Getting coordinates from Firebase to make annotations - swift

Question

I am currently trying to get my data from firebase and create annotations in my MKMapKitView. I believe that I am retrieving the data properly but not creating the annotations properly.
I think that because there are multiple users I cannot just set it up as a regular way of annotating.
let userLocation = CLLocationCoordinate2D(latitude: Double(userLatitude!), longitude: Double(userLongitude!))
let userAnnotation = MKPointAnnotation();
userAnnotation.coordinate = self.userLocation!;
//userAnnotation.title = "Riders Location";
map.addAnnotation(userAnnotation);
}
I'll also add in how I am retrieving the users.
func retrieveUsers(){
let ref = Database.database().reference()
ref.child("users").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in
let users = snapshot.value as! [String: AnyObject]
self.user.removeAll()
for (_,value) in users {
if let uid = value["uid"] as? String {
if uid != Auth.auth().currentUser!.uid {
let userToShow = User()
if let fullName = value["full name"] as? String,
let userLongitude = value["long"] as? Double,
let userLatitude = value["lat"] as? Double
{
userToShow.fullName = value["full name"] as? String
userToShow.imagePath = value["urlToImage"] as? String
userToShow.userID = value["uid"] as? String
userToShow.userLongitude = value["long"] as? String
userToShow.userLatitude = value["lat"] as? String
self.user.append(userToShow)
}
}
}
}
DispatchQueue.main.async {
self.map.reloadInputViews()
//not sure if this is right
}
})
Thank you!!

Answer 1

It's a hunch, but I think you are after a function like this - you were pretty close with you effort! NB - no semicolons in swift syntax.
private func addUserAnnotation(user: User) {
let userAnnotation = MKPointAnnotation()
let userLocation = CLLocationCoordinate2D(latitude: Double(user.userLatitude!),
longitude: Double(user.userLongitude!))
userAnnotation.coordinate = userLocation
//userAnnotation.title = "Riders Location"
self.map.addAnnotation(userAnnotation)
}
Call the function like this - let's say you want to add annotation for just the first user from your user array:
addUserAnnotation(user: user[0]) //addUserAnnotation(user[0]) also acceptable
Here is the OP's class for the user. I think this is also important
class User: NSObject {
var userID: String!
var fullName: String!
var imagePath: String!
var userLongitude: Double! // change from String!
var userLatitude: Double! // change from String!
}