(x: 0, y: -20)
self.isOpaque = false
}
required init (coder: NSCoder) {
fatalError("NSCoding not supported")
}
override func draw(_ rect: CGRect) {
let im = UIImage(named: "pin")!
im.draw(in: self.bounds.insetBy(dx: 5, dy: 5))
}
}
mapView:viewFor: Method:
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
var v : MKAnnotationView! = nil
let ident = "pin"
v = mapView.dequeueReusableAnnotationView(withIdentifier: ident)
if v == nil {
v = AnnotationView(annotation: annotation, reuseIdentifier: ident)
v.canShowCallout = true
}
v.annotation = annotation
return v
}
Other Relevant Methods:
#IBAction func submitDog(_ sender: Any) {
let newDog = Dog(name: newDogName.text!, score: 11, picture: image!, location: location!)
dogs.append(newDog)
print(dogs.last!)
UIView.animate(withDuration: 0.5, animations: {
}) { _ in
self.newDogView.animation = "slideUp"
self.newDogView.animate()
self.newDogView.isHidden = true
self.newDogName.text = ""
self.map.isUserInteractionEnabled = true
}
dropNewPin(locatedAt: dogs.last!.location, name: dogs.last!.name, rate: dogs.last!.score)
}
func dropNewPin(locatedAt: CLLocation, name: String, rate: Int) {
let annotation = Annotation(location: CLLocationCoordinate2D(latitude: locatedAt.coordinate.latitude, longitude: locatedAt.coordinate.longitude))
annotation.title = name
annotation.subtitle = "\(rate)/10"
self.map.addAnnotation(annotation)
}

Answer 1

First you need add your viewController as delegate of your map
self.mapView.delegate = self
After that I recommend you use the MKAnnotationView instead of modify and add the image with custom drawing, if you need a custom Annotation view then you need to add a xib file and your custom class as file owner and make the proper adjustments
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
//to avoid make a custom Annotation view for your user location
if(annotation is MKUserLocation){
return nil
}
let ident = "pin"
var v = mapView.dequeueReusableAnnotationView(withIdentifier: ident)
if v == nil {
v = MKAnnotationView(annotation: annotation, reuseIdentifier: ident)
v?.image = UIImage(named: "pin")
v?.canShowCallout = true
}
v?.annotation = annotation
return v
}