iOS Firebase Snapshot.value

Question

I am trying to print my data from firebase into Xcode. However, I can never print the snapshot.value into my label (named as "polar"). Here is my code:

import UIKit
import FirebaseDatabase

class ViewController: UIViewController {


@IBOutlet var polar: UILabel!
var ref:DatabaseReference?
var databaseHandle:DatabaseHandle?
var postData = [String]()

override func viewDidLoad() {
    super.viewDidLoad()


    let ref = Database.database().reference()

    ref.child("Total gallons:").observe(.childAdded, with: { (snapshot) in

        let ionic = snapshot.value as? String
        self.polar.text = ionic

Why isn't my self.polar.text working? It should print my data onto the label, but it never shows up. Please help, thanks.

Data in my firebase database

Answer 1

You need to cast your snapshot as Dictionary first.

You could do:

guard let ionic = snapshot.value as? [String: Double] else { return }
print(ionic) // This will print snapshot. 
//You still need to add logic here to parse values from dictionary.

DispatchQueue.main.async {
     // Update UI elements here
}

self.polar.text = ionic

Answer 2

You could try this code:

ref.child("Total gallons").observe(.childAdded, with: { (snapshot) in
    if let ionic = snapshot.value as? [String: Double] {
        self.polar.text = ionic
    }
})

You should notice that "Total gallons" doesn't have ":" at the end. And ionic is a dictionary [String: Double], not a text.

Hope this helps.