Firebase database setup and data handling in Swift 3 - swift

Question

I'm pretty new to swift and Firebase. I have database like this:
In the app I have multiple annotations and I need to pass the info from the database to them. At this point I got little bit confused with reading the data as dictionary and passing it to the annotations.
This was my previous code when I didn't use database and used Arrays:
for i in 0...2
{
let coordinate = coordinates[i]
let point = myAnnotation(coordinate: CLLocationCoordinate2D(latitude: coordinate[0] , longitude: coordinate[1] ))
point.name = names[i]
point.address = addresses[i]
point.hours = hours[i]
point.phones = phones[i]
self.mapView.addAnnotation(point)
}
You don't have to code it for me but I need at least some hint please.

Answer 1

I have a similar Database on my firebase, And I would do it like this:
FIRDatabase.database().reference().child("Data").observe(.value, with: {(snapshot) in
if let snapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
for snap in snapshot{
if let dict = snap.value as? [String: Any] {
if let address = dict["address"] as? String,let lat = dict["lat"] as? String, let long = dict["long"] as? String, let name = dict["name"] as? String {
let coordinate = coordinates[i]
let point = myAnnotation(coordinate: CLLocationCoordinate2D(latitude: lat , longitude: long ))
point.name = name
point.address = address
self.mapView.addAnnotation(point)
}
}
}
}
})
where I loop for each child of your Data node, pass that snap value as a dictionary, and then read the dictionary and type cast its values to see if format is correct to then assign it and append it to the array.