How to let user to add custom annotation? - swift

Question

I could not found any document, video or stackoverflow answer.
Here is my problem. I created map and add into my custom MKAnnotation and MKAnnotationView.
I want to let user to create custom pin and save to it's local via CoreData
MyCustomAnnotation has same attributes which is title, subtitle, and coordinate.
The first solution that I come up with put a button which creates a draggable pin to user location.
But I need to get less complex, more sophistication solution.
private func addPins() {
let list = PrivateLocations.shared.initLocations()
for pin in list {
map.addAnnotation(pin)
}
}
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
if view.annotation is MKUserLocation { return }
let views = Bundle.main.loadNibNamed("CustomCalloutView", owner: nil, options: nil)
let customView = views?[0] as! CustomCalloutView
customView.delegate = self
customView.isUserInteractionEnabled = true
customView.titleLabel.text = view.annotation?.title!
customView.desc.text = view.annotation?.subtitle!
customView.center = CGPoint(x: view.bounds.size.width / 2, y: -customView.bounds.size.height*0.52)
view.addSubview(customView)
map.setCenter((view.annotation?.coordinate)!, animated: true)
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if annotation is MKUserLocation {
return nil
} else {
let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "CustomAnnotationView")
annotationView.image = UIImage(named: "myImage")
annotationView.canShowCallout = false
return annotationView
}
}
And finally here is my CustomPin class :
var coordinate: CLLocationCoordinate2D
var title: String?
var subtitle: String?
init(_ title: String, _ subtitle: String, _ coordinate: CLLocationCoordinate2D) {
self.title = title
self.subtitle = subtitle
self.coordinate = coordinate
}

Answer 1

That's how I solve this problem,
1) Create a UIView for user show where he wants to add an annotation.
2) Add a pan gesture recognizer in it.
func addPanGesture(view: UIView) {
let pan = UIPanGestureRecognizer(target: self, action: #selector (self.handlePan(sender:)))
view.addGestureRecognizer(pan)
}
3) In my selector func, I call pinDropped() func
#objc func handlePan(sender: UIPanGestureRecognizer) {
let view = sender.view!
let translation = sender.translation(in: self.mapView)
switch sender.state {
case .began, .changed:
pinImage.center = CGPoint(x: dropPinImage.center.x + translation.x, y: dropPinImage.center.y + translation.y)
sender.setTranslation(CGPoint.zero, in: view)
break
default:
pinDropped()
break
}
}
4) I write what will be happening in my pinDropped func
func pinDropped() {
DispatchQueue.main.async {
let pin = CustomPin(self.lastOrigin, "pin")
self.mapView.addAnnotation(pin)
}
self.saveButton.alpha = 1
pinImage.alpha = 0
}