CODEWITHSUNDEEP
iosswiftxcodefirebasefirebase-realtime-database
Code Beast
Code Beast

Reputation: 19

iOS Firebase Snapshot.value

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

Click here to see my data in my firebase database

Upvotes: 0

Views: 551

Answers (2)

qtngo
qtngo

Reputation: 1679

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.

Upvotes: 1

Bhaumik
Bhaumik

Reputation: 1238

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

Upvotes: 0

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