How to pass firebase data information to another viewcontroller when mapview annotation is clicked? - swift

Question

I know similar questions have been asked many times before. Just can't find one solution that fits my need. Please help
I have been trying to load information from firebase onto mapview. I am able to append all the information view map annotationviews. however what I want to do is pass the firebase data to a new viewcontroller when the map annotationviews are clicked. I am able to segue into another viewcontroller when clicking the annotations, but the wrong firebase data is loaded
Code I have tried thus far:
override func viewDidLoad() {
super.viewDidLoad()
self.mapView.delegate = self
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.requestLocation()
observeGeofire()
}
func observeGeofire() {
let dataRef = Database.database().reference().child("Shoutout")
dataRef.observeSingleEvent(of: .value, with: { (snapshot) in
for snap in snapshot.children {
let postSnap = snap as! DataSnapshot
if let dict = postSnap.value as? [String: AnyObject] {
let Lat = dict["lat"] as! CLLocationDegrees
let Long = dict["long"] as! CLLocationDegrees
let EVENT = dict["Event Type"] as? String
let Radmap = self.Rad
var annotations = MKPointAnnotation()
annotations.coordinate = CLLocationCoordinate2D(latitude: Lat, longitude: Long)
annotations.title = dict["title"] as? String
let loc = CLLocation(latitude: Lat, longitude: Long)
let distanceFromUser = (self.Location.distance(from: loc))/1000
let span = MKCoordinateSpanMake(0.25, 0.25)
if distanceFromUser < Radmap && EVENT! == self.sovcCET {
self.mapView.addAnnotation(annotations)
print("testing text for \(self.sovcCET)")
} else if distanceFromUser < Radmap && self.sovcCET == "All Events"{
self.mapView.addAnnotation(annotations)
} else if distanceFromUser < Radmap && self.sovcCET == "Choose Event" {
self.mapView.addAnnotation(annotations)
} else {
print("failed test")
}
}
}
})
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?{
if annotation is MKUserLocation {
//return nil so map view draws "blue dot" for standard user location
return nil
}
let reuseId = "pin"
var pinView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseId) as? MKPinAnnotationView
pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
pinView?.pinTintColor = UIColor.red
pinView?.canShowCallout = true
let smallSquare = CGSize(width: 30, height: 30)
let button = UIButton(frame: CGRect(origin: CGPoint(x: 0,y :0), size: smallSquare))
let rightButton = UIButton(type: .contactAdd)
rightButton.tag = annotation.hash
pinView?.animatesDrop = true
pinView?.canShowCallout = true
pinView?.rightCalloutAccessoryView = rightButton
pinView?.leftCalloutAccessoryView = button
return pinView
}
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView,
calloutAccessoryControlTapped control: UIControl) {
//mapToDetails
if control == view.rightCalloutAccessoryView {
performSegue(withIdentifier: "mapToDetails", sender: self)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "mapToDetails" {
if let destination = segue.destination as? shoutoutDetailViewController {
destination.shoutoutSelected = ShoutoutSelected
}
}
}
ShoutoutSelected is actually an instantiation of a class Shoutout containing multiple variable as shown below:
class Shoutout: NSObject {
// CLLocationDegrees
var event: String?
var when: String?
var Place: String?
var details: String?
var timestamp: NSNumber?
var whenTimeStamp: NSNumber?
var picsImageUrl: String?
var fromId: String?
var lat: CLLocationDegrees?
var long: CLLocationDegrees?
var title: String?
var subtitle: String?
var shoutoutId: String?
var distance: Double?
var tit: String?
var capt: String?
init(dictionary: [String: Any]) {
self.event = dictionary["Event Type"] as? String
self.when = dictionary["Date and Time"] as? String
self.whenTimeStamp = dictionary["Date and Time"] as? NSNumber
self.Place = dictionary["place"] as? String
self.details = dictionary["details"] as? String
self.timestamp = dictionary["TIMESTAMP"] as? NSNumber
self.picsImageUrl = dictionary["postPicUrl"] as? String
self.fromId = dictionary["FROM"] as? String
self.lat = dictionary["lat"] as? CLLocationDegrees
self.long = dictionary["long"] as? CLLocationDegrees
self.title = dictionary["title"] as? String
self.subtitle = dictionary["subtitle"] as? String
self.shoutoutId = dictionary ["ResponseID"] as? String
self.tit = dictionary ["Event Title"] as? String
self.capt = dictionary ["Captions"] as? String
}
func shouterPartnerId() -> String? {
return fromId
}
func soid() -> String? {
return shoutoutId
}
}
Thanks again

Answer 1

you can use below code instead of prepare segue
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView,
calloutAccessoryControlTapped control: UIControl) {
let vc = self.storyboard?.instantiateViewController(withIdentifier:
"DestinationViewController") as! DestinationViewController
vc.shoutoutSelected = ShoutoutSelected
self.navigationController?.pushViewController(vc, animated: true)
}

Answer 2

When using performSegue, performSegue(withIdentifier: "mapToDetails", sender: self) you can send your object in sender . So instead of sending sender : self try sender: ShoutoutSelected
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView,
calloutAccessoryControlTapped control: UIControl) {
//mapToDetails
if control == view.rightCalloutAccessoryView {
performSegue(withIdentifier: "mapToDetails", sender: ShoutOutSelected)
}
}
Now in prepareForSegue, you can retrieve the value of sender and pass it to the destination controller.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "mapToDetails" {
if let destination = segue.destination as? shoutoutDetailViewController {
destination.shoutoutSelected = sender as! Int // here sender = ShoutoutSelected, downcast it from Any to your desired type. I am considering destination.shoutoutSelected is of Int type.
}
}
}