What does the snapshot/observer code do in firebase?

Question

When retrieving data from Firebase, we typically use the code below (or some reiteration of it)

...observeSingleEvent(of: .value, with: { snapshot in

var tempPo         


        

Answer 1

This code is used for observing data change in your database. You don't need to send requests from time to time for getting the latest data.

When the data changes, it will trigger the closure you given so that you can do things. For more reference, you could read this doc.

You could try this to covert snapshot into dictionary:

for child in snapshot.children {
    let dataS = child as! DataSnapshot
    let dict = dataS.value as? [String : AnyObject]
    // handle the data
}